Specification of the germ line is an essential event during the embryonic development of sexually reproducing animals, as germ line cells are uniquely capable of giving rise to the next generation. Animal germ cells arise through either inheritance of a specialized, maternally supplied cytoplasm called germ plasm or though inductive signaling by somatic cells. Our understanding of germ cell determination is based largely on a small number of model organisms. To better understand the evolution of germ cell specification, we are investigating this process in the amphipod crustacean Parhyale hawaiensis. Experimental evidence from previous studies demonstrated that Parhyale germ cells are specified through inheritance of a maternally supplied cytoplasmic determinant; however, this determinant has not been identified. Here we show that the one-cell stage Parhyale embryo has a distinct cytoplasmic region that can be identified by morphology as well as the localization of germ line-associated RNAs. Removal
The talitrid amphipod Talitrus saltator has a wide distribution along European Atlantic and Mediterranean sandy shores. Previous research had estimated genetic differences among populations with iso-enzyme electrophoresis, as well as differences in behavioural adaptation related to ecological features. In this study morphometric differences among four Mediterranean (Italian coasts) and three Atlantic (Portuguese and Welsh coasts) populations were estimated, which may give information on population dynamics and adaptability to environmental constraints. The localities chosen differed with regard to the following characteristics: sheltered/exposed shorelines, tidal/non-tidal shores, presence/absence of detritus, Atlantic/Mediterranean climate, high/low human frequentation. Samples of each population were collected in a standardized way and fresh individuals were weighed, their body lengths and eye diameters were measured, and the number of eggs in the female brood-pouches and the articles of each antenna
Horton, T.; De Broyer, C. (2013). Gammarida. In: Horton, T.; Lowry, J.; De Broyer, C.; Bellan-Santini, D.; Coleman, C. O.; Corbari, L.; Daneliya, M.; Dauvin, J-C.; Fišer, C.; Gasca, R.; Grabowski, M.; Guerra-García, J. M.; Hendrycks, E.; Hughes, L.; Jaume, D.; Jazdzewski, K.; Kim, Y.-H.; King, R.; Krapp-Schickel, T.; LeCroy, S.; Lörz, A.-N.; Mamos, T.; Senna, A. R.; Serejo, C.; Sket, B.; Souza-Filho, J. F.; Tandberg, A.H.; Thomas, J.; Thurston, M.; Vader, W.; Väinölä, R.; Vonk, R.; White, K.; Zeidler, W. (2018). World Amphipoda Database. Accessed at http://www.marinespecies.org/amphipoda/aphia.php?p=taxdetails&id=236816 on 2018-01- ...
The genus Gammarus (Amphipoda) is one of the most speciose genera of Crustacea, yet much uncertainty remains concerning taxonomy and systematic relationships, particularly for brackish and marine forms. We used DNA barcode sequences from the mitochondrial cytochrome c oxidase I (COI) gene to probe the taxonomy of prominent members of marine and brackish water Gammarus of the North Atlantic, Baltic, Mediterranean and Black Seas. We investigated 16 putative Gammarus spp. at an average number of 9 specimens per species. This constitutes the most taxonomically and geographically comprehensive molecular study of marine Gammarus to date. Average between-species sequence divergence (26.8%) was much higher than intraspecific distances (0.8%), enabling clear molecular species identification and highlighting several possible misidentifications from previously published studies. Specimens of Gammarus aequicauda and G. insensibilis from the Black Sea were at least 14% distant from their putative ...
Juvenile specimens of the scavenging amphipod Pseudocallisoma coecum (Holmes, 1908) were recorded near the bases of the oral arms of the jellyfish Poralia rufescens Vanhöffen, 1902 in the Japan Trench. Video footage and sampling imply a high infection rate of Poralia, with one to six amphipod specimens occurring on each P. rufescens individual. The hyperiidean amphipod Lanceola clausi clausi Bovallius, 1885 was also found to infect P. rufescens.
Myanmarorchestia victoria sp. nov. (Crustacea, Amphipoda, Talitridae), a new species of landhopper from the high altitude forests in Myanmar
Amaryllis macrophthalma (Amaryllis/Amaryllididae/Amphipoda/Malacostraca/Arthropoda/Animalia), HMS Challenger (1872-76), Microscope slide
1. An apparatus is described for testing substrate-depth preferences of Corophium volutator (Pallas).. 2. Corophium burrow in mud whatever its depth, if only one depth of mud is available.. 3. If presented with muds of different depths, more animals burrow in the deeper muds. Very shallow muds, of 0.5 cm. depth, are particularly avoided.. 4. Although preferring deeper muds, animals are persuaded to burrow in shallow muds when the surface population density in the deeper muds is at a high level (, 0.1 animals/cm.2). This would be explained by a pattern of territorial behaviour which shows itself only at relatively high population densities.. 5. Analysis of the distribution of animals at low densities indicates some tendency towards gregariousness.. 6. Because of the periodic tendency for animals to vacate their burrows and burrow elsewhere, more than 50% of burrows at very low surface-population densities (ca. 0.01 animals/cm.2) may be unoccupied.. 7. Larger animals tend to be found in deeper ...
Gammarus pulex were sampled from five English streams during April 1992. The population density, number of precopula pairs and incidence of parasitic infection were recorded, and the biomass was estim
Dikerogammarus haemobaphes is a Ponto-Caspian gammarid that has invaded vast areas in Central and Western Europe. Our paper is a first presentation of its life history features in an invaded region. T
GAMMARUS (250ml tub) dried freshwater shrimps for turtles, tortoises, and large ornamental fish. Gammarus pulex are tiny crustaceans (around 2-3 cm) of the order Amphipoda. GAMMARUS are a major element in the diet of fish in the wild. | eBay!
article{2094443, author = {Nguyen Thi Hong, Lien and Muyssen, Brita and Janssen, Colin}, issn = {0045-6535}, journal = {CHEMOSPHERE}, keyword = {Hyalella azteca,Zinc,Sediment toxicity,Dietary exposure,Selective feeding,ACID VOLATILE SULFIDES,SIMULTANEOUSLY EXTRACTED METALS,FRESH-WATER INVERTEBRATES,TOXICITY TESTS,BOUND METALS,NEANTHES-ARENACEODENTATA,AQUATIC INVERTEBRATES,REPRODUCTIVE TOXICITY,AVOIDANCE-RESPONSE,SPIKED SEDIMENTS}, language = {eng}, number = {1}, pages = {84--90}, title = {Single versus combined exposure of Hyalella azteca to zinc contaminated sediment and food}, url = {http://dx.doi.org/10.1016/j.chemosphere.2011.11.066}, volume = {87}, year = {2012 ...
Ericthonius latimanus Ledoyer 1986: 625-628, fig. 238a .. Ericthonius ledoyeri J.L. Barnard & Karaman 1991: 189.. Material. This species is recorded here for the first time in South Africa. It was found in October 2009 in Sodwana Bay, northern KwaZulu-Natal, in algal turfs on Two-Mile Reef, at 22 m depth and is depositied in the Iziko South African Museum under catalogue number SAM A48148.. Remarks. This species was known previously from Madagascar and Mauritius. E. ledoyeri differs from E. brasiliensis and E. pugnax mainly in the form of gnathopod 2: E. ledoyeri having a distinct palm on article 6, and a series of spines on the lower margin of the expanded tooth of article 5. Pereiopod 3 also differs between the species of this genus, having an ovoid article 2 in E. ledoyeri, as opposed to E. brasiliensis, where it is quadrate and E. pugnax, where it has a distinct lobe.. Ericthonius pugnax Dana, 1852, new record. Ericthonius pugnax Ledoyer 1986: 628, fig. 239.. Material. Collected in 1995 from ...
This paper is the first of a series of four, it describes the general outline of a research project on the ecology of Gammarus pulex pulex (Linnaeus, 1758), G. fossarum Koch in Panzer, 1836, and Echinogammarus berilloni (Catta, 1878) in a small French chalk stream, the Slack. The entire study investigates the impact of (changes in) environmental factors on standing crop and migration of these three freshwater gammarids. An account is given of biological and physicochemical research methods used. Special methods to capture both drifting and upstream migrating gammarids were developed. In this first part, data on environmental factors are presented with an emphasis on the seasonal and microgeographic variation they show in this river. Detailed information about the diel variation of some environmental factors is given. After mathematical treatment of the data on environmental factors the Slack is classified in four zones: an unstable headwater, a large stable upper/middle region, a rather polluted ...
Zoological Science publishes articles, reviews and editorials that cover the broad and increasingly interdisciplinary field of zoology.
Three species of the amphipod genus Syrrhoe are described from the North Atlantic. The differences between these species are primarily the patterns of serration of the posterior margins of pleonite 3 and urosomite 1 and 2: Syrrhoe affinis has a wide convex space on the posterior margin between the epimeron 3 and the dorsal serration. In Syrrhoe crenulata and Syrrhoe anneheleneae sp. nov. there is only a small notch on the posterior margin of pleonite 3. Syrrhoe anneheleneae sp. nov., otherwise similar to S. crenulata, has an additional serration on the posterior margin of urosomite 1. The inter- and intraspecific distances analyzed from COI confirm the morphological species concept of North Atlantic Syrrhoe.
Migration of Gammarus pulex pulex (Linnaeus, 1758), G. fossarum Koch in Panzer, 1836, and Echinogammarus berilloni (Catta, 1878) has been studied in a small French chalk stream, the Slack. Three different approaches to investigate both up- and downstream migration were used: (1) migration survey, with a sampling program of migration at intervals of two weeks or a month at twelve localities in the river Slack; (2) continuous measurement of migration at three habitats with very stable, normal and very unstable environmental conditions, respectively, lying within 100 m of one another and populated by the same species, G. fossarum; (3) finally, marking experiments in order to identify and trace animals with a given behaviour. Both drift and upstream migration show a considerable microgeographic variation, which is larger for Gammarus than for E. berilloni. During the relatively warm year of 1975, the migration activity of E. berilloni was stronger than in 1974. Upstream migration was concentrated in ...
Temperature is the most pervasive abiotic environmental factor for aquatic organisms. Fluctuations in temperature range lead to changes in metabolic performance. Here, we aimed to identify whether surpassing the thermal preference zones is correlated with shifts in universal cellular stress markers of protein integrity, responses to oxidative stress and lactate content, as indicators of anaerobic metabolism. Exposure of the Lake Baikal endemic amphipod species Eulimnogammarus verrucosus (Gerstfeldt, 1858), Ommatogammarus flavus (Dybowski, 1874) and of the Holarctic amphipod Gammarus lacustris Sars 1863 (Amphipoda, Crustacea) to increasing temperatures resulted in elevated heat shock protein 70 (Hsp70) and lactate content, elevated antioxidant enzyme activities (i.e., catalase and peroxidase), and reduced lactate dehydrogenase and glutathione S-transferase activities. Thus, the zone of stability (absence of any significant changes) of the studied molecular and biochemical markers correlated with the
The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community.
Focusing on feeding as an endpoint in ecotoxicological studies is a useful and sensitive tool to detect sub-lethal impacts on individual organisms with relevance to higher levels of organisation (i.e. population and ecosystem levels). Energy availability depends on feeding [[1],[2]], and the energy budget can be considered an indicator of the overall condition of an organism [[3]]. Feeding determines the health of a population because altered growth and reproduction can be instigated by an effect on feeding [[4]-[7]]. Furthermore, reduced feeding can, at weak levels, reduce the possibility of survival due to interference with further sub-lethal effects and, at strong levels, cause death. Beyond secondary impacts of effects on feeding at the population level, feeding activity can play a direct role at the ecosystem level due to its importance for nutrient cycling.. One group of organisms responsible for a high proportion of the nutrient cycling in freshwaters are detritivores like Gammarus due to ...
This species was previously listed as Extinct based on surveys in the 1980s that did not find any A. australis in the wild (Williams and Barnard 1988). Several surveys since this time have rediscovered small populations of A. australis (Doeg et al. 1996, Papas and Crowther 2007). Austrogammarus australis is listed as Vulnerable under the Victorian government Flora and Fauna Guarantee Act 1988. It has an extent of occurrence (EOO) of 35 km2, an area of occupancy (AOO) of 5 km2 and is found at a single location. It is categorised as Critically Endangered based on this highly restricted range, all of which is threatened by degradation of water quality through pollution and invasive species ...
Re-description of Orchestia stephenseni Cecchini, 1928: designation of neotype and senior synonym to Orchestia constricta A. Costa, 1853 (Crustacea: Amphipoda: Talitridae) by Reversal of Precedence
Polyodra spp. is a small, sedentary, burrowing polychaete worm up to 3 cm long. All Polydora spp. make a U-shaped tube from small particles (Hayward & Ryland, 1995b). Polydora ciliata usually burrows into substrata containing calcium carbonate such as limestone, chalk and clay, as well as shells or oysters, mussels and periwinkles (Fish & Fish, 1996). The sexes are separate and breeding has been recorded in spring in a number of locations. In northern England, it has been recorded to occur from February until June and three or four generations succeed one another during the spawning period (Gudmundsson, 1985). Eggs are laid in a string of capsules that are attached by two threads to the wall of the burrow (Fish & Fish, 1996). After a week the larvae emerge and are believed to have a pelagic life of 2-6 weeks before settling. Length of life is no more than 1 year (Fish & Fish, 1996). Almeda et al. (2009) suggested low filtration rates and low growth rates despite high food availability for ...
WESLAWSKI, J. M., STANEK, A., SIEWERT, A., BEER, N. The Sandhopper (Talitrus saltator, Montagu, 1808) on the Polish Baltic coast. Is it a victim of increased tourism? Oceanological studies. 2000, 29(1), s. 77-87.. This is the first article of a two-part seriesl about the sea and coastal area of the Hel Peninsula, which is located in the Baltic Sea. It provides information about the history of the town and the peninsula, as well as an analysis of the natural habitats of the Hel Peninsula and information about Baltic Sea life. The next section deals with the authors two weeks of field research at the Gdansk University research station in 2013. The results of these research projects will be published in the second part of the series ...
Lowry, J. & Zeidler, W. 2008. Thurstonella, replacement name for the Antarctic amphipod genus Clarencia K.H. Barnard, 1931 (Crustacea, Amphipoda, Thurstonellidae), preoccupied by Clarencia Sloane, 1917 (Insecta, Coleoptera, Carabidae). Zootaxa 1840: 67-68. PDF. ...
Crustaceans possess a diverse array of specialized limbs. Although shifts in Hox gene expression domains have been postulated to play a role in generating this limb diversity, little functional data have been provided to understand the precise roles of Hox genes during crustacean development. We used a combination of CRISPR/Cas9-targeted mutagenesis and RNAi knockdown to decipher the function of the six Hox genes expressed in the developing mouth and trunk of the amphipod Parhyale hawaiensis. These experimentally manipulated animals display specific and striking homeotic transformations. We found that abdominal-A (abd-A) and Abdominal-B (Abd-B) are required for proper posterior patterning, with knockout of Abd-B resulting in an animal with thoracic type legs along what would have been an abdomen, and abd-A disruption generating a simplified body plan characterized by a loss of specialization in both abdominal and thoracic appendages. In the thorax, Ubx is necessary for gill development and for ...
Lowry, J.K. Stoddart, H.E., 2003. Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. In Beesley, P.L. Houston, W.W.K., Editors, Zoological Catalogue of Australia, 19.2B: 1-531. CSIRO Publishing, Melbourne 531pp ...
Lowry, J.K. Stoddart, H.E., 2003. Crustacea: Malacostraca: Peracarida: Amphipoda, Cumacea, Mysidacea. In Beesley, P.L. Houston, W.W.K., Editors, Zoological Catalogue of Australia, 19.2B: 1-531. CSIRO Publishing, Melbourne 531pp ...
A. A. Myers og J. K. Lowry. A phylogeny and a new classification of the Corophiidea Leach, 1814 (Amphipoda). Journal of Crustacean Biology nr 23 (2), 2003, side 443-485. doi:10.1651/0278-0372 ...
Horton, T. (2013). Corophiidira. In: Horton, T.; Lowry, J.; De Broyer, C.; Bellan-Santini, D.; Coleman, C. O.; Corbari, L.; Daneliya, M.; Dauvin, J-C.; Fišer, C.; Gasca, R.; Grabowski, M.; Guerra-García, J. M.; Hendrycks, E.; Hughes, L.; Jaume, D.; Jazdzewski, K.; Kim, Y.-H.; King, R.; Krapp-Schickel, T.; LeCroy, S.; Lörz, A.-N.; Mamos, T.; Senna, A. R.; Serejo, C.; Sket, B.; Souza-Filho, J. F.; Tandberg, A.H.; Thomas, J.; Thurston, M.; Vader, W.; Väinölä, R.; Vonk, R.; White, K.; Zeidler, W. (2018). World Amphipoda Database. Accessed through: Glover, A.G., Higgs, N., Horton, T. (2018). World Register of Deep-Sea species (WoRDSS) at http://www.marinespecies.org/deepsea/aphia.php?p=taxdetails&id=719477 on 2018-01- ...
Anfípodes são pequenos crustáceos com uma distribuição ao longo de todos os habitats marinhos e de água doce. Echinogammarus marinus (Amphipoda, Gammaridae) é uma espécie amplamente distribuída ao longo da costa europeia, sendo o estuário do Mondego (costa oeste de Portugal) considerado o limite sul da sua distribuição. Estudos prévios determinaram que E. marinus é a espécie mais abundante nos habitats intertidais rochosos, tendo um papel crucial na organização trófica do estuário do Mondego. A ocorrência de intersexualidade tem sido largamente descrita em crustáceos, incluindo populações de E. marinus do norte da Europa e mais recentemente no estuário do Mondego. Dado que esta anomalia traz custos associados, como fecundidade e fertilidade reduzidas, baixo sucesso no emparelhamento, maturação retardada e oscilações na proporção de machos/fêmeas, um dos objectivos deste trabalho foi determinar as possíveis consequências da intersexualidade para as populações de ...
Acanthodii (8) Acanthomorpha (17) Acanthomorphata (9) Acariformes (9) Acaromorpha (17) Acoela (2) Actinobacteria (1) Actinopteri (17) Actinopterygii (15) Aculeata (25) Adephaga (8) Aequorlitornithes (2) Aetogate (2) Agaonidae (1) Agoniatitina (1) Aleocharinae (1) Alismatanae (4) Allotriocarida (5) Alveolata (14) Amaurobioidea (1) Ammonoidea (3) Amoebozoa (9) Amorphea (14) Amphipoda (1) Anabantiformes (1) Angiospermae (35) Anguilliformes (1) Angusteradulata (2) Animalia (102) Annelida (12) Anomalogonatae (16) Anthophila (5) Antliophora (14) Anura (1) Anystides (1) Anystina (1) Apiales (1) Apiformes (1) Apo-Tracheophyta (3) Apocrita (28) Apoditrysia (1) Apoidea (11) Apoikozoa (6) Apotracheophyta (7) Arachnida (87) Araneae (18) Araneida (1) Araneomorphae (17) Archaea (3) Archaeobranchia (1) Archaeognatha (1) Archosauria (10) Archosauromorpha (9) Archostemata (2) Arthropoda (59) Artiopoda (1) Ascomycota (13) Asgard (10) Asioryctitheria (39) Asparagales (7) Assamioidea (1) Asteiidae (1) Asteraceae ...
Acanthodii (8) Acanthomorpha (17) Acanthomorphata (7) Acariformes (2) Acaromorpha (17) Acoela (2) Actinopteri (17) Actinopterygii (15) Aculeata (16) Adephaga (5) Aequorlitornithes (1) Aetogate (2) Agaonidae (1) Alismatanae (4) Allotriocarida (2) Alveolata (13) Ammonoidea (2) Amoebozoa (9) Amorphea (9) Amphipoda (1) Anabantiformes (1) Angiospermae (32) Anguilliformes (1) Angusteradulata (2) Animalia (102) Annelida (12) Anomalogonatae (16) Antliophora (14) Anystides (1) Anystina (1) Apiformes (1) Apo-Tracheophyta (1) Apocrita (26) Apoditrysia (1) Apoidea (5) Apoikozoa (2) Apotracheophyta (7) Arachnida (79) Araneae (18) Araneomorphae (17) Archaea (3) Archaeobranchia (1) Archaeognatha (1) Archosauria (10) Archosauromorpha (9) Archostemata (2) Arthropoda (52) Ascomycota (13) Asioryctitheria (39) Asparagales (6) Assamioidea (1) Asteiidae (1) Asterales (1) Asteridae (15) Astigmata (1) Australosphenida (1) Austrochiloidea (1) Autolamellibranchia (2) Aves (27) Avialae (13) Bacteria (3) Bactritida (1) ...
Members of the order Amphipoda are gonochoric and sexually dimoprhic (males larger than females). Mating behavior: Males locate potential partners with the aid of their antenna to detect the pheromones released by the females; the male then rides or carries the female until the latter is ready to molt. When the female is ready, the male pushes the sperm into the marsupium and releases the female afterwards. A few hours later, the female releases her eggs into the marsupium for fertilization. Life cycle: Eggs are brooded in the marsupium. Eggs hatch into juveniles and remain in the marsupium for a few days. Each species undergo 20 molts at most, i.e., 1-year long life cycle (Ref. 833). ...
Members of the order Amphipoda are gonochoric and sexually dimoprhic (males larger than females). Mating behavior: Males locate potential partners with the aid of their antenna to detect the pheromones released by the females; the male then rides or carries the female until the latter is ready to molt. When the female is ready, the male pushes the sperm into the marsupium and releases the female afterwards. A few hours later, the female releases her eggs into the marsupium for fertilization. Life cycle: Eggs are brooded in the marsupium. Eggs hatch into juveniles and remain in the marsupium for a few days. Each species undergo 20 molts at most, i.e., 1-year long life cycle (Ref. 833). ...
Artifical sand replenishments are globally used as innovative coastal protection measures. In these replenishments elevated pore water concentrations of trace elements are found. This study investigated possible ecotoxicological risks at two intertidal depositional sites, the Sand Engine (SE) as a recent innovative Dutch coastal management project, and a semi-artificial tidal ... read more flat (TF). Using the Sediment Quality Triad approach, we considered three major lines of evidence (LoE): geochemical characterization, toxicity characterization using bioassays with the estuarine amphipod Corophium volutator and ecological field survey. In both depositional areas C. volutator is at risk: moderate (SE) and low (TF). For TF, the bioavailability of trace elements differs between the field site and the laboratory. Contamination from arsenic and copper is present, but the low survival rate of C. volutator from the bioassay suggests presence of additional contaminations. The highly morphological ...
We compared feeding rates of the well-established, non-invasive amphipod Gammarus roeselii with those of the invasive Dikerogammarus villosus at different prey densities and different temperatures in laboratory experiments using chironomid larvae as prey. Feeding rates were very variable in both species but higher in the invader species than in the well-established non-invasive species. These results were age independent. At high temperature (18-20 °C) and high prey density (≥1000 prey m-2) one large adult D. villosus consumed 6-9 prey day-1 on average while one G. roeselii consumed 4-7 prey d-1 and one smaller D. villosus of a length of 8-10 mm consumed 2-5 prey d-1 while one G. roeselii of the same length consumed 3 prey d-1. Predation rate decreased considerably from high (18-20 °C) to low temperature (3±2 °C), from 9 to 4 prey predator-1 d-1 in D. villosus and from 7.5 to 2.5 prey predator-1 d-1 in G. roeselii. We conclude that both gammarids consumed a biomass in the range of 1/2 to ...
Freshwater impoundments at Savannah National Wildlife Refuge (NWR), South Carolina, provide an important habitat for wildlife species, but degraded sediment quality in the Savannah River downstream of the discharge from two impoundments have caused concern about potential contaminant problems within the impoundments. The quality of sediments from five impoundments (impoundments no. 1, 2, 6, 7, and 17) on the NWR was evaluated using physical and chemical characterization, contaminant concentrations (metals, organochlorine pesticides, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons), and toxicity testing. Survival of Hyalella azteca (freshwater amphipod) exposed for 28 days to solid-phase sediments was not significantly different from controls, but growth was significantly decreased at several sites. Survival in 96-hour exposures to sediment pore water was significantly decreased at most sites. Factors contributing to the toxic responses were low pH (3.7 to 4.1), ammonia (20 mg/L), and
Twenty-one species of acanthocephalans, representative of thirteen genera from ten families of seven orders and three classes, are included in this updated checklist of acanthocephalans in South Africa. Although South Africa appears to have a less diverse acanthocephalan fauna compared to some other countries such as Iran in Asia, or Brazil in South America, this is probably an artefact of fewer parasitological surveys.
Hossain, M.B. & Hughes, L.E. 2016. New species Victoriopisa bruneiensis and Apocorophium acutum (Chevreux, 1908) from Brunei (Crustacea: Peracarida: Amphipoda). Zootaxa 4117(3): 375-386. doi: 10.11646/zootaxa.4117.3.5. reference page ...
Wenzel MA, Douglas A, James MC, Redpath SM, Piertney SB (2016) The role of parasite-driven selection in shaping landscape genomic structure in red grouse (Lagopus lagopus scotica). Mol Ecol, 25, 324-341. Piertney SB, Black A, Watt L, Christie D, Poncet S, Collins MA(2016) Resolving patterns of population genetic and phylogeographic structure to inform control and eradication initiatives for brown rats Rattus norvegicus on South Georgia. Journal of Applied Ecology, 53, 332-339.. Eustace RM, Ritchie H, Kilgallen NM, Piertney SB, Jamieson AJ (2016) Morphological and ontogenetic stratification of abyssal and hadal Eurythenes gryllus sensu lato (Amphipoda: Lysianassoidea) from the Peru-Chile Trench. Deep Sea Research Part I: Oceanographic Research Papers, 109, 91-98.. Gavan MK, Oliver MK, Douglas A, Piertney SB (2015) Gene dynamics of toll-like receptor 4 through a population bottleneck in an insular population of water voles (Arvicola amphibius). Cons Gen, 16, 1181-1193.. Meyer-Lucht Y, Mulder KP, ...
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Arifin, Zainal, Rahma Puspitasari, and Nobuyuki Miyazaki. 2012. Heavy Metal Contamination in Indonesian Coastal Marine Ecosystems: A Historical Perspective. Coastal Marine Science 38 (1): 227-33. ASTM. 2006. Standard Guide for Conducting Static Acute Toxicity Tests Starting with Embryos of Four Species of Saltwater Bivalve Molluscs. In Annual Book of ASTM Standards 2006. Section Eleven : Water and Environmental Technology. Volume 11.06 Biological Effects and Environmental Fate; Biotechnology, 58-78. Bat, Levent, and Dave Raffaelli. 1998. Sediment Toxicity Testing: A Bioassay Approach Using the Amphipod Corophium Volutator and the Polychaete Arenicola Marina. Journal of Experimental Marine Biology and Ecology 226 (2): 217-39. doi:10.1016/S0022-0981(97)00249-9. Boonyatumanond, Ruchaya, Areerat Jaksakul, Pornthip Puncharoen, and Monthip Sriratana Tabucanon. 2002. Monitoring of Organochlorine Pesticides Residues in Green Mussels (Perna Viridis) from the Coastal Area of Thailand. ...
The oxygen hypothesis, proposed by Chapelle and Peck (Chapelle and Peck, 1999), states that polar gigantism stems from high oxygen availability coupled with low metabolic rates. The authors surveyed maximum body sizes in collections of amphipod crustaceans from different habitats, finding that the size of giants in each locality - defined as the largest 5% of species in each habitat - correlated strongly with potential oxygen availability determined from water temperature (Fig. 5). They concluded that maximum potential size is limited by oxygen availability. The oxygen hypothesis has received considerable attention (see McClain and Rex, 2001; Chapelle and Peck, 2004; Woods and Moran, 2008; Woods et al., 2009; McClain and Boyer, 2009; Klok et al., 2009; Verberk and Bilton, 2011; Verberk et al., 2011) and also considerable support in some taxa, particularly amphipods (e.g. Chapelle and Peck, 2004). Moreover, there is a substantial subset of literature suggesting that atmospheric O2 and ...
TY - JOUR. T1 - Finfish and aquatic invertebrate pathology resources for now and the future. AU - Spitsbergen, Jan M.. AU - Blazer, Vicki S.. AU - Bowser, Paul R.. AU - Cheng, Keith C.. AU - Cooper, Keith R.. AU - Cooper, Timothy K.. AU - Frasca, Salvatore. AU - Groman, David B.. AU - Harper, Claudia M.. AU - Law, Jerry M.(Mac). AU - Marty, Gary D.. AU - Smolowitz, Roxanna M.. AU - St. Leger, Judy. AU - Wolf, Douglas C.. AU - Wolf, Jeffrey C.. PY - 2009/3. Y1 - 2009/3. N2 - Utilization of finfish and aquatic invertebrates in biomedical research and as environmental sentinels has grown dramatically in recent decades. Likewise the aquaculture of finfish and invertebrates has expanded rapidly worldwide as populations of some aquatic food species and threatened or endangered aquatic species have plummeted due to overharvesting or habitat degradation. This increasing intensive culture and use of aquatic species has heightened the importance of maintaining a sophisticated understanding of pathology of ...
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F1736-09(2016) Standard Guide for Irradiation of Finfish and Aquatic Invertebrates Used as Food to Control Pathogens and Spoilage Microorganisms irradiation facilities~ pathogens~ aquatic invertebrates~ finfish~
Article Bioaccumulation of petroleum hydrocarbons in arctic amphipods in the oil development area of the Alaskan Beaufort Sea. An objective of a multiyear ...
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Ritchie , H , Jamieson , A J & Piertney , S B 2016 , Isolation and Characterization of Microsatellite DNA Markers in the Deep-Sea Amphipod Paralicella tenuipes by Illumina MiSeq Sequencing , Journal of Heredity , vol. 107 , no. 4 , pp. 367-371 . https://doi.org/10.1093/jhered/ ...
A comparative approach was taken in this study to evaluate androgen (androstenedione and testosterone) metabolism in three invertebrate species: the gastropod Marisa cornuarietis, the amphipod Hyalella azteca, and the echinoderm Paracentrotus lividus. The existence of 17β/3β-hydroxysteroid dehydrogenase (HSD) and 5α-reductase catalyzed reactions was demonstrated in all three species. Androstenedione was primarily converted to 5α-androstanedione in M. cornuarietis, while it was primarily metabolized to testosterone in P. lividus and H. azteca. In addition, and consistent with vertebrate findings, tissue specific pathways and sexual dimorphism in androgen metabolism were observed. Namely, testosterone was metabolized to dihydrotestosterone in P. lividus gonads (via 5α-reductase), and metabolized to 4-androstene-3β,17β-diol in the digestive tube (via 3β-hydroxysteroid dehydrogenase). Furthermore, the synthesis of 17β-reduced metabolites of androstenedione (testosterone and ...
Survival in hypoxia, oxygen-limitation of respiration and effects of hypoxia on precopulatory mate-guarding behavior of the amphipod, Gammarus pseudolimnaeus, were tested to determine if seasonal hypoxia in Lake Taneycomo could be a limiting factor for amphipods in the lake. Currently, the Army Corps of Engineers uses oxygenation procedures at Table Rock Dam to defend 4.0 ppm dissolved oxygen (D.O.) in water entering Lake Taneycomo. However, little information exists to indicate whether this level of oxygenation is sufficient for survival, growth, and reproduction of G. pseudolimnaeus. Male, female, and juvenile amphipods survived 48 hours exposure to dissolved oxygen below the minimum daily average that is currently defended in the lake. Survival of hypoxia below 3.5 ppm was differed among genders and age with females being most sensitive, and juveniles being least sensitive. Sensitivity to hypoxia increased with an increase in temperature. Respiration of adult G. pseudolimnaeus was found to be oxygen
Ph.D. Auckland University. Research Focus: Invertebrate Ecology, Invasive Species Ecology. Office: DK 3024 and PSC 3113. Phone: 703-993-5956. E-mail: Click Here. Dr. Fowlers general research interests and experiences include global aquatic invertebrate species patterns, biodiversity, phenotypic plasticity, parasitology, and community and population level interactions of aquatic invertebrates, especially those concerning invasions. She has experience working in freshwater, estuarine, and marine systems both in the United States and globally. Currently, her laboratory at GMU has three main topics of study: host-parasite interactions, invasion dynamics and processes, and natural resource management of commercially and recreationally important aquatic invertebrate species.. Dr. Fowler teaches courses in Aquatic Invertebrate Ecology and Marine Ecology at the graduate and undergraduate level. She holds an adjunct position at the College of Charleston and is a research associate with the Smithsonian ...
Book now at Sol Azteca Restaurant in Boston, explore menu, see photos and read 440 reviews: Sol Azteca exceeded every expectation. Delicious food, attentive service and quite possibly the best margaritas in Boston.
http://www3.sympatico.ca/azcc/IAzHA.html. About the Breed. The Azteca is the National Horse of Mexico and is the first breed to be developed in Mexico. Until recently the majority of horses in Mexico were descendants of Spanish horses, such as the Galice?o, or imports from Spain or Portugal. The Spanish horse has always been favored in Mexico and the Andalusian was the foundation of the new breed.. Breeding the Azteca began in 1972 by crossing the Andalusian and American Quarter Horse, and some crosses were made between Andalusian stallions and Criollo mares. Early on, some of the leading breeders realized that systematic, scientific breeding was necessary and that the whole process would require a demanding inspection system. Allowing individual breeders to operate completely on their own produced such a variety of types of offspring that there were an insufficient number of common denominators on which to base a new horse breed.. Several considerations were foremost in the minds of the Mexican ...
Chemical peeling implies the application of a chemical agent to the skin, which causes controlled destruction of a part or the entire epidermis, with or without the dermis, leading to exfoliation and removal of superficial lesions, followed by regene
Summarized result for the determination of nature of chemical Aluminum, 2-(1,3-dihydro-1,3-dioxo-2H-inden-2-ylidene)-1,2-dihydro-6,7-quinolinedisulfonate complexes (94891 -32 -4) on the growth and other biological and physical activity of aquatic invertebrates, algae and cyanobacteria when chemical comes in contact with test organisms, by considering the data for structurally and functionally similar read across chemicals from various sources which are as follows: Short term toxicity to aquatic invertebrates: Short term toxicity of Aluminum, 2-(1,3-dihydro-1,3-dioxo-2H-inden-2-ylidene)-1,2-dihydro-6,7-quinolinedisulfonate complexes (94891 -32 -4) on the growth and other biological activity of aquatic invertebrates is predicted on the basis of it structurally and functionally similar read across chemicals. The studies are as mentioned below: Short term toxicity study was performed to determine the toxic effect of the structurally and functionally similar read across chemicals on the invertebrates ...
Hippocampus minotaur has been trawled from depths of 64 to 110 m on fine sandy or hard bottoms, possibly in association with gorgonian corals (Gomon 1997). Noticeable bud-like processes are present on the dorsal surface of the tail of H. minotaur, reminiscent of those on the body of H. bargibanti that are used for camouflage in soft coral fans. This may suggest that they inhabit gorgonians, but collection information to date has given scant habitat information (Gomon 1997). Little is known about their diet, but other seahorses typically prey on small crustaceans such as mysids, caridean shrimp, copepods, amphipods, and gammarids (Woods 2002, Kitsos et al. 2008). Their reproductive biology is also unknown, but other seahorses are ovoviviparous, and males brood embryos in a pouch prior to giving live birth (Foster and Vincent 2004 ...
Boeck A. 1872. De Skandinaviske og Arktiske Amphipoder. Christiana: A.W. Brogger. http://dx.doi.org/10.5962/bhl.title.9921 Busk G. 1884. Report on the Polyzoa collected by H.M.S. Challenger during the years 1873-76. Part I - The Cheilostomata. Report on the Scientific Results of the Voyage of H.M.S. Challenger, Zoology 10(30): xxiv, 1-216, 36 pls. Chimonides P.J. & Cook P.L. 1981. Observations on living colonies of Selenaria (Bryozoa, Cheilostomata). Cahiers de Biologie Marine 22: 207-219. Coleman C.O. 2003. Digital inking: How to make perfect line drawings on computers. Organisms, Diversity and Evolution, Electronic Supplement 14: 1-14. http://senckenberg.de/odes/03-14.htm, accessed May 2009. Coleman C.O. 2009. Drawing setae the digital way. Zoosystematics and Evolution 852: 305-310. http://dx.doi.org/10.1002/zoos.200900008 Cook P.L. 1985. Bryozoa from Ghana: a preliminary survey. Annales du Musée Royal de lAfrique Central 238: 1-315. Cook P.L. & Chimonides P.J. 1981. Morphology and ...
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MIAMI - There are few venues in international football more intimidating than Mexicos 105,000 capacity Azteca Stadium but U.S. coach Bob...
Azteca for iPad, iPhone, Android, Mac & PC! Go back in time on a mission to help the Aztecs solve an ancient mystery in this matching game.!
Farming fungi is important for Azteca ant colony survival. Veronika Mayer and her colleagues find out how this fungiculture is set up.
This pilot study shows that some calcrete nodules from the base of palaeosols in the Chinese loess sequences can be dated by U-series isochron methods. The ages obtained suggest that the nodules did not form during interglacial climate stages; rather, they formed either during interglacial/glacial transitions or glacial climate stages. Thus, the nodules appear not to have formed contemporaneously with the soils beneath which they immediately lie but significantly post-date them. Post-pedogenic injection of carbonate into stratigraphically lower horizons is therefore identified. This finding contradicts previous assumptions regarding the timing of nodule formation. Carbon and oxygen isotope analyses of the nodules identify isotopic compositions which independently suggest that climatic conditions cooler and possibly drier than at present prevailed at the time of nodule formation.. ...
Short-term toxicity to fish The lethal concentration (LC50) value of 5-nitrosalicylic acid in fish[Alburnus alburnus] in a 96 hr study on mortality effect was found to be 228.214 mg/L.Thus,considering the CLP Criteria for aquatic classification of the substance , it is concluded that 5-nitrosalicylic acid does not exhibit short term toxicity to fish [Alburnus alburnus]. Long-term toxicity to fish According to annex IX of column I , Long-term toxicity testing on fish need not to be conducted as it is already provided as part of Annex VIII requirements.Therefore this study was considered to be waived. Short-term toxicity to aquatic invertebrates The effective concentration (EC50) value of 5-nitrosalicylic acid in aquatic invertebrate (Daphnia Magna) in a 48 hr study on the basis of immobilization effect was estimated to be 244.4349 mg/L. Thus considering the value from CLP Criteria for aquatic classification of the substance, it is concluded that 5-nitrosalicylic acid does not exhibits short term ...
Experimental data for 1,2,3-Propanetriol, homopolymer, diisooctadecanoate (CAS 63705-03-3) are available investigating the short-term toxicity to fish, aquatic invertebrates and algae. No effects on either fish or algae were observed up to the limit of water solubility (, 0.15 mg/L). Available data investigating the short-term toxicity of the substance to aquatic invertebrates resulted in a 48h-EC50 value , 1 and , 10 mg/L (EL50 = 5.05 mg/L based on a statistical analysis performed by qualified scientists of the owner company). The observed EC50 value is much higher than the solubility of the UVCB substance in water (, 0.15 mg/L). Therefore, in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5 read across to the structurally similar analogue substances isooctadecanoic acid, mono- and diester with glycerol (CAS No. 97358-80-0) and Glycerides, C16-18 and C18-unsatd. (CAS 67701-30-8) was conducted in order to verify if metabolites of the ester components may have been caused the toxicity. ...
In this process, Macalady and her team discovered a previously unknown form of biofilm growing in the oxygen-deficient portion of the lake. The cave explorers had seen these strange biofilms, says Macalady. So we asked them if they could get us a sample. The Frasassi cave system is located north of Rome and south of Venice in the Marche region. These limestone caves are like New Mexicos Carlsbad Caverns and Lechuguilla Cave, but in those caves, sulfur entered the caves from oil and gas reserves, while in Italy, the sulfur source is a thick gypsum layer below. Having sulfur in the environment allows sulfur-using organisms to grow. The researchers received about the weight of two paper clips of the strange rope to analyze. They reported the results of their DNA sequencing today (December 19) at the American Geophysical Union Conference in San Francisco. We did not retrieve any sequences for known methane-producing organisms or known methane oxidizers, says Macalady. The researchers did find ...
The Derived No Effect Levels for both inhalation and dermal long-term exposure, systemic effects, are estimated on the basis of the No Observed Effect Level obtained in the subacute combined repeated with the reproduction/developmental toxicity screening test in Rats (Pasics Szakonyiné, 2018). The NOAEL was established as equal/higher than 350 mg/kg body weight/day for systemic toxicity, as well as for reproductive and developmental toxicity. The calculation of DNELs is based on the NOAEL identified, which should be corrected for the differences between effect assessment data and the real human exposure situation, taking into account variability and uncertainty within and between species. In order to correct the interspecies difference between rat and human the No Observed Adverse Effect Level has to be corrected, using the default values for DNEL calculation. No DNEL is derived for inhalation acute exposure, systemic effects, based on the physical state of the substance, inhalation is not an ...
Recorded from coastal waters at sea. Lacustrine, at depths greater than 30 m, in Lake Ladoga commonly at 50-150 m (Ref. 59043). Specimens measuring 36-40 cm are more than 5 years old. Spawns for the first time at 4-6 years (Ref. 59043). Spawns from the end of November to 20 December (Ref. 593). Oviparous (Ref. 205). Eggs are buried in unguarded nests (Ref. 205). Feeds on benthic invertebrates, especially gammarids, molluscs and insect larvae (Ref. 59043). ...
The head of the Dolphin Research Institute points the finger at another group of crustaceans called amphipods; another marine expert speculates it was jellyfish larvae.
The macrozoobenthos (5-30m depth) of Kongsfjord (Svalbard) was quantita-tively investigated by a SCUBA-diver operated airlift system. 63 taxa were found, 30 of which were not reported for Kongsfjord and seven not for Sval-bard before. Suspensivorous or surface and sub-surface detritivorous poly-chaetes and deposit-feeding amphipods were dominant. Only 12 of 45 spe-cies and additional 18 families inhabited the complete depth range (the poly-chaetes Dipolydora quadrilobata, Chaetozone setosa, Euchone analis, Lum-brineris sp., Ophelina sp., Scoloplos armiger, Spio armata, Travisia forbesii, the bivalves Axinopsida orbiculata and Crenella decussata, and the Opisto-branchia Cylichna sp. Clustering the samples showed a significant difference (ANOSIM) between the shallow station (5m) and the rest, the latter formed two subgroups the medium depth stations (10m, 15m, 20m) and the deeper sta-tions (25m, 30m). The biomass ranged from 3.5 to 25.0 g ash free dry mass m-2 and Shannon diversity was 2.06 (SD ...
Adults live in subtidal areas and are rarely found in intertidal areas. They feed on organisms which inhabit encrusting rock growths, with amphipods and hermit crabs being the dominant food items (Ref. 26966). Eggs are hemispherical and covered with numerous sticky threads that anchor them in the algae on the nesting sites (Ref. 240). Larvae are planktonic which occur primarily in shallow, nearshore waters (Ref. 94114). ...
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Our addiction to debt is no mistake. It is the way our (soon-to-be-ex) elite masters have stripped us of our wealth and enslave us. The elites now own pretty much everything. Some average people are lucky enough to own their home and a few other things outright but it doesnt amount to much. The only way the average pleb can get title to a house is to go into debt ... to the banking elites. In other words, the plebs are literally owned by the Rothschilds. Which is the what all sociopathic dictatorships have strived for through history -- complete ownership and power over everything else. The difference is that today we have complex debt instruments and manipulation which make it all seem less oppressive, and many people have been brainwashed into thinking debt is a good thing because they think it enables people to buy houses they otherwise couldnt afford, and it stimulates economic activity (or so they believe). But thats only because debt is currently the only way plebs have access to ...
Metric: Its a warm and flavorful soup. Avocado, cheeses, tortilla chips, cilantro, and tomatoes simmering together develops tons of yumminess. A cozy soup that warms you up and satisfies your taste buds.