Photometry: Measurement of the various properties of light.Telescopes: Instruments used to observe distant objects.Antarctic Regions: The continent lying around the South Pole and the southern waters of the Atlantic, Pacific, and Indian Oceans. It includes the Falkland Islands Dependencies. (From Webster's New Geographical Dictionary, 1988, p55)Seasons: Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Image Processing, Computer-Assisted: A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.Journal ArticleSensory Aids: Devices that help people with impaired sensory responses.Astronomical Processes: The behavior and interactions of matter and energy in outer space.Eyeglasses: A pair of ophthalmic lenses in a frame or mounting which is supported by the nose and ears. The purpose is to aid or improve vision. It does not include goggles or nonprescription sun glasses for which EYE PROTECTIVE DEVICES is available.MuseumsMarylandBaltimoreVisitors to Patients: Patients' guests and rules for visiting.History, 19th Century: Time period from 1801 through 1900 of the common era.History, 18th Century: Time period from 1701 through 1800 of the common era.History, 20th Century: Time period from 1901 through 2000 of the common era.Lipectomy: Removal of localized SUBCUTANEOUS FAT deposits by SUCTION CURETTAGE or blunt CANNULATION in the cosmetic correction of OBESITY and other esthetic contour defects.History, 17th Century: Time period from 1601 through 1700 of the common era.Societies, Medical: Societies whose membership is limited to physicians.GreenlandExpeditions: Usually refers to planned scientific data-gathering excursions.Ursidae: The family of carnivorous or omnivorous bears, having massive bodies, coarse heavy fur, relatively short limbs, and almost rudimentary tails.North AmericaHydrocarbons, HalogenatedAnthropology, Cultural: It is the study of social phenomena which characterize the learned, shared, and transmitted social activities of particular ethnic groups with focus on the causes, consequences, and complexities of human social and cultural variability.Beauty: Characteristics or attributes of persons or things which elicit pleasurable feelings.Anthropology, Medical: Field of social science that is concerned with differences between human groups as related to health status and beliefs.Altitude Sickness: Multiple symptoms associated with reduced oxygen at high ALTITUDE.Mountaineering: A sport involving mountain climbing techniques.Nunavut: A self-governing territory formed from the central and eastern portions of the Northwest Territories. It was officially established April 1, 1999. The capital is Iqaluit.Arctic Regions: The Arctic Ocean and the lands in it and adjacent to it. It includes Point Barrow, Alaska, most of the Franklin District in Canada, two thirds of Greenland, Svalbard, Franz Josef Land, Lapland, Novaya Zemlya, and Northern Siberia. (Webster's New Geographical Dictionary, 1988, p66)Climate Change: Any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). It may result from natural factors such as changes in the sun's intensity, natural processes within the climate system such as changes in ocean circulation, or human activities.Climate: The longterm manifestations of WEATHER. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Human Rights: The rights of the individual to cultural, social, economic, and educational opportunities as provided by society, e.g., right to work, right to education, and right to social security.Greenhouse Effect: The effect of GLOBAL WARMING and the resulting increase in world temperatures. The predicted health effects of such long-term climatic change include increased incidence of respiratory, water-borne, and vector-borne diseases.Health Impact Assessment: Combination of procedures, methods, and tools by which a policy, program, or project may be judged as to its potential effects on the health of a population, and the distribution of those effects within the population.Ice Cover: A thick mass of ICE formed over large regions of land; RIVERS; LAKES; ponds; or SEAWATER.Ecosystem: A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)Geology: The science of the earth and other celestial bodies and their history as recorded in the rocks. It includes the study of geologic processes of an area such as rock formations, weathering and erosion, and sedimentation. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Petroleum: Naturally occurring complex liquid hydrocarbons which, after distillation, yield combustible fuels, petrochemicals, and lubricants.Anniversaries and Special Events: Occasions to commemorate an event or occasions designated for a specific purpose.Geological Phenomena: The inanimate matter of Earth, the structures and properties of this matter, and the processes that affect it.Editorial Policies: The guidelines and policy statements set forth by the editor(s) or editorial board of a publication.History, 21st Century: Time period from 2001 through 2100 of the common era.Volcanic Eruptions: The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)BooksBook SelectionBook Reviews as Topic: Critical analyses of books or other monographic works.Rare BooksBook PricesReference Books, Medical: Books in the field of medicine intended primarily for consultation.Books, Illustrated: Books containing photographs, prints, drawings, portraits, plates, diagrams, facsimiles, maps, tables, or other representations or systematic arrangement of data designed to elucidate or decorate its contents. (From The ALA Glossary of Library and Information Science, 1983, p114)Reference Books: Books designed by the arrangement and treatment of their subject matter to be consulted for definite terms of information rather than to be read consecutively. Reference books include DICTIONARIES; ENCYCLOPEDIAS; ATLASES; etc. (From the ALA Glossary of Library and Information Science, 1983)Great BritainBook CollectingIce: The solid substance formed by the FREEZING of water.Foraminifera: An order of amoeboid EUKARYOTES characterized by reticulating pseudopods and a complex life cycle with an alternation of generations. Most are less than 1mm in size and found in marine or brackish water.Radar: A system using beamed and reflected radio signals to and from an object in such a way that range, bearing, and other characteristics of the object may be determined.Oceanography: The science that deals with the ocean and its phenomena. (Webster, 3d ed)Mars: The fourth planet in order from the sun. Its two natural satellites are Deimos and Phobos. It is one of the four inner or terrestrial planets of the solar system.History, Medieval: The period of history from the year 500 through 1450 of the common era.Extraterrestrial Environment: The environment outside the earth or its atmosphere. The environment may refer to a closed cabin (such as a space shuttle or space station) or to space itself, the moon, or other planets.HumanitiesChemical Hazard Release: Uncontrolled release of a chemical from its containment that either threatens to, or does, cause exposure to a chemical hazard. Such an incident may occur accidentally or deliberately.Love: Affection; in psychiatry commonly refers to pleasure, particularly as it applies to gratifying experiences between individuals.Dent Disease: X-linked recessive NEPHROLITHIASIS characterized by HYPERCALCIURIA; HYPOPHOSPHATEMIA; NEPHROCALCINOSIS; and PROTEINURIA. It is associated with mutations in the voltage-gated chloride channel, CLC-5 (Dent Disease I). Another group of mutations associated with this disease is in phosphatidylinositol 4,5-bisphosphate-5-phosphatase gene.Voice: The sounds produced by humans by the passage of air through the LARYNX and over the VOCAL CORDS, and then modified by the resonance organs, the NASOPHARYNX, and the MOUTH.Snow: Frozen water crystals that fall from the ATMOSPHERE.Voice Disorders: Pathological processes that affect voice production, usually involving VOCAL CORDS and the LARYNGEAL MUCOSA. Voice disorders can be caused by organic (anatomical), or functional (emotional or psychological) factors leading to DYSPHONIA; APHONIA; and defects in VOICE QUALITY, loudness, and pitch.Fuel Oils: Complex petroleum hydrocarbons consisting mainly of residues from crude oil distillation. These liquid products include heating oils, stove oils, and furnace oils and are burned to generate energy.

Bulbus arteriosus of the antarctic teleosts. I. The white-blooded Chionodraco hamatus. (1/765)

The bulbus arteriosus of teleost fish is a thick-walled chamber that extends between the single ventricle and the ventral aorta. The functional importance of the bulbus resides in the fact that it maintains a steady blood flow into the gill system through heart contraction. Despite of this, a thorough study of the structure of the bulbus in teleost fish is still lacking. We have undertaken a morphologic study of the bulbus arteriosus in the stenothermal teleosts of the Antarctic sea. The structural organization of the bulbus arteriosus of the icefish Chionodraco hamatus has been studied here by conventional light, scanning, and transmission electron microscopy. The inner surface of the bulbus shows a festooned appearance due to the presence of longitudinal, unbranched ridges that extend between the ventricle and the arterial trunk. The wall of the bulbus is divided into endocardial, subendocardial, middle, and external layers. Endocardial cells show a large number of moderately-dense bodies. The endocardium invaginates into the subendocardium forming solid epithelial cords that contain numerous secretory vacuoles. Cells in the subendocardium group into small domains, have some of the morphological characteristics of smooth muscle cells, and appear enmeshed in a three-dimensional network of matrix filaments. Cells in the middle layer are typical smooth muscle cells. They appear arranged into layers and are surrounded by a filamentous meshwork that excludes collagen fibers. Orientation of this meshwork occurs in the vicinity of the smooth muscle cells. Elastin fibers are never observed. The external layer is formed by wavy collagen bundles and fibroblast-like cells. This layer lacks blood vessels and nerve fibers. The endocardium and the endocardium-derived cords are secretory epithelia that may be involved in the formation ofmucins or glycosaminoglycans. These mucins may have a protecting effect on the endocardium. The subendocardium and the middle layer appear to be formed by the same cell type, smooth muscle, with a gradient of differentiation from the secretory (subendocardium) to the contractile (middle layer) phenotype. Despite the absence of elastin fibers, the filamentous matrix could maintain the elastic properties of the bulbus wall. Smooth muscle cells appear to be actively involved in bulbus wall dynamics. The restriction of collagen to the external layer suggests that it may control wall dilatation and bulbus compliance. When comparison was possible, structural differences between C. hamatus and temperate teleosts seemed to be not species-related, but of phenotypic adaptative significance. This is remarkable since Antarctic fishes have lived isolated in freezing waters for the last two million years.  (+info)

Prolonged eradication of urogenital mycoplasmas after administration of tetracycline to men in the Antarctic. (2/765)

Meatal swabs were obtained at intervals over 1 year from 23 men in the Antarctic. A 5-day course of tetracycline was given to twelve of them. In retrospect it was found that the antibiotic had been received by two men who were harbouring ureaplasmas, one of whom also had M. hominis. After treatment, these organisms were not found in any of the swabs taken over the next year, except in a swab from one of the men following sexual contact after this time. One of the twelve men developed N.S.U. just before arriving in the Antarctic. He responded clinically to a shorter course of tetracycline and ureplasmas were not recovered from a meatal swab immediately thereafter. However, without further sexual contact, ureaplasmas and disease recurred about a month later. This time, after a 5-day course of tetracycline, disease was not seen, and ureaplasmas were not isolated, over the next year. In contrast, ureaplasmas were isolated consistently over a year from two men who were not given the antibiotic. The evidence strongly suggests that, under natural conditions, the most likely cause of mycoplasmas, particularly ureaplasmas, recurring in the genital tract after apparently adequate tetracycline therapy, is re-infection as a result of sexual re-exposure.  (+info)

A RNA polymerase with transcriptional activity at 0 degrees C from the Antarctic bacterium Pseudomonas syringae. (3/765)

A DNA-dependent RNA polymerase was purified from the Antarctic psychrotrophic bacterium Pseudomonas syringae. The RNA polymerase showed a typical eubacterial subunit composition with beta, beta', alpha2 and sigma subunits. The subunits cross-reacted with antibodies raised against holoenzyme and the individual subunits of the RNA polymerase of Escherichia coli. However, the enzyme was considered unique, since unlike the RNA polymerase of mesophilic E. coli it exhibited significant and consistent transcriptional activity (10-15%) even at 0 degrees C. But, similar to the enzyme from the mesophilic bacterium, the RNA polymerase from P. syringae exhibited optimum activity at 37 degrees C. The study also demonstrates that the RNA polymerase of P. syringae could preferentially transcribe the cold-inducible gene cspA of E. coli only at lower temperatures (0-22 degrees C). The polymerase was also observed to be relatively more rifampicin-resistant during transcription at lower temperature.  (+info)

Metallothioneins in antarctic fish: evidence for independent duplication and gene conversion. (4/765)

In the present paper, we examine eight species of Antarctic fish belonging to the suborder Notothenioidei, using reverse-transcriptase polymerase chain reaction, to investigate the presence of mRNAs encoding metallothionein (MT) isoforms. A total of 168 bp from the coding region and the complete (133-165 bp) 3' untranslated region (UTR) was obtained for all species (for three of them, we also sequenced the full-length cDNA, including the 5' UTR). Phylogenetic analyses carried out on the MT-coding region suggest monophyly for Antarctic fish MTs with respect to other teleost MT genes. Analyses also revealed that notothenioid MTs can be divided into at least two groups of paralogy, MT-1 and MT-2. These results indicate that notothenioid MT isoforms arose from at least one gene duplication event occurring in the ancestral lineage of the Notothenioidei. This duplication occurred independent of the one which gave origin to two metallothionein isoforms in the rainbow trout. In addition, an instance of gene conversion was observed between MT-1 and MT-2 genes in Notothenia coriiceps. Analyses of the 5' UTR, combined with quantitative assay of differential expression of MT-1 and MT-2, indicate that only the 3' UTR underwent a gene conversion event in the mentioned species. These findings, together with the observation of a differential pattern of expression for the two MT isoforms, disclose an unexpected complexity in the evolution and function of notothenioid MTs; as in most teleost species examined (apart from the rainbow trout), a single MT form is present.  (+info)

Determination of the solution structure of the N-domain plus linker of Antarctic eel pout antifreeze protein RD3. (5/765)

RD3, a new antifreeze protein (AFP) extracted from antarctic eel pout is a single polypeptide divided into homologous N-terminal (residues Asn(1)-Glu(64)) and C-terminal (residues Ser(74)-Glu(134)) domains, each of which has a high sequence identity with Type III AFP. A 9-residue linker (-D(65)GTTSPGLK(73)-) connects these two domains in tandem and is thought to play a significant role in defining the nature of the intact molecule. The present paper shows for the first time the solution structure and preliminary (15)N-NMR backbone dynamics data of the N-domain plus the linker of recombinant RD3 protein (RD3-Nl: residues 1-73) by employing homo- and heteronuclear multidimensional NMR spectroscopy. Forty converged structures of RD3-Nl were successfully calculated by using a total of 958 NMR-derived structural restraints. It was found that the N-domain of RD3-Nl has a globular form comprising six beta-strands, three type III turns, and several loops, which stabilize a flat, ice-binding site formed on one side of this domain. Further, the linker portion appears to have a definitive structure, which is independent of the globular N-domain. This definitive linker is roughly divided into two short strands, -D(65)GTTSP(70)- and -G(71)LK(73)-, which are bent around -T(67)TSPG(71)- at an angle of approximately 60 degrees. This bending motif of the linker may function to orient the two ice-binding sites of the N- and C-domains of RD3 in the same direction, leading to their simultaneous interactions with the ice crystal surface.  (+info)

Physicochemical parameters for growth of the sea ice bacteria Glaciecola punicea ACAM 611(T) and Gelidibacter sp. strain IC158. (6/765)

The water activity and pH ranges for growth of Glaciecola punicea (a psychrophile) were extended when this organism was grown at suboptimal rather than optimal temperatures. No such extension was observed for Gelidibacter sp. strain IC158 (a psychrotolerant bacterium) at analogous temperatures. Salinity and pH may be primary physicochemical parameters controlling bacterial community development in sea ice.  (+info)

Temperature-dependent expression of cytochrome-c oxidase in Antarctic and temperate fish. (7/765)

Seasonal acclimation versus permanent adaptation to low temperatures leads to a differential response in the expression of cytochrome-c oxidase (CCO) in temperate and Antarctic eelpouts. Although eurythermal eelpout from the North Sea (Zoarces viviparus) displayed a cold-induced rise of CCO activity in white muscle, enzyme activity in the cold stenothermal Antarctic eelpout Pachycara brachycephalum failed to reflect such a compensatory increase. In Antarctic eelpout, CCO activity correlates with transcript levels of mitochondrial encoded subunits of CCO (CCO I and CCO II), whereas cold-acclimated eelpout from the North Sea show lower enzyme activities than expected on the basis of mitochondrial mRNA levels. In these animals, CCO expression at low temperatures may be limited either by nuclear CCO transcripts or by posttranscriptional processes. These may comprise translation of the subunits or assembly of the CCO holoenzyme. mRNA levels of CCO IV, one of the nuclear encoded subunits, increased strongly during cold acclimation, indicating that the expression of CCO is likely not message limited in cold-acclimated Z. viviparus. Our data suggest that seasonal cold acclimation of Z. viviparus results in a modification of the relationship between transcription and translation or posttranslational processes. In permanently cold-adapted P. brachycephalum, on the other hand, CCO expression shows similar characteristics as in the warm-acclimated confamilial species, e.g., low levels of enzyme activity correlated with low levels of mitochondrial message.  (+info)

Cold-adapted alanine dehydrogenases from two antarctic bacterial strains: gene cloning, protein characterization, and comparison with mesophilic and thermophilic counterparts. (8/765)

The genes encoding NAD(+)-dependent alanine dehydrogenases (AlaDHs) (EC 1.4.1.1) from the Antarctic bacterial organisms Shewanella sp. strain Ac10 (SheAlaDH) and Carnobacterium sp. strain St2 (CarAlaDH) were cloned and expressed in Escherichia coli. Of all of the AlaDHs that have been sequenced, SheAlaDH exhibited the highest level of sequence similarity to the AlaDH from the gram-negative bacterium Vibrio proteolyticus (VprAlaDH). CarAlaDH was most similar to AlaDHs from mesophilic and thermophilic Bacillus strains. SheAlaDH and CarAlaDH had features typical of cold-adapted enzymes; both the optimal temperature for catalytic activity and the temperature limit for retaining thermostability were lower than the values obtained for the mesophilic counterparts. The k(cat)/K(m) value for the SheAlaDH reaction was about three times higher than the k(cat)/K(m) value for VprAlaDH, but it was much lower than the k(cat)/K(m) value for the AlaDH from Bacillus subtilis. Homology-based structural models of various AlaDHs, including the two psychotropic AlaDHs, were constructed. The thermal instability of SheAlaDH and CarAlaDH may result from relatively low numbers of salt bridges in these proteins.  (+info)

*Harry Pennell

1922). "Antarctic Regions". Encyclopædia Britannica. 30 (12th ed.). London & New York. p. 140. CWGC entry Harry Pennell ...

*Arturo Montero

Chilean Antarctic Region. 1999 Speleoanthropology, prospection of the caverns Ana Te Pora and Ana Te Pahu in the Polynesia, ... focused on help vulnerable communities in remote regions in case of disaster. His last work in charge of a rescue section was ...

*Library of Congress Classification:Class G, subclass G -- Geography (General). Atlases. Maps

575-890..........Arctic and Antarctic regions 905-910..........Tropics (General) 912-922........... Northern and Southern ... Torrid Zone 3250-3251..........Temperate Zone 3260-3272..........Polar regions. Frigid Zone 3290-9880..........By region or ... Torrid Zone 1054-1055..........Polar regions. Frigid Zone 1059-1061..........Maritime atlases (General) 1100-3102..........By ... and mythological regions, etc., A-Z 3160-3171..........Globes 3180-9980..........Maps 3180-3182..........Universe. Solar system ...

*Xanthoria elegans

It is widespread in Antarctic regions. The lichen is used as a model system to study the potential to resist extreme ...

*Polar Record

"Arctic & Antarctic Regions - Database Coverage List". EBSCOhost. Archived from the original on 2012-10-04. Retrieved Feb 22, ... Polar Record is a quarterly peer-reviewed academic journal covering all aspects of Arctic and Antarctic exploration and ... "so much exploration and exploitation in the polar regions, the news of which appear in so many forms and languages", and that " ...

*Navicula dobrinatemniskovae

... is an algal species of the genus of Navicula, known from inland waters of the Antarctic region. The ... "Diatoms from the Antarctic Region, Maritime Antarctica". Iconographia Diatomologica Vol. 24, Koeltz Botanical Books, 504p. ... Maritime Antarctic Region)." Plant Ecology and Evolution 148.3 (2015): 431-455. Kopalová, Kateřina, and Bart van de Vijver. " ... in inland waters of the Sub-Antarctic and Antarctic with the description of five new species". Phycologia. 50 (3): 281-297. doi ...

*Antonov An-74

... research operations in Arctic or Antarctic regions; visual ice patrol; fishery reconnaissance. As of January 1, 2006, 23 out of ... An-74: Arctic/Antarctic support model with room for five crew, increased fuel capacity, larger radar in bulged nose radome, ... de-icing equipment and a number of other upgrades allowing the aircraft to support operations in Arctic or Antarctic ...

*Jerzy Dzik

The euphausiid species of the Antarctic region. Polskie Archiwum Hydrobiologii 25, 3, 589-605. Jażdżewski, K., Dzik, J., ... A myodocopid ostracode with preserved appendages from the Upper Jurassic of the Volga River Region (USSR). Neues Jahrbuch für ...

*Polar ecology

The animals that do exist in the polar region are similar between the Antarctic and Arctic regions. The animals do differ by ... Polar environments are in the Arctic and Antarctic regions. Arctic regions are in the Northern Hemisphere, and it contains land ... Polar regions also contain the subantarctic and subarctic zone which separate the polar regions from the temperate regions. ... Antarctic silverfish and lanternfish are some examples of fish that live in Antarctica. Seals are also found in polar regions ...

*Dichomeridinae

Almost worldwide, except the Arctic and Antarctic regions. The subfamily formerly included three tribes, about 29 genera and ...

*Notodiscus hookeri

This snail lives on islands in the sub-Antarctic region. Its shell is unique among land snails in that the organic part of the ... Notodiscus hookeri has a wide distribution in the sub-Antarctic region. It is the only native terrestrial gastropod species ... and site isolation in a singular sub-Antarctic land snail". Antarctic Science 23(5): 442-448. doi:10.1017/S0954102011000289. ... Notodiscus hookeri was depicted on the 2012 €0.60 French Southern and Antarctic Lands postal stamp. List of non-avian fauna of ...

*Extremes on Earth

01-03-2017) "WMO verifies highest temperatures for Antarctic Region". World Meteorological Organisation. Retrieved 29-03-2017. ... Indicator 62 - Water levels of Deep Lake, Vestfold Hills Archived 2009-07-05 at the Wayback Machine., Australian Antarctic Data ... These measurements reflect averages over a large region and so are lower than the maximum point surface temperature. Satellite ...

*Prince Edward Islands

ISBN 978-0-00-616116-5. Ross, James Clark (1847). A Voyage of Discovery and Research in the Southern and Antarctic Regions. ... Antarctic Legacy of South Africa. ISBN 978-0-620-74912-1. CS1 maint: Extra text: authors list (link) "The killer mice of Gough ... South African National Antarctic Programme SANAE Gough Island Crozet Islands SA Agulhas SA Agulhas II Protected areas of South ... The Prince Edward Islands are two small islands in the sub-antarctic Indian Ocean that are part of South Africa. The islands ...

*Solar eclipse of November 23, 2003

It was visible from a corridor in the Antarctic region. A partial eclipse was seen from the much broader path of the Moon's ... Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region ... Flight over Antarctica Images from Antarctica by Crayford Manor House Astronomical Society [1] APOD 8/5/2004, An Antarctic ...

*Economy of the Falkland Islands

"Antarctic Region" (PDF). United Nations Environment Protection. Retrieved 30 June 2010. "Text of the convention on the ... The CCAMLR provides a forum for exchanging information regarding marine life in the Antarctic region and has the authority to ... In its wake, the Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR), a treaty signed by 24 nations ... The convention requires that member states who are not parties to the Antarctic Treaty accept certain provisions of that treaty ...

*Antarctic prion

This is in reference to the desolate Antarctic region where they live. Also from the Greek language, prion comes from the word ... The Antarctic prion is a member of the Pachyptila genus, and along with the blue petrel makes up the prions. They in turn are ... The Antarctic prion (Pachyptila desolata) also known as the dove prion, or totorore in Maori, is the largest of the prions, a ... The Antarctic prion nests in colonies, and prefers islands in the Southern ocean. Both sexes assist in building the nest, as ...

*Oceanwide Expeditions

The tours take passengers to the Arctic and Antarctic regions with different points of destinations in which they can go ashore ... Oceanwide Expeditions is a Dutch company organising tours to the Arctic and Antarctic regions. With their own fleet of vessels ... In the Antarctic this is International Association of Antarctic Tour Operators (IAATO) and BirdLife International. Oceanwide ... September and the best time to visit the Antarctic region is in the summer of the southern hemisphere October - March. ...

*Science and technology in Bulgaria

Since the 1980s, Bulgaria maintains an active exploration program of the Antarctic region. Following an unsuccessful landing ... "Bulgarian Antarctic Expedition to Research Climate Change, Build Church". Novinite. 1 November 2011. Retrieved 2 November 2011 ... Bulgaria conducts frequent Antarctic exploration missions by means of an artificial satellite and a permanent research base, ...

*Sheathbill

... they are the only bird family endemic as breeders to the Antarctic region. They are also the only Antarctic birds without ... Near the few human settlements of the region, they boldly forage for offal. Because of this diet, they spend a good deal of ... They are commonly known in the Antarctic as "Mutts" because of their call which is a soft "Mutt, mutt, mutt" They habitually ... They breed on subantarctic islands and the Antarctic Peninsula, and the snowy sheathbill migrates to the Falkland Islands and ...

*Saint Peter and Saint Paul Archipelago

He was in charge of an expedition to the Antarctic regions with two vessels, HMS Erebus and HMS Terror. Robert McCormick gave ... in Portuguese) Ross, James Ross (1847). A Voyage of Discovery and Research in the Southern and Antarctic Regions. London: John ... Paul Frature Zone region. Marine Geophysical Research, 21, 529-560. Melson, W.G., Jarosewich, E., Bowen, V.T., Thompsonm G. ... It lies in the Intertropical Convergence Zone, a region of the Atlantic characterized by low average winds punctuated with ...

*Biogeography of Deep-Water Chemosynthetic Ecosystems

... the SE Pacific region; Area C: NZ region; Area D: the Arctic and Antarctic regions, within the International Polar Year. ... Only a small fraction of the global ridge system (~65000 km) and of the vast continental margin regions have been explored and ... Category I, combined areas: Area A: Equatorial Atlantic Belt region; Area B: ...

*Jason (ship)

Larsen, C.A. "The Voyage of the "Jason" to the Antarctic Regions." The Geographical Journal, Vol. 4, No. 4. (Oct., 1894), pp. ... From 1892 to 1894, the ship was used on scientific whaling expeditions to the Antarctic, funded by A/S Oceana. The purpose of ... was noted for her participation in an 1892-1893 Antarctic expedition led by Carl Anton Larsen. Additionally, the vessel was ... noted for reaching 68°10'S, setting a new record for distance travelled south along the eastern Antarctic Peninsula. The ship's ...

*Polar seas

Compared with the Antarctic region, the Arctic has long history of interaction with man. The polar food web structure can be ... In addition to relatively thin sea ice, thick and extensive ice shelves (floating glaciers) are present in the Antarctic region ... The study of Antarctic ice, its distribution, changes in ice volume, and other indicators of the continental climate in ... "10 years of Antarctic protection!". Archived from the original on 2008-12-22. Watch an amazing 360 degree journey through the ...

*Palpigradi

They can be found on every continent, except in Arctic and Antarctic regions. Terrestrial Palpigradi have hydrophobic cuticles ...

*Arachnid

They can be found on every continent, except in Arctic and Antarctic regions. Phalangiotarbi is an extinct arachnid order known ... This anterior body region is called the gnathosoma (or capitulum) and is also found in the Ricinulei. The remainder of the body ... They range worldwide, even in temperate to cold regions, but have their most dense and diverse populations in the tropics and ... Most Solifugae live in tropical or semitropical regions where they inhabit warm and arid habitats, but some species have been ...

*List of birds of the Falkland Islands

Chionididae The sheathbills are scavengers of the Antarctic regions. They have white plumage and look plump and dove-like but ... They nest on the ground in temperate and arctic regions and are long-distance migrants. Chilean skua, Stercorarius chilensis (V ... Fulmarus glacialoides Antarctic petrel, Thalassoica antarctica (V) Cape petrel, Daption capense Snow petrel, Pagodroma nivea (V ... Sterna hirundinacea Antarctic tern, Sterna vittata Snowy-crowned tern, Sterna trudeaui (V) Sandwich tern, Thalasseus ...
Palaeogene volcanics with plant-bearing sediment intercalations crop out extensively on King George Island in the South Shetland Islands, West Antarctica. The plant fossil assemblages are the most complete Palaeogene terrestrial foliar record in Antarctica. Compositional variations in the flora have previously been used to construct climate change models for the Tertiary. King George Island is part of the late Triassic to Recent, Andean - West Antarctic subducting margin. Eastwards subduction oceanic crust beneath the Antarctic Peninsula resulted in mountain building and crustal melting at depth that in turn led to large stratovolcanoes and active pyroclastic volcanism (Leat et al., 1995). Consequently the flora is preserved in a range of primary and reworked volcaniclastic sediments, that were deposited in lacustrine and ephemeral lacustrine basins developed on the volcanic surface. The King George Island flora consists of impressions and carbonised compressions of leaves of angiosperms, ...
The Notothenioidei dominates the fish fauna of the Antarctic in both biomass and diversity. This clade exhibits adaptations related to metabolic function and freezing avoidance in the subzero Antarctic waters, and is characterized by a high degree of morphological and ecological diversity. Investigating the macroevolutionary processes that may have contributed to the radiation of notothenioid fishes requires a well-resolved phylogenetic hypothesis. To date published molecular and morphological hypotheses of notothenioids are largely congruent, however, there are some areas of significant disagreement regarding higher-level relationships. Also, there are critical areas of the notothenioid phylogeny that are unresolved in both molecular and morphological phylogenetic analyses. Previous molecular phylogenetic analyses of notothenioids using partial mtDNA 12S and 16S rRNA sequence data have resulted in limited phylogenetic resolution and relatively low node support. One particularly controversial result
This study was conducted to describe the cardiovascular responses to intra-arterial injections of serotonin in the Antarctic fish Pagothenia borchgrevinki and to elucidate the underlying mechanisms. Immunohistochemistry was used to localise serotonin-containing cells within the gills. Simultaneous and continuous recordings of ventral and dorsal aortic blood pressure, heart rate and ventral aortic blood flow (cardiac output) were made using standard cannulation procedures in combination with Doppler flow measurement. An extracorporeal loop with an in-line oxygen electrode allowed continuous measurements of arterial oxygen pressure PaO2. Pre-branchial injection of serotonin (5-hydroxytryptamine, 5-HT) or the 5-HT2 receptor agonist alpha-methylserotonin increased the branchial vascular resistance and ventral aortic pressure, while the 5-HT1 receptor agonist piperazine was without effect. The branchial vasoconstriction produced by serotonin injection was completely blocked by the 5-HT1/5-HT2 ...
The ocellated icefish (Chionodraco rastrospinosus) is a fish of the family Channichthyidae. It lives in the cold waters off Antarctica and is known for having transparent haemoglobin-free blood. C. rastrospinosus live in the Southern Ocean up to a depth of 1 km. They grow up to 52 centimetres (20 in) and average 30 centimetres (12 in). The adults feed on krill and other fish. Larvae are 17 mm long when they hatch, and grow by about 2 mm a week. The larval stage lasts for up to 18 months during which they feed mainly on krill. They become sexually mature at four years, and normally live up to about eight years, but sometimes as long as twelve. In the Antarctic autumn, adult C. rastrospinosus migrate to shallow waters to spawn at a depth of 200-300 m. The eggs are scattered and hatch six months later around April. Haemoglobin gives oxygenated blood its red colour. Unlike other vertebrates, fish of the Antarctic icefish family (Channichthyidae) do not use haemoglobin to transport oxygen around ...
Juvenile stages are often thought to be less resistant to thermal challenges than adults, yet few studies make direct comparisons using the same methods between different life history stages. We tested the resilience of juvenile stages compared to adults in 4 species of Antarctic marine invertebrate over 3 different rates of experimental warming. The species used represent 3 phyla and 4 classes, and were the soft-shelled clam Laternula elliptica, the sea cucumber Cucumaria georgiana, the sea urchin Sterechinus neumayeri, and the seastar Odontaster validus. All four species are widely distributed, locally abundant to very abundant and are amongst the most important in the ecosystem for their roles. At the slowest rate of warming used (1°C 3 days−1) juveniles survived to higher temperatures than adults in all species studied. At the intermediate rate (1°C day−1) juveniles performed better in 3 of the 4 species, with no difference in the 4th, and at the fastest rate of warming (1°C h−1) L. ...
The Antarctic icefishes (family Channichthyidae, suborder Notothenioidei) constitute the only vertebrate taxon that fails to produce red blood cells. These fishes can be paired with closely related, but erythrocyte-producing, notothenioids to discover erythropoietic genes via representational difference analysis. Using a B30.2-domain-encoding DNA probe so derived from the hematopoietic kidney (pronephros) of a red-blooded Antarctic rockcod, Notothenia coriiceps, we discovered a related, novel gene, bloodthirsty (bty), that encoded a 547-residue protein that contains sequential RING finger, B Box, coiled-coil, and B30.2 domains. bty mRNA was expressed by the pronephric kidney of N. coriiceps at a steady-state level 10-fold greater than that found in the kidney of the icefish Chaenocephalus aceratus. To test the function of bty, we cloned the orthologous zebrafish gene from a kidney cDNA library. Whole-mount in situ hybridization of zebrafish embryos showed that bty mRNA was present throughout ...
The purpose of this study was to extend our investigation into the regulation of the HSR in the Antarctic notothenioid fish Trematomus bernacchii, a species that appears to lack heat-inducible Hsp expression (Hofmann et al., 2000). The fishes endemic to the Southern Ocean display a range of biochemical and molecular processes that allow them to tolerate their extreme environment and, in some cases, have lost attributes common to other fish (Somero et al., 1998). These changes include the production of anti-freeze proteins (DeVries, 1988), the loss of hemoglobin and/or myoglobin in some species (Cocca et al., 1997; Sidell et al., 1997; Somero et al., 1998) and the storage of extra lipid reserves for energy (Sidell et al., 1995), buoyancy (Eastman, 1988) and for aiding in oxygen delivery to tissues (Londraville and Sidell, 1990). To address the possibility that such a cold-adapted species could lose an otherwise highly conserved cellular response to heat stress, we examined the expression of hsp ...
It is now clear that six of the 16 known species of Antarctic channichthyid icefish have lost the ability to express Mb in their heart ventricles; the remaining ten species of icefish do produce the protein in ventricular muscle. Furthermore, mapping the topology of Mb expression upon the best available cladistic phylogeny for this recently evolved group permits us to conclude that events leading to the loss of Mb expression in the icefish family have occurred independently at least four times during their radiation (Moylan and Sidell, 2000). Loss of expression of `normally physiologically important protein(s) in notothenioid fishes is not restricted to myoglobin. For example, Hofmann et al. (2000) have documented the absence of inducible production of heat-shock proteins in Trematomus bernacchii, and it has long been known that all members of the family Channicthyidae lack the circulating oxygen-binding protein, hemoglobin (Hb). Detrich and coworkers have established that loss of Hb expression ...
Hoffman, J., Peck, L., Linse, K., & Clarke, A. C. (2011). Strong population genetic structure in a broadcast-spawning Antarctic marine invertebrate. Journal of Heredity, 102(1), 55-66. doi:10.1093/jhered/ ...
The Antarctic marine fauna has been isolated in the cold (-2°C), stable, and oxygen-rich Southern Ocean for 25 million years, and consequently these animals are extremely cold-adapted. One family within the Antarctic notothenioid fishes, the icefish, has lost the capacity to produce erythrocytes and the oxygen transport protein hemoglobin. Their profound anemia makes them an evolutionary mutant model of human anemias. Using a comparative-genomic approach, we have isolated 10 novel genes that are differentially expressed by the red-blooded species Notothenia coriiceps and the "white-blooded" icefish, Chaenocephalus aceratus, and may be novel genes involved in erythropoiesis. We have identified one of these genes (hemogen - hemgn) as a putative ortholog of mammalian EDAG and RP59. In mammals, these genes are involved in the proliferation of blood and bone cells, however, whether the putative ortholog hemgn functions similarly in fishes has not be reported. In the current study, we use a ...
The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. However, it is difficult to clearly separate the individual contributions from the two sources, particularly the continental one during glacial periods. On the basis of Na+ and Ca2+ records at an unprecedented resolution from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core back to the penultimate glacial period, mean ion mass ratios were deduced for the continental and the sea-salt aerosol body over East Antarctica. The sea-salt ion mass ratios are in the range predicted for both wind-induced bubble bursting of breaking waves on the open ocean and sea ice brine-derived aerosols, respectively, thus allowing no clear decision on the contribution of sea ice to the central Antarctic sea-salt aerosol. The ...
The Antarctic Ecosystem Research Division ( AERD) conducts research to fulfill NOAAs mandate of providing scientific advice that supports United States (U.S.) interests related to resource management by the Commission for the Conservation of Antarctic Marine Living Resources ( CCAMLR), of which the U.S. is a Member. NOAA Fisheries Antarctic research is mandated by the U.S. Antarctic Marine Living Resources (AMLR) Convention Act of 1984, thus the program of work undertaken and managed by the AERD is widely known as the U.S. AMLR Program. The U.S. AMLR Program is internationally recognized for its ongoing contributions to ecosystem-based management of fisheries that impact krill, finfishes, krill-dependent predators, and other components of the Antarctic ecosystem. The AERD manages the US AMLR Program under the direction of George Watters. ...
The Antarctic Ecosystem Research Division ( AERD) conducts research to fulfill NOAAs mandate of providing scientific advice that supports United States (U.S.) interests related to resource management by the Commission for the Conservation of Antarctic Marine Living Resources ( CCAMLR), of which the U.S. is a Member. NOAA Fisheries Antarctic research is mandated by the U.S. Antarctic Marine Living Resources (AMLR) Convention Act of 1984, thus the program of work undertaken and managed by the AERD is widely known as the U.S. AMLR Program. The U.S. AMLR Program is internationally recognized for its ongoing contributions to ecosystem-based management of fisheries that impact krill, finfishes, krill-dependent predators, and other components of the Antarctic ecosystem. The AERD manages the US AMLR Program under the direction of George Watters. ...
We review the scientific literature, especially from the past decade, on the impacts of human activities on the Antarctic environment. A range of impacts has been identified at a variety of spatial and temporal scales. Chemical contamination and sewage disposal on the continent have been found to be long-lived. Contemporary sewage management practices at many coastal stations are insufficient to prevent local contamination but no introduction of non-indigenous organisms through this route has yet been demonstrated. Human activities, particularly construction and transport, have led to disturbances of flora and fauna. A small number of non-indigenous plant and animal species has become established, mostly on the northern Antarctic Peninsula and southern archipelagos of the Scotia Arc. There is little indication of recovery of overexploited fish stocks, and ramifications of fishing activity on bycatch species and the ecosystem could also be far-reaching. The Antarctic Treaty System and its ...
Antarctic sea ice is constantly on the move as powerful winds blow it away from the coast and out toward the open ocean. A new study shows how that ice migration may be more important for the global ocean circulation than anyone realized.
Lemke, P. (1980): Linear stochastic dynamic model of Arctic and Antarctic sea ice variability , Workshop on Stochastic Dynamic Forecasting, October 1979, ECMWF, Reading, England ...
Quantification of ikaite in Antarctic sea ice - Volume 25 Issue 3 - Michael Fischer, David N. Thomas, Andreas Krell, Gernot Nehrke, Jörg Göttlicher, Louiza Norman, Klaus M. Meiners, Catherine Riaux-Gobin, Gerhard S. Dieckmann
Plankton sampling by the training vessel Umitaka-maru in the Indian sector of the Southern Ocean in the austral summer of 2010/2011Plankton sampling by the training vessel Umitaka-maru in the Indian sector of the Southern Ocean in the austral summer of 2010/2011AA12026903 ...
April Flowers for redOrbit.com - Your Universe Online One of the fastest warming regions on the planet - and the fastest warming part of the Southern Hemisphere - is the western Antarctic Peninsula. This warming has been the subject of scientific debate, especially in light of recent instrumental records of both atmospheric and oceanic warming from the region. Holding an equivalent of 5 meters of global sea level rise locked in ice, the Antarctic ice sheet is becoming increasingly vulnerable to collapse as the atmosphere and oceans continue to warm.. A new study from Cardiff University, published in a recent issue of Nature Geoscience, has traced glacial ice entering the ocean along the western Antarctic Peninsula using a unique 12,000-year record of microscopic marine algae fossils. The findings reveal that in the late Holocene - approximately 3500 - 250 years ago - the atmosphere had a more significant impact on warming along the western Antarctic Peninsula than oceanic circulation did.. Prior ...
Roberts, Donna (1997) Reconstruction of lake-water salinity from fossil diatom assemblages in saline lakes of the Vestfold Hills, Antarctica. PhD thesis, University of Tasmania. ...
Half of all vertebrate species share a series of chromosome fusions that preceded the teleost genome duplication (TGD), but we do not understand the causative evolutionary mechanisms. The Robertsonian-translocation hypothesis suggests a regular fusion of each ancestral acro- or telocentric chromosome to just one other by centromere fusions, thus halving the karyotype. An alternative genome-stirring hypothesis posits haphazard and repeated fusions, inversions, and reciprocal and nonreciprocal translocations. To study large-scale karyotype reduction, we investigated the decrease of chromosome numbers in Antarctic notothenioid fish. Most notothenioids have 24 haploid chromosomes, but bullhead notothen (Notothenia coriiceps) has 1. To understand mechanisms, we made a RAD-tag meiotic map with approximate to 10,000 polymorphic markers. Comparative genomics aligned about a thousand orthologs of platyfish and stickleback genes along bullhead chromosomes. Results revealed that 9 of 11 bullhead chromosomes arose
Early ecological research in McMurdo Sound revealed local spatial gradients in community structure associated with variations in anchor ice disturbance, fast ice and snow cover, and the effects of predators. Research contrasting the east and west sides of McMurdo Sound has shown major differences in benthic communities, which have been attributed to oceanographic influences on the advection of water-column productivity and the frequency of fast ice break-out. Despite these regional and local differences, coastal benthic communities in McMurdo Sound show a high level of stability, and contain a variety of large and potentially very long-lived species. In Terra Nova Bay, about half way along the Victoria Land Coast of the western Ross Sea, the coastal benthic communities provide some insightful contrasts with those in McMurdo Sound. For example, the abundance and depth distribution of dominant species such as Sterechinus neumayeri and Adamussium colbecki are markedly different from McMurdo Sound. ...
A new genus and species of zoarcid fish, Gosztonyia antarctica, is described on the basis of four specimens collected from the Bellingshausen Sea, Antarctic Ocean, at a depth of 615 m. Gosztonyia is placed in the subfamily Lycodinae and can be distinguished from all other zoarcid genera by the following combination of characters: seven branchiostegal rays, interdigitating ceratohyal-epihyal articulation, palatal arch reduced, posterior hyomandibular ramus longer than anterior, cranium narrowed, supratemporal commisure and occipital pores absent. A new species, Gosztonyia antarctica, is described and the relationships of the new genus are discussed. ...
The microbial communities that inhabit lithic niches inside sandstone in the Antarctic McMurdo Dry Valleys of life’s limits on Earth. The cryptoendolithic communities survive in these ice-free areas that have the lowest temperatures on Earth coupled with strong thermal fluctuations, extreme aridity, oligotrophy and high levels of solar and UV radiation. In this study, based on DNA metabarcoding, targeting the fungal Internal Transcribed Spacer region 1 (ITS1) and multivariate statistical analyses, we supply the first comprehensive overview onto the fungal diversity and composition of these communities sampled over a broad geographic area of the Antarctic hyper-arid cold desert. Six locations with surfaces that experience variable sun exposure were sampled to compare communities from a common area across a gradient of environmental pressure. The Operational Taxonomic Units (OTUs) identified were primarily members of the Ascomycota phylum, comprised mostly of the Lecanoromycetes and Dothideomycetes
Thehemolysateofthe AntarcticteleostGobionotothen gibberifrons(family Nototheniidae) contains two hemoglo-bins (Hb 1 andHb 2). The concentration of Hb 2 (15-20% of the total hemoglobin content) is higher than that found in most cold-adapted Notothenioidei. Unlike the other Antarctic species so far examined having two hemoglobins, Hb 1 and Hb 2 do not have globin chains in common. Therefore this hemoglobin system is made of four globins (two a-and twob-chains). The complete amino-acid sequence of the two hemoglobins (Hb 1,a 1 2b 1 2 ;Hb 2,a 2 b 2 2 ) has been established. ... ...
As expected, the population and allele patterns found within the Kerguelen Archipelago allow some general conclusions on the fate of populations after initial colonization. First of all, we note that these mice have retained a certain amount of genetic diversity. The heterozygosity values, as well as the average number of alleles, are comparable to the sample that we caught within a single deme in Europe (Paris). Since the mice that came with the first ship would likely represent the deme from the harbor where the ship started, we can assume that the mice entering these ships had a similarly reduced diversity (when compared to the diversity across demes in the French and German populations). Hence, there may have been only little additional loss of genetic diversity during the ship passage and after colonization. In population genetic terms this means that the mouse population would have quickly expanded after arrival on the Kerguelen Archipelago, which would have prevented further loss of ...
In a study spanning two decades, a team of researchers led by Colorado State University found declining numbers of soil fauna, nematodes and other animal species in the McMurdo Dry Valleys, one of the worlds driest and coldest ...
THE KERGUELEN ISLANDS are the exposed part of the Kerguelen oceanic plateau, a Large Igneous Province in the Antarctic plate domain. Its birth is related to both the spreading of the South East Indian Ridge (SEIR) overprinted by the long-lived Kerguelen plume. It provides a unique opportunity to study plume-ridge interactions and their implications for the composition of the oceanic mantle. Mantle xenoliths from the Kerguelen Islands are common in dykes or pipes of young alkaline lavas. The major and lithophile trace elements have been well-characterised over the last decade. The platinum group elements (PGE; Os, Ir, Ru, Rh, Pd, Pt) and chalcophile elements (S, Se, Cu) provide different information on the geological processes that operate in the lithosphere. This is because they are almost exclusively partitioned into a sulfide-rich melt, whereas major and lithophile trace elements have a greater affinity for silicate melts.. The PGE, S, Se and Cu were analysed in representative mantle xenoliths ...
The soils of the McMurdo Dry Valleys, Antarctica are an extreme polar desert, inhabited exclusively by microscopic taxa. This region is on the threshold of anticipated climate change, with glacial melt, permafrost thaw, and the melting of massive buried ice increasing liquid water availability and mobilizing soil nutrients. Experimental water and organic matter (OM) amendments were applied to investigate how these climate change effects may impact the soil communities. To identify active taxa and their functions, total community RNA transcripts were sequenced and annotated, and amended soils were compared with unamended control soils using differential abundance and expression analyses. Overall, taxonomic diversity declined with amendments of water and organic matter. The domain Bacteria increased with both amendments while Eukaryota declined from 38% of all taxa in control soils to 8% and 11% in water and OM amended soils, respectively. Among bacterial phyla, Actinobacteria (59%) dominated water
Chen, Z.Z., Cheng ,C.H.C., Zhang, J.F., Cao, L.X., Chen, L., Zhou, L.H., Jin, Y.D., Ye, H., Deng, C., Dai, Z.H., Xu, Q.H., Hu, P., Sun, S.H., Shen, Y. and Chen, L.B.(2008) Transcrintomic and genomic evolution under constant cold in Antarctic notothenioid fish. Proceedings of the National Academy of Sciences of the United States of America 105:12944-12949. The sub-zero temperatures of the Southern Oceans require special adaptation to these extreme conditions, and the unique fish fauna of this region has provided textbook examples of molecular adaptation and molecular evolution in the context of thermal physiology. Previous studies have typically investigated single loci, but, in an exciting new survey, Chen et al. (2008) take a novel approach to characterize the genome-wide changes in gene transcription and relate these to adaptation to the cold Antarctic waters. A particular strength of this research is its tripartite strategy ...
A long-term soil manipulation experiment has been conducted as part of the McMurdo Dry Valleys Long Term Ecological Research (LTER) project. This table contains hourly soil temperature measurements associated with the long-term manipulation experiment on the south side of Lake Hoare, Taylor Valley, Antarctica ...
Background Sooty (Puffinus griseus) and short-tailed (P. tenuirostris) shearwaters are abundant seabirds that range widely across global oceans. Understanding the foraging ecology of these species in the Southern Ocean is important for monitoring and ecosystem conservation and management. Methodology/Principal Findings Tracking data from sooty and short-tailed shearwaters from three regions of New Zealand and Australia were combined with at-sea observations of shearwaters in the Southern Ocean, physical oceanography, near-surface copepod distributions, pelagic trawl data, and synoptic near-surface winds. Shearwaters from all three regions foraged in the Polar Front zone, and showed particular overlap in the region around 140°E. Short-tailed shearwaters from South Australia also foraged in Antarctic waters south of the Polar Front. The spatial distribution of shearwater foraging effort in the Polar Front zone was matched by patterns in large-scale upwelling, primary production, and abundances of
In Antarctica, the environmental conditions and the restrictions imposed by the Antarctic Treaty prevent inoculation with foreign bacteria. Therefore, our aim was to investigate native bacterial consortia which might serve to design bacterial formulas suitable for soil bioremediation processes at cold temperatures. Two bacterial consortia, M10 and J13, were isolated from diesel contaminated Antarctic soils. Their ability to use hydrocarbons was evaluated in vitro and by the detection of three catabolic genes (alkB, nahAc, xylE). Both consortia showed similar 16S rRNA gene profiles, suggesting the presence of the same phylotypes. Total 16S rDNA was cloned from M10 grown on diesel. Sixty clones were screened, grouped by restriction profiles of PCR-amplified inserts and sequenced. T-RFLP (Terminal-Restriction-Fragment-Length-Polymorphism) of clones showed that all phylotypes from the entire consortia were recovered. A culture-dependent approach was used to isolate M10 components able to utilise ...
Sampling campaigns consist of 84 soil samples (28 per treatment) collected from permanent plots for quantification of soil biota (invertebrates determined by microscopy and bacteria by 16S rRNA sequencing) and intensive geochemical analyses. This experiment will address the overarching hypothesis: Climate warming in the McMurdo Dry Valleys will amplify connectivity among landscape units leading to enhanced coupling of nutrient cycles across landscapes, and increased biodiversity and productivity. Soil samples were taken for organism enumeration and moisture content analysis as follows: Sampling bags were prepared with one sterile Whirlpak bag and clean plastic scoop per sample. Samples were taken from within the 1m2 area of each plot. The location of the sampling was recorded each year so that areas were not re-sampled. Using the plastic scoop, soil was collected to 10 cm depth. Very large rocks (more than 20 mm diameter) were excluded from the sample. The soil was shoveled into the Whirlpak bag ...
Sampling campaigns consist of 84 soil samples (28 per treatment) collected from permanent plots for quantification of soil biota (invertebrates determined by microscopy and bacteria by 16S rRNA sequencing) and intensive geochemical analyses. This experiment will address the overarching hypothesis: Climate warming in the McMurdo Dry Valleys will amplify connectivity among landscape units leading to enhanced coupling of nutrient cycles across landscapes, and increased biodiversity and productivity. Soil samples were taken for organism enumeration and moisture content analysis as follows: Sampling bags were prepared with one sterile Whirlpak bag and clean plastic scoop per sample. Samples were taken from within the 1m2 area of each plot. The location of the sampling was recorded each year so that areas were not re-sampled. Using the plastic scoop, soil was collected to 10 cm depth. Very large rocks (more than 20 mm diameter) were excluded from the sample. The soil was shoveled into the Whirlpak bag ...
More modeling madness projecting the future, but the actual data for the past 30 years says otherwise, with a positive trend. Regular commenter Julienne Stroeve of NSIDC is one of the co-authors, so perhaps shell weigh in here. The article says They selected the five models that most closely reproduced changes in actual Antarctic sea…
From the British Antarctic Survey New climate history adds to understanding of recent Antarctic Peninsula warming Results published this week by a team of polar scientists from Britain, Australia and France adds a new dimension to our understanding of Antarctic Peninsula climate change and the likely causes of the break-up of its ice shelves. The…
Antarctic shallow‐water invertebrates are exceptional candidates to study population genetics and evolution, because of their peculiar evolutionary history and adaptation to extreme habitats that expand and retreat with the ice sheets. Among them, sponges are one of the major components, yet population connectivity of none of their many Antarctic species has been studied. To investigate gene flow, local adaptation and resilience to near‐future changes caused by global warming, we sequenced 62 individuals of the sponge Dendrilla antarctica along the Western Antarctic Peninsula (WAP) and the South Shetlands (spanning ~900 km). We obtained information from 577 double digest restriction site‐associated DNA sequencing (ddRADseq)‐derived single nucleotide polymorphism (SNP), using RADseq techniques for the first time with shallow‐water sponges. In contrast to other studies in sponges, our 389 neutral SNPs data set showed high levels of gene flow, with a subtle substructure driven by the ...
Article: Bush Claims More Power Than King George III or Cromwelll - President Bush has claimed powers for himself that are not only unconstitutional but exceed those papers assumed by Oliver Cromwell and King George III.
Climate warming affects the development and distribution of sea ice, but at present the evidence of polar ecosystem feedbacks on climate through changes in the atmosphere is sparse. By means of synergistic atmospheric and oceanic measurements in the Southern Ocean near Antarctica, we present evidence that the microbiota of sea ice and sea ice-influenced ocean are a previously unknown significant source of atmospheric organic nitrogen, including low molecular weight alkyl-amines. Given the keystone role of nitrogen compounds in aerosol formation, growth and neutralization, our findings call for greater chemical and source diversity in the modelling efforts linking the marine ecosystem to aerosol-mediated climate effects in the Southern Ocean.. ...
Climate warming affects the development and distribution of sea ice, but at present the evidence of polar ecosystem feedbacks on climate through changes in the atmosphere is sparse. By means of synergistic atmospheric and oceanic measurements in the Southern Ocean near Antarctica, we present evidence that the microbiota of sea ice and sea ice-influenced ocean are a previously unknown significant source of atmospheric organic nitrogen, including low molecular weight alkyl-amines. Given the keystone role of nitrogen compounds in aerosol formation, growth and neutralization, our findings call for greater chemical and source diversity in the modelling efforts linking the marine ecosystem to aerosol-mediated climate effects in the Southern Ocean.. ...
Antarctic ice core records have provided unprecedented information on past climatic changes and forcing factors on decadal to millennial timescales. The glaciochemical and stable isotope records of a
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The 16S rRNAs of nine new species of prokaryotes, that had been isolated from four lakes of the Vestfold Hills, have been sequenced. These sequences were compared with those of their closest taxonomic relatives available from publicly available databases. The Antarctic species were of wide diversity with representatives from the domains Archaea and Bacteria (sensu Woese). Generally, they were most closely related to organisms from marine environments. The sequence dissimilarity between the rRNA sequences of the Antarctic strains and their nearest known relatives suggest they diverged from each other much earlier than the establishment of their modern Antarctic habitat. The conserved nature of the 16S rRNA molecule suggests it may not be as useful for detecting evolutionary change in Antarctic prokaryotes as distinct from non-Antarctic prokaryotes. Although the optimal temperature for growth of each species is well above the temperature of its environment, each has a reduced optimal temperature ...
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Figure 2. Temperature anomalies averaged over the Southern Hemisphere (top), temperatures from the sub-Antarctic station Orcadas (middle), and hydrogen isotopes (a proxy for temperature) from James Ross Island on the Antarctic Peninsula (bottom). All the data are publicly available: GISS, SCAR, Nature. Why the ambiguity? After all, the results show that its now warmer on James Ross Island now than it has been at any time during at least the last millennium (see Figure 2), and its unequivocal that this recent warmth led to the demise of ice shelves in the area over the last few decades. Moreover, the rate of recent century-scale warming is at the upper limit of rates in the pre-anthropogenic era: Mulvaney et al. find that the most recent warming is faster than 99.7% of any other given 100-year period in the last 2000 years. Why then, doesnt this lead simply to the conclusion that this that recent warming and associated ice shelf collapse and glacier acceleration on the Antartic Pensinula is the ...
1] Few high-latitude terrestrial records document the timing and nature of the Cenozoic "Greenhouse" to "Icehouse" transition. Here we exploit the bulk geochemistry of marine siliciclastic sediments from drill cores on Antarcticas continental margin to extract a unique semiquantitative temperature and precipitation record for Eocene to mid-Miocene (~54-13 Ma). Alkaline elements are strongly enriched in the detrital mineral fraction in fine-grained siliciclastic marine sediments and only occur as trace metals in the biogenic fraction. Hence, terrestrial climofunctions similar to the chemical index of alteration (CIA) can be applied to the alkaline major element geochemistry of marine sediments on continental margins in order to reconstruct changes in precipitation and temperature. We validate this approach by comparison with published paleotemperature and precipitation records derived from fossil wood, leaves, and pollen and find remarkable agreement, despite uncertainties in the calibrations of ...
Fountain, A. G., G. L. Dana, K. J. Lewis, B. H. Vaughn, and D. M. McKnight (1998), Glaciers of the McMurdo Dry Valleys, southern Victoria Land, Antarctica, in Ecosystem Dynamics in a Polar Desert, the McMurdo Dry Valleys, Antarctica, edited by J. C. Priscu, pp. 65-76, Antarct. Res. Ser., vol. 72, AGU, Washington, D. C. ...
The Antarctic notothenioid Trematomus bernacchii (rock cod) lives at a constant mean temperature of - 1.9 °C. Gastric digestion under these conditions relies on the proteolytic activity of aspartic proteases such as pepsin. To understand the molecular mechanisms of Antarctic fish pepsins, T. bernacchii pepsins A1 and A2 were cloned, overexpressed in Escherichia coli, purified and characterized wit ...
All members of this group have to be fairly well adapted for the cold and you would think that they would have to be fairly warm blooded fish. Chaenocephalus aceratus is more of a no blooded fish. It is the only vertebrate to have lost its blood. It still has a sort of translucent liquid made of of plasma pumping through its veins, but it has no blood cells and not even haemoglobin is present. Haemoglobin is the molecule vertebrates use to carry Oxygen around the body. Plasma can carry a limited amount of Oxygen, but it is only 10% as efficient. To make up for this Chaenocephalus aceratus has an enormous heart and a higher volume of blood. This raises the question as to why they would loose rid of their blood. It doesnt give them an advantage in surviving the cold. I cant really answer that convincingly ...
Much of the work on the cause of Antarctic sea ice over recent decades has focused on atmospheric drivers but this paper focuses on the oceans role. The authors analyze the trend of Antarctic sea ice over the past 35 years on the basis of satellite data and model simulations forced with atmospheric reanalysis products. Their findings suggest that ocean processes play a crucial role in determining the seasonality of sea ice trends. They also reveal that the sea-ice response is regionally.. ...
Decapods - It is sometimes stated that there are no Decapod crustaceans in Antarctica (crabs, lobsters etc.), while this is not entirely true with 22 different species having been recorded, they are no where near as common as they are in other seas where they are usually very obvious, common and clearly an important part of the marine life. In addition to their scarcity, they are restricted to places where the water is above 0°C, largely due to a characteristic of their metabolism that means that they are unable regulate magnesium levels below around +1°C.. The fossil record shows that there were decapods present but had disappeared from Antarctic waters in any numbers from about 15 million years ago.. In recent years, spider crabs have been found in several locations around Antarctica, which has led to warnings of how an invasion could place much of the Antarctic marine fauna in danger as this new predator is now able to return to Antarctica now that sea temperatures were rising as a ...
Heterotrophic marine bacteria play key roles in remineralizing organic matter generated from primary production. However, far more is known about which groups are dominant than about the cellular processes they perform in order to become dominant. In the Southern Ocean, eukaryotic phytoplankton are the dominant primary producers. In this study we used metagenomics and metaproteomics to determine how the dominant bacterial and archaeal plankton processed bloom material. We examined the microbial community composition in 14 metagenomes and found that the relative abundance of Flavobacteria (dominated by Polaribacter) was positively correlated with chlorophyll a fluorescence, and the relative abundance of SAR11 was inversely correlated with both fluorescence and Flavobacteria abundance. By performing metaproteomics on the sample with the highest relative abundance of Flavobacteria (Newcomb Bay, East Antarctica) we defined how Flavobacteria attach to and degrade diverse complex organic material, how ...
Kroh, A. & Mooi, R. (2018). World Echinoidea Database. Echinidea. Accessed through: De Broyer, C.; Clarke, A.; Koubbi, P.; Pakhomov, E.; Scott, F.; Vanden Berghe, E. and Danis, B. (Eds.) (2018) Register of Antarctic Marine Species at: http://www.marinespecies.org/rams/aphia.php?p=taxdetails&id=510534 on 2018-02-20 ...
References:. Detailed description of methods are given in the published peer-reviewed papers listed below:. Goldman, J., Kranz, S., Young, J.N., Tortell, P.D., Bender, M., Morel, F.M.M. (2015) Gross and net production during the spring bloom along the Western Antarctic Peninsula New Phytologist 205 (1): 182-191. DOI: 10.1111/nph.13125.. Kranz, S., Young, J.N., Goldman, J., Tortell, P.D., Bender, M., Morel, F.M.M. (2015) Low temperature reduces the energetic requirement for the CO2 concentrating mechanism in diatoms. New Phytologist 205 (1): 192-201. DOI: 10.1111/nph.12976. Tortell, P.D., Asher, E.C., Dacey, J.W.H. Kranz, S., Young, J.N., Goldman, J. Ducklow, H., Grzymski, J. Stanley, R., Morel, F.M.M. (2014) Metabolic balance of coastal Antarctic waters revealed by autonomous high frequency pCO2 and dO2 /Ar measurements Geophysical Research Letters DOI: 10.1002/2014GL061266 Young, J.N., Goldman, J., Kranz, S., Tortell, P.D., Morel, F.M.M. (2015) Slow carboxylation of Rubisco constrains the rate ...
Johnson, A.C.. 1997 Aeromagnetic anomaly map of the central Antarctic Peninsula. In: Ricci, C.A., (ed.) The Antarctic Regions: geological evolution and processes. Siena, Terra Antartica Publication, 1193-1194. Full text not available from this repository. (Request a copy ...
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Llesources) Geol. & Geophys. llecords, 128, 1959. GUSEV, A. , The determination of the absolute altitudes of the Antaretic ice sheet, Doklady Akad. N aulc SSSR, 130, 530--532, 1960. , Sondages seismiques en Terre Adelie; rapports scientifiques des I~xpeditions Polaires Francaises S. III, 2, Ann. 9" 85-92, 1953. -It. Acad. Sc£. ~8, 576-579, 1959. , Ant(l1ct,1~C Record, 13, 8-9, 1961. KAPITZA, A. , N e\v data on the ice eavef thickness of the central region of Antarctica, Info. , Sov. Ant. , 10} 10-14, 1960. LATE PALAEOZOIC- MESOZOIC Fra. 4-The state of Antarctica in the late Paleozoic and early Mesozoic showing the extent of the depositional basin that gave rise to the Beacon System, and the LOwer Jurassic volcanism in East Antarctiea. In the Upper Jurassic extensive andesite-rhyolite eruptions occurred in the Antarctic Peninsula and South Shetland Islands, ·while in Alexander Island ashes were deposited in the sea offshore (Fig. 3) (which formed alongside the stable block of East ...
Oogenesis was examined in nine species of Antarctic fish to verify the existence of morphological peculiarities. The analyses were carried out on specimens belonging to three different families of Notothenioids (Nototheniidae, Channichthyidae and Bathydraconidae), all captured in the Ross Sea, in front of the Italian Station of Terra Nova Bay. Following dissection, the ovaries were processed and examined at the light and electron microscopes to determine the oocyte gross and fine morphology. The attention, in particular, was focused on the presence of cytoplasmic round bodies and on the organization of the cortical alveoli and the vitelline envelope. Results reveal significant specie-specific differences that could be partly correlated to the phylogenetic radiation but not to the peculiar environmental conditions being essentially comparable to those observed among temperate species.. ...
Embark on an adventure of a lifetime while crossing the Antarctic Circle. Discover South Shetlands King George Island, see an array of incredible wildlife and wander the incredible, icy shores of Antarctica.
Embark on an adventure of a lifetime while crossing the Antarctic Circle. Discover South Shetlands King George Island, see an array of incredible wildlife and wander the incredible, icy shores of Antarctica.
Skanska has, together with Cura-gruppen, signed an agreement with Sykehuset Vestfold HF for the expansion of the hospital in Vestfold, Norway. The contract is worth NOK 1.7 billion.. The project includes a new, 12,000-square-meter psychiatry building and a 33,000-square-meter building for somatic care. The project also includes alignment of the infrastructure, energy facilities and demolition of existing hospital buildings.. The contract is based on the IPD model (Integrated Project Delivery), where the parties will cooperate in the implementation phase with common incentives, also including subcontractors. For the project, Skanska has gathered expertise from Norway, Sweden, UK, and USA.. Construction work has begun. The Psychiatry building will be completed in March 2019 and the building for somatic care during the first quarter 2021.. ...
Genealogy for King George II Anthony of Greece (Schleswig-Holstein, Glücksburg), King of the Hellenes (1890 - 1947) family tree on Geni, with over 175 million profiles of ancestors and living relatives.
To a degree, the spectres of Christmas past still haunt the King George VI race. Kauto Star himself will lead the parade, after all, so providing his trainer and owner with the opportun
King George V is a very special edition from Johnnie Walker, packaged beautifully and made to celebrate the Royal Warrant bestowed upon the company by the monarch.
Bailly, N. (2015). Nototheniidae Günther, 1861. In: Froese, R. and D. Pauly. Editors. (2017). FishBase. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=151404 on 2017-12- ...
Sea icicles forming on undercut lip of the Drygalski Ice Tongue from wave action and freezing seawater, Ross Sea, Antarctica District, Antarctica Region, Antarctica stock photo. Quality New Zealand images by well known photographer Rob Suisted, Natures Pic Images.
Kerguelen Tern 33 cm; wingspan 71 cm. Forehead to nape black; upperparts, including uppertail-coverts, smoky grey, with contrasting white rump; outer tail streamers grey, tail greyish; smoky grey b
For the experts: Although several studies are devoted to determining the diversity of Antarctic heterobranch sea slugs, new species are still being discovered. Among nudibranchs, Doto antarctica Eliot, 1907 is the single species of this genus described from Antarctica hitherto, the type locality being the Ross Sea. Doto antarctica was described mainly using external features. During our Antarctic research on marine benthic invertebrates, we found D. antarctica in the Weddell Sea and Bouvet Island, suggesting a circumpolar distribution. Species affiliation is herein supported by molecular analyses using cytochrome c oxidase subunit I, 16S rRNA, and histone H3 markers. We redescribe D. antarctica using histology, micro-computed tomography (micro-CT), and 3D-reconstruction of the internal organs. Moreover, we describe a new, sympatric species, namely D. carinova Moles, Avila & Wägele n. sp., and provide an anatomical comparison between the two Antarctic Doto species. Egg masses in both species are ...
One of the most beautiful of the glass animals is the Crocodile Icefish, of the order Channichthyidae. They are aptly named, for they live only in Antarctic waters, where the ambient temperature is below 32 degrees Fahrenheit. While there are many transparent animals in the world, the icefish has done what no other vertebrate has been able to do: make its blood invisible.. In The Invisible Man, H.G. Wells titular antagonist, an albino by the name of Griffin, manages to make himself see-thru by filling the interstices of his cells with fluid, lowering its refractive index and rendering his cell walls clear, the way you can see through opaque paper by dipping it in oil. The problem, he found, was with his blood. Hemoglobin, the protein binding agent which carries oxygen, also happens to be what makes red blood red. An albino may lack melanin, but the pinkness in their eyes and skin proves they havent lost their hemoglobin pigment. In fact, if anyone were to lose their hemoglobin, they would ...
Genetic variation of the Antarctic anisakid Contracaecum radiatun from the Ross and Weddell Seas is studied at 24 enzyme loci. All polymorphic loci proved to be in Hardy-Weinberg equilibrium, with no significant differences between the samples tested. Several loci were found to be diagnostic between C. radiatum and the five known members of the C. osculatum complex, indicating that no gene exchange occurs between them and confirming their specific status. No F1 hybrids, recombinant or introgressed individuals, sharing radiatum and osculatum alleles, were detected in the Antarctic Contracaecum samples; this directly proves the reproductive isolation of C. radiatum. Biochemical keys are given for the identification of Antarctic C. radiatum, C. osculatum D and E, both for adults (males and females) and larvae. Higher values of genetic variability were observed in these Antarctic Contracaecum species than in the Arctic-Boreal C. osculatum members, possibly related to a lower degree of habitat ...
The Antarctic continent is considered the coldest and driest place on earth with simple ecosystems, devoid of higher plants. Soils in the ice-free regions of Antarctica are known to harbor a wide range of microorganisms from primary producers to grazers, yet their ecology and particularly the role of viruses is poorly understood. In this study, we examined the virus community structures of 14 soil samples from the Mackay Glacier region. Viral communities were extracted from soil and the dsDNA was extracted, amplified using single-primer amplification, and sequenced using the Ion Torrent Proton platform. Metadata on soil physico-chemistry was collected from all sites. Both read and contig datasets were analyzed with reference-independent and reference-dependent methods to assess viral community structures and the influence of environmental parameters on their distribution. We observed a high heterogeneity in virus signatures, independent of geographical proximity. Tailed bacteriophages were dominant in
PALAOA stands for PerenniAL Acoustic Observatory in the Antarctic Ocean and also means "whale" in the ancient Hawaiian language. It is the only hydroacoustic observatory in the immediate vicinity of the Antarctic continent, or more exactly on the Ekström Ice Shelf in the eastern Weddell Sea at 70°31S 8°13W. In December 2005, several hydrophones and sensors were positioned under the ice through holes drilled through the floating, 100 meter thick ice shelf around 25 kilometres north of the German Neumayer Station. Continuous recording of the underwater sounds for a period of several years enables unique acoustic observation of the underwater animal world. The recordings are made year-round and enable comparisons of the acoustic environment between years. In terms of energy, PALAOA is self-sufficient: solar cells and a wind generator supply the observatory with renewable energy 90% of the time. During the months of darkness in the Antarctic winter and at temperatures down to 50°C, a fuel cell ...
Penguin guano has been accused of dumping arsenic in Antarctica soil by Chinese researchers. A research team led by Zhouqing Xie of the Institute of Polar Environment at the University
TY - JOUR. T1 - Autonomous Biogeochemical Floats Detect Significant Carbon Dioxide Outgassing in the High-Latitude Southern Ocean. AU - Gray, Alison R.. AU - Johnson, Kenneth S.. AU - Bushinsky, Seth M.. AU - Riser, Stephen C.. AU - Russell, Joellen. AU - Talley, Lynne D.. AU - Wanninkhof, Rik. AU - Williams, Nancy L.. AU - Sarmiento, Jorge L.. PY - 2018/1/1. Y1 - 2018/1/1. N2 - Although the Southern Ocean is thought to account for a significant portion of the contemporary oceanic uptake of carbon dioxide (CO2), flux estimates in this region are based on sparse observations that are strongly biased toward summer. Here we present new estimates of Southern Ocean air-sea CO2 fluxes calculated with measurements from biogeochemical profiling floats deployed by the Southern Ocean Carbon and Climate Observations and Modeling project during 2014-2017. Compared to ship-based CO2 flux estimates, the float-based fluxes find significantly stronger outgassing in the zone around Antarctica where carbon-rich ...
Overnight we sailed from Sitkoh Bay near Angoon (lower right of map) to George Island near Elfin Cove (top left of map). As you can see we were still not far from Juneau (top right)... our starting point! But we had explored and experienced so much that is never seen from the large cruise ships. Elfin…
The contrast in life between the continent and the Southern Ocean is amazing: the largest land animal supported by the terrestrial ecosystem is the midge; whereas Blue Whales, the largest animals on the planet, are found in the surrounding seas. Even though seals and penguins spend some of their time out of the water, they too rely entirely on the sea for their food supply and are therefore part of the marine ecosystem.. This section looks at the ecology of the Southern Ocean in terms of its productivity, its various types of plants and animals, and the feeding relationships that exist between these organisms. As described further in The coast and adjacent ocean, the Southern Ocean extends from Antarcticas coastline to the Antarctic Polar Front - a transition zone that separates the cold waters surrounding Antarctica from the relatively warmer waters of the South Atlantic, Pacific and Indian Oceans. The sea surface temperature of the Southern Ocean ranges from as low as -1.8°C near the ...
A. Wilmotte, C. Demonceau, A. Goffart, J.-H. Hecq, V. Demoulin & A.C. Crossley (2002) Molecular and Pigment Studies of the picophytoplankton in a region of the Southern Ocean (47 to 54°S, 141 to 144 °E) in March 1998. Deep Sea Research II, F.I.: 1.1610, 49, 3351-3363. A. Taton, S. Grubisic, E. Brambilla, R. De Wit, & A. Wilmotte (2003). Cyanobacterial Diversity in Natural and Artificial Microbial Mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a Morphological and Molecular Approach. Appl. Environ. Microbiol, F.I.: 3.6910, 69, 5157-5169.. Sabbe K., D. Hodgson, E. Verleyen, A. Taton, A. Wilmotte, K.Vanhoutte and W. Vyverman (2004) - Effects of physical disturbance, salinity and light regime on microbial mat structure and composition in continental Antarctic lakes (Larsemann Hills and Bølingen Islands). Freshwater Ecology, 49:296-319.. Hodgson D.A., W. Vyverman, E. Verleyen, K. Sabbe, P.R. Leavitt, A. Taton, A.H. Squier & B.J.K. Keely (2004) - Environmental factors influencing the ...
Looking for Antarctica? Find out information about Antarctica. the fifth largest continent, c.5,500,000 sq mi , asymmetrically centered on the South Pole and almost entirely within the Antarctic Circle. Antarctica... Explanation of Antarctica
Résumé: Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from the interaction between the Antarctic Circumpolar Current and the local bathymetry. Net primary production, N uptake (NO3- and NH4+), and nitrification rates were measured at eight stations in austral spring 2011 (October-November) during the KEOPS 2 cruise in the Kerguelen Plateau area. Natural iron fertilization stimulated primary production, with mixed layer integrated net primary production and growth rates much higher in the fertilized areas (up to 315 mmol C m -2 d−1 and up to 0.31 d−1 respectively) compared to the HNLC reference site (12 mmol C m−2 d−1 and 0.06 d−1 respectively). Primary production was mainly sustained by nitrate uptake, with f ratios (corresponding to NO3−-uptake / (NO3− - uptake + NH4+ - uptake)) ...
Nasas pioneering satellite, designed to map carbon dioxide concentrations, has crashed into the ocean near Antarctica after running into technical difficulties during launch
Laurence McKinley Gould, the well-loved Antarctic explorer, professor and former Carleton president, already has a lengthy list of namesakes including Antarctic mountains, bays, glaciers, coasts and the Carleton library. At a dedication ceremony on October 9, the world received one more -- a 230-foot research vessel/ice breaker.. The R/V Laurence M. Gould, a towering red ship, weighs in at nearly 1600 tons and can support up to 26 research scientists on 75-day missions into the Antarctic region. It will be used for oceanographic and marine biological research by the United States Antarctic Program, while transporting researchers and supplies between Palmer Station and South American ports.. Gould was catapulted to international fame after serving as second in command to Adm. Richard E. Byrd during Byrds first Antarctic expedition in 1928-30. He came to Carleton as a professor in 1932 and helped establish the colleges geology department. Eventually, Gould became Carletons fourth president, ...
The taxonomic position of the endemic Antarctic species Enchodeloides signyensis (Loof, 1975), gen. n., comb. n. (= Enchodelus signyensis Loof, 1975) is discussed on the basis of morphological study, including SEM, morphometric data, postembryonic observations, and sequence data of 18S rDNA and the D2-D3 expansion fragments of the large subunit rDNA. A number of characters such as the cuticle and stoma structures, including the presence of moderately developed cuticularised ring around the oral aperture, peculiarities of pharynx expansion, size and position of the posterior pair of pharyngeal nuclei, a less complex uterus, and the position of a posterior ventromedian supplement show that this species differs substantially from the other members of the genus Enchodelus. Furthermore, both the 18S and 28S rDNA-based phylogenetic trees of the Enchodelus sequences available in the GenBank formed two distinct clusters with E. signyensis being a part of a well-supported group with species of the genus
Soil samples were taken for organism enumeration and moisture content analysis as follows: Sampling bags were prepared with one sterile Whirlpak bag and clean plastic scoop per sample. Samples were taken from within the 85 cm diameter circular area of each plot. The location of the sampling was recorded each year so that areas were not re-sampled. Using the plastic scoop, soil was collected to 10 cm depth. Very large rocks (,20 mm diameter) were excluded from the sample. The soil was shoveled into the Whirlpak bag until three quarters full (about 1.5 kg soil). The soil was mixed well in the bag, then the bag was closed tightly, expelling as much air as possible. The so il samples were stored in a cooler for transportation. On return to the laboratory (within 8 hours of sampling), the soils were stored at +5°C until further processing. In the laboratory, soil samples were handled in a laminar flow hood to prevent contamination. The Whirlpak bags of soil were mixed thoroughly prior to ...
The different oceanic zones : Summary of the species - Marine currents and other maps, Bipolar species, Antarctic species, Arctic and sub-Arctic species - Diversity and Geographic Distribution of Pelagic Copepoda
FACILITIES, LOGISTICS, AND SUPPORT. Facilities for research in Antarctica include three year-round research stations with scientific equipment and laboratories, helicopters, ski-equipped airplanes, surface vehicles, a wide array of additional research facilities and temporary (usually summer) camps, a research icebreaker, and an ice-strengthened research ship. These facilities are operated by NSFs Division of Antarctic Infrastructure and Logistics (703-292-8032) through several support contracts and through agreements with other Federal agencies. The U.S. Antarctic Program includes many organizations that provide logistical and operational support to meet the needs of the field research program. NSFs prime Antarctic logistics contractor, Raytheon Polar Services Company (RPSC) of Centennial, Colorado, coordinates research support and field operations in Antarctica and has a planning group that can assist investigators with questions about field or logistical support. Investigators are strongly ...
ENSO causes climate extremes across and beyond the Pacific Basin, however evidence of ENSO at high southern latitudes is generally restricted to the South Pacific and West Antarctica. Here we report a statistically significant link between ENSO and sea salt deposition during summer from the Law Dome (LD) ice core in East Antarctica. ENSO-related atmospheric anomalies from the central-western Equatorial Pacific (CWEP) propagate to the South Pacific and the circumpolar high latitudes. These anomalies modulate high latitude zonal winds, with El Niño (La Niña) conditions causing reduced (enhanced) zonal wind speeds and subsequently, reduced (enhanced) summer sea salt deposition at LD. Over the last 1010 years, the LD summer sea salt (LDSSS) record has exhibited two below average (El Niño-like) epochs, 1000-1260 AD and 1920-2009 AD, and a longer above average (La Niña-like) epoch from 1260-1860 AD. Spectral analysis shows the below average epochs are associated with enhanced ENSO-like variability ...
In 2019 we were commissioned by the Australian Antarctic Division to create a 6DoF (six degrees of freedom) system that was compact enough to fit into and dive vertically down through a 40cm diameter hole cut into the Antarctic sea ice.. ...
Up at 4am and in the car heading for Vestfold to the south west of Oslo. First stop at 0530 was Borrevannet where at least 2 Spotted Crakes have been singing for the past week or so. Maybe they have gone, maybe it was too late in the day (they usually sing at night) or most likely it was too cold (with a northerly wind blowing it was only about 4C first thing). Anyway no sign of them and little else. Highlights were 2 singing Redstarts, a singing Pied Flycatcher and a male Marsh Harrier. A couple of Rooks seen in the nearby town of Horten were new for the year and come from the colony in the town which I believe is the only colony in southern Norway ...
Under The Antarctic Treaty, Australia and other nations which operate in Antarctica have a responsibility to conserve and protect Antarcticas unique environment. Through the Protocol on Environmental Protection to the Antarctic Treaty, adopted in 1991, the Contracting Parties "commit themselves to the comprehensive protection of the Antarctic environment and dependent and associated ecosystems". Research undertaken by the University of Wollongong over more than 20 years has had a significant and wide-reaching impact on Australias environmental, economic, legal and political responsibilities and leadership role in Antarctica. Monitoring and management: UOW research outcomes have informed Antarctic Environmental Managers on the health of Antarctic terrestrial and near shore ecosystems, highlighting which species may be at risk from climate change or disturbance from Antarctic station activities. I have provided expert advice to AAD Environmental Managers on proposed activities around Antarctic ...
The first is our incredible record-breaking Arctic Tern, that was tagged last year by Dr Chris Redfern and Dr Richard Bevan from Newcastle University. They attached Geo-locators to some of our Arctic Tern last spring, in the hope of tracking their movements over their amazing migrations. We werent prepared for just how amazing it would turn out to be though. It doesnt seem that long ago that we were celebrating as the first logger was spotted on a returning bird! Once the logger was retrieved a few weeks later it revealed the bird had travelled from the Farne Islands to Antarctica, via West Africa and then back again via the Kerguelen Islands and the Indian Ocean. This bird made a phenomenal 96,000k round trip, the longest migration of any bird ever recorded. Now affectionately know as Arctic Tern number 91 thanks to the monitoring stone allocated to it, we will keep you up-to-date with how the breeding season goes for this special bird. We are now happy to report that the pair have hatched 2 ...
Proposals received by NSF are assigned to the appropriate NSF program for acknowledgement and, if they meet NSF requirements, for review. All proposals are carefully reviewed by a scientist, engineer, or educator serving as an NSF Program Officer, and usually by three to ten other persons outside NSF either as ad hoc reviewers, panelists, or both, who are experts in the particular fields represented by the proposal. These reviewers are selected by Program Officers charged with oversight of the review process. Proposers are invited to suggest names of persons they believe are especially well qualified to review the proposal and/or persons they would prefer not review the proposal. These suggestions may serve as one source in the reviewer selection process at the Program Officers discretion. Submission of such names, however, is optional. Care is taken to ensure that reviewers have no conflicts of interest with the proposal. In addition, Program Officers may obtain comments from site visits ...
UFO hunters are convinced that not only did the Nazis built secret bases on the north and south pole but that there are several bases on Antarctica that were used not only by humans but by otherworldly visitors as well.. The massive Antarctica anomaly encompasses a distance of nearly 250 kilometers across and reaches a maximum depth of 850 meters below the surface.. The anomaly was discovered in an area known as Wilkes Land on Antarctica.. Speaking about the discovery, Secureteam10 says: To this day, scientists have no idea or way to discover exactly what is buried deep under this thick ice shelf. This continent has been shrouded in a mystery of its own for years now.. There is some evidence of this coming to light in recent years, with images purporting to show various entrances built into the side of mountains, with a saucer shape and at a very high altitude. This begs the question: how would you enter these entrances without something that could fly and was the same shape as the hole ...
Victoria University of Wellington This thesis presents an integrated analysis of late Cenozoic (last 14 Ma) glacimarine stratigraphy within the Terror Rift in southern McMurdo Sound, Antarctica. The study area is located in the Windless Bight region of the McMurdo Ice Shelf (NW corner of the Ross Ice Shelf), which overlies a 600 to 1000 m-deep bathymetric moat surrounding Ross Island in the depocentral axis of the Victoria Land Basin (VLB). The VLB, one of a number of extensional sedimentary basins within the West Antarctic Rift System, comprises a 7-km-thick succession of syn- and post-rift glacimarine sediments that accumulated during the Oligocene and Miocene periods, respectively. Renewed rifting, known as the Terror Rift, in the centre of the VLB began between 17 to 14 Ma and has accommodated as much as one third of the entire Cenozoic basin-fill. The development of rift-related alkalic volcanoes associated with the Erebus Volcanic Province from c. 5 Ma has produced localised flexural ...
Mangold, A., Q. Laffineur, A. Delcloo, V. De Bock, C. Hermans, F. Hendrick, P. Herenz, H. Wex, A. Gossart, N. Souverijns, N. van Lipzig, I. Gorodetskaya, and H. De Backer, Atmospheric aerosol characterisation and relations to clouds and precipitation in Dronning Maud Land, East Antarctica, European Aerosol Conference 2019 Abstract O10_F1_A05, 25-30 August, Gothenburg, Sweden, 2019 ...
Less than 1 percent of the world's oceans are set aside as protected areas, but diplomats meeting now in Australia could substantially increase that
For residents of the United States - and indeed, the entire Northern Hemisphere - the impact of major ice loss from Antarctica could be dire. If Antarctica loses volumes of ice that would translate into major contributions to sea level rise, that rise would not be distributed evenly around the globe. The reason is the force of gravity. Antarctica is so massive that it pulls the ocean toward it, but if it loses ice, that gravitational pull will relax, and the ocean will slosh back toward the Northern Hemisphere - which will experience additional sea level rise. ...
...Lake Bonney in Antarctica is perennially covered in ice. It is exposed... Our laboratory has a focus on understanding adaptations in extreme en...Despite being microscopic these organisms may play a big role in glob...Moreover it is not known how the climate effects this metabolic switc...,Research,on,carbon-consuming,life-forms,in,Antarctica,published,in,JoVE,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters
On the eve of a historic 11-day meeting celebrating the 50th anniversary of the Antarctic Treaty, the Pew Environment Group encouraged diplomats, polar scientists and non-governmental organizations to redouble their efforts to protect polar regions from the impact of climate change. The Antarctic Treaty Consultative Meeting (ATCM) is the major annual diplomatic event related to Antarctica. Secretary of State Hillary Clinton will open this first multilateral meeting hosted by the Obama administration, which occurs at a time when both poles are issuing alarms about global warming. Immediately preceding the official start of the ATCM, the Antarctic Treatys Committee on Environmental Protection and the Science Committee of the Commission for the Conservation of Antarctic Marine Living Resources met for the first time, on April 3 and 4. The two groups discussed ways to achieve closer coordination and collaboration in their efforts to address the serious impact of climate change on marine resources ...
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Antarctic Fur Seal photo, Arctocephalus gazella photograph, stock photo of an Antarctic Fur Seal, image #24392, by Professional Natural History Photographer Phillip Colla / Oceanlight.com
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Our 2017 Alaska INBRE retreat is now over, sad but true. We had 17 Graduate and Undergraduate Research Assistants present posters in our three One Health Categories; environmental, animal, and human health. Three GRAs and one URA were awarded full cost travel awards to attend the 2017 NIH IDeA Western Regional Conference in Jackson Hole, Wyoming.. URA:. Shannon Medlock (UAA) - Milk Microbiota of the Arctic Ground Squirrel. GRA:. Alex Francian (UAA) - Enhancing Tumor Antigen Presentation with Complement Targeted Liposomes. Karen Carlson (UAA) - Urea-Nitrogen Salvage and Ureolytic Microbes in the Arctic Ground Squirrel Gut. Anna Rix (UAF) - Probing the Hypoxic Response of Antarctic Notothenioid Fishes. ...
The fossil record of pinnipeds is heavily biased toward the northern hemisphere - and the north Pacific record is particularly densely sampled. One of the most famous north Pacific pinnipeds is the smelly, gigantic, bizarre, violent, and utterly charismatic elephant seal (Mirounga angustirostris). Its one of only two temperate latitude true seals in the eastern North Pacific, aside from the harbor seal. Whereas the closest relatives of harbor seals all live in the North Pacific, North Atlantic, and Arctic, the closest relatives of northern elephant seals (southern elephant seal, Mirounga leonina, and other lobodontines) are all in the southern ocean - making their evolutionary history a bit of a puzzle. Modern biogeography suggests that the modern northern elephant seal originated in the southern hemisphere with other lobodontines (antarctic seals). Unfortunately, the fossil record of elephant seals is a bit crap; fragmentary specimens indicate the presence of modern species in the mid-late ...
Acuña, H.O. and Francis, J.M. 1995. Spring and summer prey of the Juan Fernández fur seal, Arctocephalus philippii. Canadian Journal of Zoology 73(8): 1444-1452.. Aguayo, L.A. 1979. Juan Fernández fur seal. In: Mammals in the Seas, Vol. II: Pinniped species summaries and report on sirenians, pp. 28-30. Food and Agriculture Organization of the United Nations, Rome, Italy.. Avila, C.I., Alava, J.J. and Galvis Rizo, C.A. 2014. On the presence of a vagrant Juan Fernández fur seal (Arctocephalus philippii) in the Pacific coast of Colombia: a new extralimital record. Maztozoología Neotropical 21(1): 109-114.. Bahamonde, N. 1966. El Mar y sus recursos. In:Económica de Chile: Primer Apéndice, pp. 81-90. CORFO, Santiago, Chile.. Bernardi, G., Fain, S.R., Gallo-Reynoso, J.P., Figueroa-Carranza, A.L. and Le Boeuf, B.J. 1998. Genetic variability in Guadalupe fur seals. Journal of Heredity 89: 301-305.. Berta, A. and Churchill, M. 2012. Pinniped taxonomy: review of currently recognized species and ...
The last glacial period exhibited abrupt Dansgaard-Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeodimate archives. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard-Oeschger cycle and vice versa, suggesting an interhemispheric redistribution of heat through a mechanism called the bipolar seesaw(4-6). Variations in the Atlantic meridional overturning circulation (AMOC) strength are thought to have been important, but much uncertainty remains regarding the dynamics and trigger of these abrupt events. Key information is contained in the relative phasing of hemispheric climate variations, yet the large, poorly constrained difference between gas age and ice age and the relatively low resolution of methane records from Antarctic ice cores have so far precluded methane-based synchronization at the required sub-centennial precision". Here we use a recently drilled high-accumulation Antarctic ice core ...
Other instruments flying include the Multichannel Coherent Radar Depth Sounder from the University of Kansas, which measures ice sheet thickness and the varied terrain below the ice. The Laser Vegetation Imaging Sensor, developed at NASAs Goddard Space Flight Center in Greenbelt, Md., maps large areas of sea ice and glacier zones. A gravimeter from Columbia Universitys Lamont-Doherty Earth Observatory in Palisades, N.Y., will give scientists their first opportunity to measure the shape of the ocean cavity beneath floating ice shelves in critical spots of Antarctica. A University of Kansas snow radar will measure the thickness of snow on top of sea ice and glaciers. NASAs Langley Research Center in Hampton, Va.; NASAs Ames Research Center in Moffett Field, Calif.; and the University of North Dakota in Grand Forks also are providing support for the campaign. NASA also is funding complementary airborne surveys as part of Operation Ice Bridge, including surveys of Alaskan glaciers by scientists ...
Antifreeze proteins (AFPs) enhance the survival of organisms inhabiting cold environments by affecting the formation and/or structure of ice. We report the crystal structure of the first multi-domain AFP that has been characterized. The two ice binding domains are structurally similar. Each consists of an irregular β-helix with a triangular cross-section and a long α-helix that runs parallel on one side of the β-helix. Both domains are stabilized by hydrophobic interactions. A flat plane on the same face of each domains β-helix was identified as the ice binding site. Mutating any of the smaller residues on the ice binding site to bulkier ones decreased the antifreeze activity. The bulky side chain of Leu174 in domain A sterically hinders the binding of water molecules to the protein backbone, partially explaining why antifreeze activity by domain A is inferior to that of domain B. Our data provide a molecular basis for understanding differences in antifreeze activity between the two domains of this

Rural and Remote Health Journal - View ArticleRural and Remote Health Journal - View Article

The circumpolar regions of the world include the areas in and around the Arctic and Antarctic circles. In the north, countries ... For the Antarctic region, resident numbers are small so studies tend to be descriptive or qualitative. In some instances human ... Figure 1: Map showing the Arctic Circle and a boundary of the circumpolar Arctic region as defined by the Arctic Human ... Harris A, Marquis P, Eriksen H, Grant I, Corbett R, Lie SA, Ursin H. Diurnal rhythm in British Antarctic personnel. Rural and ...
more infohttp://www.rrh.org.au/articles/subviewnew.asp?ArticleID=1534

Publications | Natural History Museum of Los AngelesPublications | Natural History Museum of Los Angeles

Contributions in Science, Number 90 - Lavenberg: Normichthys yahganorum, a New Searsiid Fish from Antarctic Waters (. , 2 MB) ... Contributions in Science, Number 105 - Vaughn: Comparison of the Early Permian Vertebrate Faunas of the Four Corners Region and ... Contributions in Science, Number 491 - Fitzhugh: Antarctic Fanworms (. , 0.6 MB). *Contributions in Science, Number 490 - ... Contributions in Science, number 276 - Matson: The Distribution of Rodents in Owens Lake Region (. , 3 MB) ...
more infohttps://nhm.org/site/research-collections/research-tools/publications

Effects of ultraviolet radiation and temperature on the antioxidative status of two Enteromorpha (Chlorophyta) species from...Effects of ultraviolet radiation and temperature on the antioxidative status of two Enteromorpha (Chlorophyta) species from...

... species from Antarctic and Subantarctic regions , Conference of the German Botanical Society, 5-10 Sept., Braunschweig, Germany ...
more infohttp://epic.awi.de/12290/

Antarctic Postcard from the Field: Antarctic Gateway - Windows to the UniverseAntarctic Postcard from the Field: Antarctic Gateway - Windows to the Universe

The Antarctic Region. What Will You Find There? South of the Antarctic Circle (at 66.5 S latitude) you will find the continent ... Antarctic Gateway. Hello,. We were able to get to McMurdo Station in Antarctica pretty quickly: we left the States on December ... Antarctica is almost entirely south of the Antarctic Circle...more. En Route to Antarctica - First Stop New Zealand. Hello ...
more infohttps://www.windows2universe.org/people/postcards/pineisland/bob_bindschadler_12_18_0.html&edu=high

Antarctic Marine Life - Windows to the UniverseAntarctic Marine Life - Windows to the Universe

The Antarctic Region. What Will You Find There? If you travel to the South Pole, you will find the continent of Antarctica ... Earths Polar Regions Postcards from the Field: Antarctica Warmer Temperatures are Changing Antarctic Phytoplankton ... Three examples of marine life in the Antarctic: Seals and krill live in the Southern Ocean. Penguins live on the Antarctic ... Antarctic Marine Life The chilly waters of the Southern Ocean are home to many different animals including eight types of ...
more infohttps://www.windows2universe.org/earth/polar/antarctic_marine_life.html&edu=elem

May 11, 1901 - Scientific AmericanMay 11, 1901 - Scientific American

Table-Glaciers of the Antarctic Regions. The Great Salt Lake. Living Millstones. ...
more infohttps://www.scientificamerican.com/magazine/supplements/1901/05-11/

real life map collection • mapperyreal life map collection • mappery

Antarctic Region Political Map 1997. Map centered on South Pole shows all country claims in Antarctica. Also shows year-round ... Ross Sea Regions Map. Physical relief map of the Ross Sea regions. Shows Victoria Land, Ross Sea, McMurdo Sound, Ross Ice... ... Antarctic Peninsula Map. Shows stations and named geographic features of the Antarctic Peninsula. Scanned. ... Antarctic Automatic Weather Stations Map. Map of all automatic weather stations in Antarctica ...
more infohttp://www.mappery.com/tags.php?tag=reference&nearestto=5310

Research topic  Ocean-atmosphere interactions - Publication - British Antarctic SurveyResearch topic Ocean-atmosphere interactions - Publication - British Antarctic Survey

Seasonal variability of mesocyclone activity in the Bellingshausen/Weddell region of Antarctica. 1 January, 1996 ... A new study has found for the first time that ocean warming is the primary cause of retreat of glaciers on the Antarctic ... The simulation of Antarctic sea ice in the Hadley Centre Climate Model (HadCM3). 1 January, 2001 ... Antarctic sea ice increase consistent with intrinsic variability of the Amundsen Sea Low. 1 April, 2016 ...
more infohttps://www.bas.ac.uk/science/research-topic/atmospheric-physics-chemistry/ocean-atmosphere-interactions/

Table of Contents - December 13, 1929, 70 (1824) | ScienceTable of Contents - December 13, 1929, 70 (1824) | Science

SCIENTIFIC STUDY IN THE ARCTIC AND ANTARCTIC REGIONS. Science. 13 Dec 1929. : 573-574 Full AccessRestricted Access ...
more infohttp://science.sciencemag.org/content/70/1824

Climate related iceberg activity has massively altered life on the seabedClimate related iceberg activity has massively altered life on the seabed

Researchers from the British Antarctic Survey have found evidence that climate change has fundamentally altered the way that ... life functions on an Antarctic seabed. A once diverse and complex biological system has become simplified ... ... Global warming affects Artic and Antarctic regions differently. February 18, 2013 (Phys.org)-The robustness of food webs of ... June 17, 2014, British Antarctic Survey An iceberg seen in front of western Adelaide Island. Credit: British Antarctic Survey ...
more infohttps://phys.org/news/2014-06-climate-iceberg-massively-life-seabed.html

Low reproductive success in territorial male Antarctic fur seals (Arctocephalus gazella) suggests the existence of alternative...Low reproductive success in territorial male Antarctic fur seals (Arctocephalus gazella) suggests the existence of alternative...

Microsatellites were used to conduct an analysis of paternity of Antarctic fur seals (Arctocephalus gazella) from Bird Island, ... Antarctic Regions. Female. Fur Seals / genetics*, physiology. Genetics, Population. Haplotypes / genetics. Male. Microsatellite ... To explain this discrepancy we suggest that female choice is an integral component of the Antarctic fur seal mating system and ... Microsatellites were used to conduct an analysis of paternity of Antarctic fur seals (Arctocephalus gazella) from Bird Island, ...
more infohttp://www.biomedsearch.com/nih/Low-reproductive-success-in-territorial/11298959.html

CIA - The World Factbook 2002 -- South Georgia and the South Sandwich IslandsCIA - The World Factbook 2002 -- South Georgia and the South Sandwich Islands

Antarctic Region Area:. total: 3,903 sq km note: includes Shag Rocks, Black Rock, Clerke Rocks, South Georgia Island, Bird ... Today, the station houses scientists from the British Antarctic Survey. The islands have large bird and seal populations and, ... stranded off the Antarctic Peninsula. He died in 1922 on a subsequent expedition and is buried in Grytviken. ... to be replaced by a permanent group of scientists of the British Antarctic Survey, which also has a biological station on Bird ...
more infohttp://www.faqs.org/docs/factbook/geos/sx.html

Difference image analysis of defocused observations with CSTAR (Journal Article) | SciTech ConnectDifference image analysis of defocused observations with CSTAR (Journal Article) | SciTech Connect

79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTARCTIC REGIONS; APERTURES; DATA ANALYSIS; FAILURES; FILTERS; IMAGE PROCESSING; ... Chinese Center for Antarctic Astronomy, Nanjing (China). *Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing ( ... out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter ...
more infohttps://www.osti.gov/scitech/biblio/22342131-difference-image-analysis-defocused-observations-cstar

Find BGS datasets by browsing an A to Z list of keywordsFind BGS datasets by browsing an A to Z list of keywords

Antarctic regions (1). Apatite (2). Aquifer properties (3). Aquifers (22). Archaean (1) ...
more infohttps://www.bgs.ac.uk/discoverymetadata/keywords.html

A. Jonathan Shaw, Professor of Biology and Curator of Bryophytes, Duke HerbariumA. Jonathan Shaw, Professor of Biology and Curator of Bryophytes, Duke Herbarium

Adenosine Kinase • Algal Proteins • Alleles • Amplified Fragment Length Polymorphism Analysis • Antarctic Regions • Arabidopsis ... Acutifolia (Sphagnaceae) from boreal and arctic regions of North America, Phytotaxa, vol. 333 no. 1 (January, 2018), pp. 1-1, ...
more infohttp://fds.duke.edu/db/aas/Herbarium/brophytes/shaw

Drr | BMKGDrr | BMKG

WMO Release : WMO verifies highest temperatures for Antarctic Region. *02 Mar 2017 ... All information about Weather Forecast, Climate, Air Quality, and the Earthquake that occurred in all regions in Indonesia is ...
more infohttp://www.bmkg.go.id/tag/?tag=drr&lang=EN

National Snow and Ice Data CenterNational Snow and Ice Data Center

Limited Arctic/Antarctic regions. Global. Global. Spatial Coverage (Gridded). NSM EASE-Grids. NSM EASE-Grids. NSM EASE-Grids. ... In the equatorial regions of the EASE2-T grids, ltod is equivalent to division by ascending vs. descending passes, ... 2018, National Snow and Ice Data Center :: Advancing knowledge of Earths frozen regions ...
more infohttp://nsidc.org/data/nsidc-0630?qt-data_set_tabs=1

Search Results | Oxford ArtSearch Results | Oxford Art

Antarctic region (36) * South Georgia and the South Sandwich Islands (36) * [[missing key: search-facet.tree.open-section]] ...
more infohttp://www.oxfordartonline.com/search?siteToSearch_0=BEN

A model of the glacial retreat of upper Rennick Glacier, Victoria Land, AntarcticaA model of the glacial retreat of upper Rennick Glacier, Victoria Land, Antarctica

In Ricci, C. A., ed. The Antarctic region: geological evolution and processes. Siena, Museo Nazionale dellAntartide, 297-304 ... Antarctic Research Series 46.) Denton, G H., Sugden, D. E., Marchant, D. R., Hall, B. L. and Wilch, T. I.. 1993. East Antarctic ... Global change, Antarctic meteorite traps and the East Antarctic ice sheet. J. Glacial, 39(132), 397-408. ... Modern and Holocene aeolian dust variability from Talos Dome (Northern Victoria Land) to the interior of the Antarctic ice ...
more infohttps://www.cambridge.org/core/journals/annals-of-glaciology/article/model-of-the-glacial-retreat-of-upper-rennick-glacier-victoria-land-antarctica/2F1238841CF23891E43591CE8AFBF82B/core-reader

The first record of fossil penguins from East Antarctica | Antarctic Science | Cambridge CoreThe first record of fossil penguins from East Antarctica | Antarctic Science | Cambridge Core

The Antarctic region: geological evolution and processes. Siena: Terra Antarctica, 977-984. ... The Pagodroma Group - a Cenozoic record of the East Antarctic ice sheet in the northern Prince Charles Mountains. Antarctic ... Antarctic Science, 16, 83-99.. Whitehead, J.M., Harwood, D.M., McKelvey, B.C., Hambrey, M.J.McMinn, A. 2004. Diatom ... Antarctic Research Series, 76, 359-364.. Ksepka, D.T.Thomas, D.B. 2012. Multiple Cenozoic invasions of Africa by penguins (Aves ...
more infohttps://www.cambridge.org/core/journals/antarctic-science/article/div-classtitlethe-first-record-of-fossil-penguins-from-east-antarcticadiv/A6BE71B9EB56201E191CD473C09B12EA

Significant Warming of the Antarctic Winter Troposphere «  RealClimateSignificant Warming of the Antarctic Winter Troposphere « RealClimate

Does the Antarctic region experience this? I didnt see any mention of inversion layers or unambiguous stratification evidence ... The "iconic" Antarctic temperature trends are the large warming seen on the Antarctic Peninsula, which has had various ... Significant Warming of the Antarctic Winter Troposphere. Filed under: *Arctic and Antarctic ... Our answer to that is not to trust MSU in these regions; I understand that Christy disagrees on that. This too will be an ...
more infohttp://www.realclimate.org/index.php/archives/2006/03/significant-warming-of-the-antarctic-winter-troposphere/

Antarctic Organisms and Ecosystems - News | NSF - National Science FoundationAntarctic Organisms and Ecosystems - News | NSF - National Science Foundation

Krill hotspot fuels incredible biodiversity in Antarctic region. News From the Field ... Antarctic Organisms and Ecosystems - News. Filter News by News Type and Research Area. Get News Updates by Email or by Get ... In Antarctic dry valleys, early signs of climate change-induced shifts in soil ... Extreme melt season leads to decade-long ecosystem changes in Antarctic polar desert ...
more infohttps://nsf.gov/news/index.jsp?pims_id=13421&org=NSF

Residues of persistent organochlorine contaminants in southern elephant seals (Mirounga leonina) from Elephant Island,...Residues of persistent organochlorine contaminants in southern elephant seals (Mirounga leonina) from Elephant Island,...

Antarctic Regions. Environmental Exposure / analysis*. Environmental Monitoring. Female. Food Chain. Hydrocarbons, Chlorinated ... or in the recent past in countries in the southern hemisphere are the sources of contamination in the Antarctic region. Data ... from Elephant Island in the Antarctic Peninsula. All residues of persistent organochlorine contaminants analyzed were found in ...
more infohttp://www.biomedsearch.com/nih/Residues-persistent-organochlorine-contaminants-in/17612156.html

Cumacea - WikispeciesCumacea - Wikispecies

Lomakina, N., (1968). Cumacea of the Antarctic region. Studies of Marine Fauna 6(14): 97-140. ... National Antarctic Expedition. Natural History 2: 1-6.. *Calman, W. T., (1907b). Sur quelques Cumacés de côtes de France. ... Fish, C.J., (1925). Seasonal distribution of the plankton in the Woods Hole Region. Bulletin of the United States Bureau of ... Antarctic Science 10(1): 3-11.. *Brandt, A., W. Brökeland, B. Hilbig, U. Mühlenhardt-Siegel, M. Raupach, G. Strieso, & G. ...
more infohttps://species.wikimedia.org/wiki/Cumacea
  • The Antarctic shore is a place of huge contrasts, as quiet, dark, and frozen winters give way to bright, clear waters, thick with algae and peppered with drifting icebergs in summer. (phys.org)
  • To explain this discrepancy we suggest that female choice is an integral component of the Antarctic fur seal mating system and that aquatic mating may play a much larger role in the Antarctic fur seal than previously thought. (biomedsearch.com)
  • Global environmental change is altering natural and built systems in many regions of the world and such changes play a significant role in an emerging travel trend that has been labelled 'last chance tourism' (LCT). (ucalgary.ca)
  • The Chinese Small Telescope ARray carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008-2010. (osti.gov)
  • Since 1984 when cruises began in this region, cruise ship activity has been sporadic, but in 2006 the number of cruises to Nunavut doubled from 11 to 22. (ucalgary.ca)