Animal Migration: Periodic movements of animals in response to seasonal changes or reproductive instinct. Hormonal changes are the trigger in at least some animals. Most migrations are made for reasons of climatic change, feeding, or breeding.Copepoda: A huge subclass of mostly marine CRUSTACEA, containing over 14,000 species. The 10 orders comprise both planktonic and benthic organisms, and include both free-living and parasitic forms. Planktonic copepods form the principle link between PHYTOPLANKTON and the higher trophic levels of the marine food chains.Zooplankton: Minute free-floating animal organisms which live in practically all natural waters.Indian Ocean: A body of water covering approximately one-fifth of the total ocean area of the earth, extending amidst Africa in the west, Australia in the east, Asia in the north, and Antarctica in the south. Including the Red Sea and the Persian Gulf, it constitutes the third largest ocean after the ATLANTIC OCEAN and the PACIFIC OCEAN. (New Encyclopaedia Britannica Micropaedia, 15th ed, 1990, p289)Crenarchaeota: A kingdom in the domain ARCHAEA comprised of thermoacidophilic, sulfur-dependent organisms. The two orders are SULFOLOBALES and THERMOPROTEALES.Pacific OceanPredatory Behavior: Instinctual behavior pattern in which food is obtained by killing and consuming other species.Charadriiformes: An order of BIRDS including over 300 species that primarily inhabit coastal waters, beaches, and marshes. They are comprised of shorebirds, gulls, and terns.Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.Birds: Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.Rivers: Large natural streams of FRESH WATER formed by converging tributaries and which empty into a body of water (lake or ocean).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)EssaysPopulation Dynamics: The pattern of any process, or the interrelationship of phenomena, which affects growth or change within a population.Conservation of Natural Resources: The protection, preservation, restoration, and rational use of all resources in the total environment.Population Density: Number of individuals in a population relative to space.Endangered Species: An animal or plant species in danger of extinction. Causes can include human activity, changing climate, or change in predator/prey ratios.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)Accidents, Traffic: Accidents on streets, roads, and highways involving drivers, passengers, pedestrians, or vehicles. Traffic accidents refer to AUTOMOBILES (passenger cars, buses, and trucks), BICYCLING, and MOTORCYCLES but not OFF-ROAD MOTOR VEHICLES; RAILROADS nor snowmobiles.Veterinarians: Individuals with a degree in veterinary medicine that provides them with training and qualifications to treat diseases and injuries of animals.Veterinary Medicine: The medical science concerned with the prevention, diagnosis, and treatment of diseases in animals.Jejunum: The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Journal Impact Factor: A quantitative measure of the frequency on average with which articles in a journal have been cited in a given period of time.Publishing: "The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.Bibliometrics: The use of statistical methods in the analysis of a body of literature to reveal the historical development of subject fields and patterns of authorship, publication, and use. Formerly called statistical bibliography. (from The ALA Glossary of Library and Information Science, 1983)WyomingPlanets: Celestial bodies orbiting around the sun or other stars.ExhibitionsHot Springs: Habitat of hot water naturally heated by underlying geologic processes. Surface hot springs have been used for BALNEOLOGY. Underwater hot springs are called HYDROTHERMAL VENTS.Exhibits as Topic: Discussions, descriptions or catalogs of public displays or items representative of a given subject.MuseumsSkin Diseases, Genetic: Diseases of the skin with a genetic component, usually the result of various inborn errors of metabolism.History, 20th Century: Time period from 1901 through 2000 of the common era.Awards and PrizesHistory, 19th Century: Time period from 1801 through 1900 of the common era.History, 21st Century: Time period from 2001 through 2100 of the common era.Tissue Engineering: Generating tissue in vitro for clinical applications, such as replacing wounded tissues or impaired organs. The use of TISSUE SCAFFOLDING enables the generation of complex multi-layered tissues and tissue structures.Nobel PrizeButterflies: Slender-bodies diurnal insects having large, broad wings often strikingly colored and patterned.Larva: Wormlike or grublike stage, following the egg in the life cycle of insects, worms, and other metamorphosing animals.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Cardenolides: C(23)-steroids with methyl groups at C-10 and C-13 and a five-membered lactone at C-17. They are aglycone constituents of CARDIAC GLYCOSIDES and must have at least one double bond in the molecule. The class includes cardadienolides and cardatrienolides. Members include DIGITOXIN and DIGOXIN and their derivatives and the STROPHANTHINS.Asclepias: A plant genus of the family ASCLEPIADACEAE. This is the true milkweed; APOCYNUM & EUPHORBIA hirta are rarely called milkweed. Asclepias asthmatica has been changed to TYLOPHORA.Lepidoptera: A large order of insects comprising the butterflies and moths.Physiology, Comparative: The biological science concerned with similarities or differences in the life-supporting functions and processes of different species.Foot-and-Mouth DiseaseEcology: The branch of science concerned with the interrelationship of organisms and their ENVIRONMENT, especially as manifested by natural cycles and rhythms, community development and structure, interactions between different kinds of organisms, geographic distributions, and population alterations. (Webster's, 3d ed)Disease Outbreaks: Sudden increase in the incidence of a disease. The concept includes EPIDEMICS and PANDEMICS.Echinacea: A genus of perennial herbs used topically and internally. It contains echinacoside, GLYCOSIDES; INULIN; isobutyl amides, resin, and SESQUITERPENES.Societies, Scientific: Societies whose membership is limited to scientists.

How the clear-sky angle of polarization pattern continues underneath clouds: full-sky measurements and implications for animal orientation. (1/1226)

One of the biologically most important parameters of the cloudy sky is the proportion P of the celestial polarization pattern available for use in animal navigation. We evaluated this parameter by measuring the polarization patterns of clear and cloudy skies using 180 degrees (full-sky) imaging polarimetry in the red (650 nm), green (550 nm) and blue (450 nm) ranges of the spectrum under clear and partly cloudy conditions. The resulting data were compared with the corresponding celestial polarization patterns calculated using the single-scattering Rayleigh model. We show convincingly that the pattern of the angle of polarization (e-vectors) in a clear sky continues underneath clouds if regions of the clouds and parts of the airspace between the clouds and the earth surface (being shady at the position of the observer) are directly lit by the sun. The scattering and polarization of direct sunlight on the cloud particles and in the air columns underneath the clouds result in the same e-vector pattern as that present in clear sky. This phenomenon can be exploited for animal navigation if the degree of polarization is higher than the perceptual threshold of the visual system, because the angle rather than the degree of polarization is the most important optical cue used in the polarization compass. Hence, the clouds reduce the extent of sky polarization pattern that is useful for animal orientation much less than has hitherto been assumed. We further demonstrate quantitatively that the shorter the wavelength, the greater the proportion of celestial polarization that can be used by animals under cloudy-sky conditions. As has already been suggested by others, this phenomenon may solve the ultraviolet paradox of polarization vision in insects such as hymenopterans and dipterans. The present study extends previous findings by using the technique of 180 degrees imaging polarimetry to measure and analyse celestial polarization patterns.  (+info)

Speeds and wingbeat frequencies of migrating birds compared with calculated benchmarks. (2/1226)

Sixteen species of birds passing Falsterbo in southwest Sweden during the autumn migration season were observed using short-range optical methods. Air speeds and wingbeat frequencies were measured, reduced to sea level, and compared with benchmark values computed by Flight.bas, a published flight performance program based on flight mechanics. The benchmark for air speed was the calculated sea-level value of the minimum power speed (V(mp)). The mean speeds of three raptor species that flew by flap-gliding were below V(mp), apparently because the flap-glide cycle involved slowing down below V(mp) when gliding and accelerating back up to V(mp) when flapping. The mean speeds of 11 species that flew by continuous flapping were between 0.82V(mp) and 1.27V(mp). Two passerine species that flew by bounding had mean speeds of 1.70V(mp) and 1.96V(mp), but these high mean speeds reflected their ability to fly faster against head winds. These results do not support predictions from optimal migration theory, which suggest that migrating birds 'should' fly faster, relative to V(mp). However, observations were restricted for technical reasons to birds flying below 200 m and may not represent birds that were seriously committed to long-distance migration. The benchmark wingbeat frequency (f(ref)) was derived from dimensional reasoning, not from statistical analysis of observations. Observed wingbeat frequencies ranged from 0.81f(ref) to 1.05f(ref), except in the two bounding species, whose wingbeat frequencies appeared anomalously high. However, the mechanics of bounding with a power fraction q imply that gravity during the flapping phase is increased by a factor 1/q, and when the value of gravity was so adjusted in the expression for f(ref), the wingbeat frequencies of the two bounding species were predicted correctly as a function of the power fraction. In small birds with more muscle power than is required to fly at speeds near V(mp), bounding is an effective method of adjusting the specific work in the muscle fibres, allowing conversion efficiency to be maximised over a wide range of speeds.  (+info)

Light-dependent magnetoreception in birds: the behaviour of European robins, Erithacus rubecula, under monochromatic light of various wavelengths and intensities. (3/1226)

To investigate how magnetoreception is affected by the wavelength and intensity of light, we tested European robins, Erithacus rubecula, under monochromatic lights of various wavelengths at two intensities using oriented behaviour as an indicator of whether the birds could derive directional information from the geomagnetic field. At a quantal flux of 7 x 10(15) quanta s(-1) m(-2), the birds were well oriented in their migratory direction east of North under 424 nm blue, 510 nm turquoise and 565 nm green light, whereas they were disoriented under 590 nm yellow light. Increasing the intensity of light at the same wavelengths more than sixfold to 43 x 10(15) quanta s(-1) m(-2) resulted in a change in behaviour: under bright blue and green light, the birds now showed a preference for the East-West axis, with the majority of headings at the western end; under bright turquoise light, they oriented unimodally towards a direction slightly west of North. Under bright yellow light, the birds continued to be disoriented. These findings suggest a rather complex relationship between the receptors involved in magnetoreception. Magnetoreception appears to follow rules that are different from those of vision, suggesting that light-dependent magnetoreception may involve receptors and neuronal pathways of its own.  (+info)

Effects of duration and time of food availability on photoperiodic responses in the migratory male blackheaded bunting (Emberiza melanocephala). (4/1226)

The effects of the duration and time of food availability on stimulation of the photoperiodic responses (fattening and gain in body mass, and growth and development of testes) were investigated in the migratory blackheaded bunting (Emberiza melanocephala). Two experiments were performed. Experiment I examined the effects of a reduction in the duration of food supply in buntings that were subjected to long day lengths (16h:8h L:D) and received food ad libitum (group I) or for restricted durations, coinciding with the end of the lights-on period, of 8h (group II) and 4h (group III). Buntings of group I gained in body mass, whereas there was a mixed response in group II (half the birds gained and half lost body mass), and all birds of group III lost body mass. There was no effect on testis growth in groups I and II, but testes grew more slowly in group III. Experiment 2 investigated the effects of both the duration and the time of food availability. Of five groups of birds, group I was exposed to an 8h:16h L:D photoperiod, and groups II-V were exposed to 16h:8h L:D. Whereas birds of groups I and II received food ad libitum, those of groups III-V were fed only for 5 h, at zt 0-5 (group III), zt 5.5-10.5 (group IV) or zt 11-16 (group V), where zt = zeitgeber time and zt 0 refers to the beginning of the lights-on period. Apart from duration, the timing of food availability also had an effect on photoperiodic stimulation under the 16h:8h L:D photoperiod. Birds that were fed ad libitum fattened and gained in body mass, whereas among restricted feeding groups, only birds in the group fed during the first 5 h (zt 0-5, group III) showed a significant increase in body mass (albeit considerably lower than in the ad libitum group). Birds fed during the middle 5h (zt 5.5-10.5, group IV) showed an intermediate response, and those fed during the last 5h (zt 11-16, group V) lost body mass. Testicular growth was suppressed in birds that were fed for 5 h in the evening, but not in those fed for the same period in the morning or in the middle of the long day. Taken together, these results show that the duration of food supply and/or the time of day at which food is available affect photoperiodic stimulation of fattening and gain in body mass as well as the growth and development of gonads in the blackheaded bunting.  (+info)

Complex bird clocks. (5/1226)

The circadian pacemaking system of birds comprises three major components: (i) the pineal gland, which rhythmically synthesizes and secretes melatonin; (ii) a hypothalamic region, possibly equivalent to the mammalian suprachiasmatic nuclei; and (iii) the retinae of the eyes. These components jointly interact, stabilize and amplify each other to produce a highly self-sustained circadian output. Their relative contribution to overt rhythmicity appears to differ between species and the system may change its properties even within an individual depending, for example, on its state in the annual cycle or its photic environment. Changes in pacemaker properties are partly mediated by changes in certain features of the pineal melatonin rhythm. It is proposed that this variability is functionally important, for instance, for enabling high-Arctic birds to retain synchronized circadian rhythms during the low-amplitude zeitgeber conditions in midsummer or for allowing birds to adjust quickly their circadian system to changing environmental conditions during migratory seasons. The pineal melatonin rhythm, apart from being involved in generating the avian pacemaking oscillation, is also capable of retaining day length information after isolation from the animal. Hence, it appears to participate in photoperiodic after-effects. Our results suggest that complex circadian clocks have evolved to help birds cope with complex environments.  (+info)

Juvenile hormone regulation of longevity in the migratory monarch butterfly. (6/1226)

Monarch butterflies (Danaus plexippus) of eastern North America are well known for their long-range migration to overwintering roosts in south-central Mexico. An essential feature of this migration involves the exceptional longevity of the migrant adults; individuals persist from August/September to March while their summer counterparts are likely to live less than two months as adults. Migrant adults persist during a state of reproductive diapause in which both male and female reproductive development is arrested as a consequence of suppressed synthesis of juvenile hormone. Here, we describe survival in monarch butterflies as a function of the migrant syndrome. We show that migrant adults are longer lived than summer adults when each are maintained under standard laboratory conditions, that the longevity of migrant adults is curtailed by treatment with juvenile hormone and that the longevity of summer adults is increased by 100% when juvenile hormone synthesis is prevented by surgical removal of its source, the corpora allatum. Thus, monarch butterfly persistence through a long winter season is ensured in part by reduced ageing that is under endocrine regulation, as well as by the unique environmental properties of their winter roost sites. Phenotypic plasticity for ageing is an integral component of the monarch butterflies' migration-diapause syndrome.  (+info)

Deriving dispersal distances from genetic data. (7/1226)

Dispersal is one of the most important factors determining the genetic structure of a population, but good data on dispersal distances are rare because it is difficult to observe a large sample of dispersal events. However, genetic data contain unbiased information about the average dispersal distances in species with a strong sex bias in their dispersal rates. By plotting the genetic similarity between members of the philopatric sex against some measure of the distance between them, the resulting regression line can be used for estimating how far dispersing individuals of the opposite sex have moved before settling. Dispersers showing low genetic similarity to members of the opposite sex will on average have originated from further away. Applying this method to a microsatellite dataset from lions (Panthera leo) shows that their average dispersal distance is 1.3 home ranges with a 95% confidence interval of 0.4-3.0 home ranges. These results are consistent with direct observations of dispersal from our study population and others. In this case, direct observations of dispersal distance were not detectably biased by a failure to detect long-range dispersal, which is thought to be a common problem in the estimation of dispersal distance.  (+info)

Unexpected coherence and conservation. (8/1226)

The effects of migration in a network of patch populations, or metapopulation, are extremely important for predicting the possibility of extinctions both at a local and a global scale. Migration between patches synchronizes local populations and bestows upon them identical dynamics (coherent or synchronous oscillations), a feature that is understood to enhance the risk of global extinctions. This is one of the central theoretical arguments in the literature associated with conservation ecology. Here, rather than restricting ourselves to the study of coherent oscillations, we examine other types of synchronization phenomena that we consider to be equally important. Intermittent and out-of-phase synchronization are but two examples that force us to reinterpret some classical results of the metapopulation theory. In addition, we discuss how asynchronous processes (for example, random timing of dispersal) can paradoxically generate metapopulation synchronization, another non-intuitive result that cannot easily be explained by the standard theory.  (+info)

  • Critically, the role of migrants may be complicated by the infection process itself, as animals must become infected prior to departure and be able to migrate successfully whilst infected in order to transport a parasite from one location to another. (
  • Adding to limited empirical data on the effects of infection on animal migrations, we show that Bewick's swans naturally infected with avian influenza virus delayed departure and traveled shorter distances during spring migration compared to uninfected individuals. (
  • and during spring migration, passerines passing through a stop-over site later showed higher intensities of haemosporidian parasite infection. (
  • 2017. Animal-assisted therapy in the treatment of substance use disorders: A systematic mixed methods review. (
  • When there are great numbers of squirrels, arctic foxes, or lemmings, mass migrations, or irruptions, occur, in which thousands of individuals move en masse in the same direction, overcoming considerable water obstacles along the way. (
  • These are just 6 of the many astonishing marine spectacles that can be witnessed in person all over North America and in the pages of Vladimir Dinet's Wildlife Spectacles: Mass Migrations, Mating Rituals, and Other Fascinating Animal Behaviors. (
  • Adding to limited empirical data on the effects of infection on animal migrations, we show that Bewick's swans naturally infected with avian influenza virus delayed departure and traveled shorter distances during spring migration compared to uninfected individuals. (
  • With respect to international migration, the recommendation of the United Nations (and the practice of a number of countries) is to define removal for one year or more as "permanent," and thus as migration, while a stay for a shorter period is classified as a visit. (
  • However, the details of how sea turtles, and other groups such as seals and whales, navigate during long migrations remains an open question. (
  • Animation timing has been adjusted so that turtles from all years depart nesting beaches at the same time and migration duration in days is indicated by the counter in the lower right hand corner of the video frame. (
  • The study also showed that turtles frequently struggled to find small islands, overshooting, and/or searching for the island in the final stages of migration. (
  • Among reptiles the most extensive migrations are made by sea turtles. (
  • Around 150 research projects around the globe plan to track the migrations of a wide range of animals, including sea turtles, jaguars, bats and migratory birds. (
  • Scientists taking part in the Icarus-initiative are working together to develop a satellite-based system to observe small animals such as birds, bats and turtles. (
  • It was a busy holiday weekend for our Animal Rescue and Animal Health teams as they triaged 30 sea turtles that stranded on the coast of New England. (
  • Since salmon and sea turtles are so far apart on the evolutionary tree, the new findings suggest that other migratory marine animals likely have this ability as well. (
  • 125 g), banding recoveries and at-sea surveys suggest that its annual migration from boreal and high Arctic breeding grounds to the Southern Ocean may be the longest seasonal movement of any animal. (
  • The Arctic tern holds the long-distance migration record for birds. (
  • Barriers and distances as determinants for the evolution of bird migration links: the arctic shorebird system. (
  • The analysis indicated that the evolution of migratory links among arctic shorebirds is constrained not by distance as such but by distance across ecological barriers, possibly because of the complex adaptations required for barrier crossing and extensive detour migration (and in a few cases because barrier distances exceed the birds' theoretical flight range capacity). (
  • In fact, interspecies sex brought on by the melting Arctic ice could lead to the extinction of many endangered Arctic animals, the scientists said in an article published in the journal Nature. (
  • Jeffrey Buler is a researcher at the University of Delaware who also uses radar to study bird migrations. (
  • For example, timing of migration can be strongly linked to timing of reproduction, and relatively small effects early in the season can thus ultimately affect the fitness of a bird. (
  • Allen WH (1948) Bird migration and magnetic meridians. (
  • Bird migration is the regular seasonal movement, usually north and south along a 'flyway', between breeding and wintering grounds. (
  • When they aren't chomping on wires, they like to eat endangered animals, such as the black-capped vireo-a bird found in states like Texas. (
  • In collaboration with the exhibition into the forest, please join Common Street Arts for a free presentation by Bernd Heinrich who will discuss the fall bird migration and its contrast with other animals in terms of why and how they travel great distances. (
  • Bianchi, D. & Mislan, K. A. S. Global patterns of diel vertical migration times and velocities from acoustics data. (
  • Wildebeests and zebras alike went farther out of their way to dodge people than to avoid even animal predators like hyenas or lions-decisions that appear to be profoundly affecting their migration patterns. (
  • If these animals are tracking rainfall patterns, which we know they are, then climate change could mean a fairly substantial change to their migration pattern,' said Grant Hopcraft, a research fellow with the University of Glasgow's Boyd Orr Centre for Population and Ecosystem Health, who led the project. (
  • Animals like lush vegetation, which means they tend to follow the rain patterns: in this case east for summer rain (C4 grasses), and west for winter rain (C3 grasses). (
  • Hodgkins says this is just a first attempt at using isotopic data to test the hypothesis of east and west migration patterns at these sites and further research will be done. (
  • It is quite possible that animal migration patterns changed as the coastline moved in and out during glacial and interglacial cycles," said Hodgkins. (
  • Over hundreds of years they have established migratory patterns (to the point that some of the major roadways that humans use to navigate the desert have been created by the animals that walk them year after year). (
  • This is also true for birds, who have wide-ranging and well established migration patterns that we are very well aware of. (
  • A physiological study of certain migrants has revealed that metabolic patterns usually change prior to migration, and fats accumulate in the body tissues. (
  • Some, such as the woodcock, snipe, lapwing, starling, and lark, rely on surrounding conditions to initiate their spring and autumn migrations, and the patterns of their flight depend on temperature and barometric pressure . (
  • We describe key analytical techniques, potential bottlenecks and a roadmap for progress toward a synthesis of movement patterns of wild animals. (
  • With the help of 40 GPS and cellphone-outfitted animals over the past decade, researchers discovered that herds are willing to avoid food if it means escaping the detection of humans. (
  • The Serengeti is the site of what most consider the most dramatic migration , with giant herds of millions of animals-some 750,000 zebras and 1.2 million wildebeests as well as gazelles and eland-traveling from the Ngorongoro area in southern Tanzania to the Masai Mara in lower Kenya and returning as the rains dictate. (
  • Animal migrations have been important milestones for human society, from the arrival or departure of migratory birds signaling changes in seasons, to hunter-gatherers following the movement of herds across steppes and savannahs and fishermen following salmon runs and the progress of fish stocks between feeding and breeding grounds. (
  • Today, these issues are being overcome through the development of sophisticated telemetry technologies that allow researchers to remotely locate and track animals. (
  • Animal Migration in a Climate of Change is a special four-part series that explores the way environmental change is affecting the natural movement of animals all around the world. (
  • Whether or not an animal migrates can depend on local climate. (
  • The trigger for the migration may be local climate, local availability of food, the season of the year or for mating reasons. (
  • Bernd Heinrich is a professor emeritus in the biology department at the University of Vermont and is the author of numerous books related to his research examining the adaptations of animals and plants to their physical environments. (
  • Without any prior migration experience, juvenile Chinook salmon can find their way to ancestral feeding grounds by using the Earth's magnetic field and an inherited internal map, according to a new study. (
  • Scientists today still attach tags, such as metal bands, to track movement of animals. (
  • Scientists can track the locations and movement of the tagged animals without recapturing them using this RFID technology or satellites. (
  • Satellite tracking is especially useful because the scientists do not have to follow after the animal nor do they have to recover the tag to get the data on where the animal is going or has gone. (
  • Naidoo says the research team in Namibia-scientists from WWF and Namibia's Ministry of Environment and Tourism-had a suspicion that the zebras were up to something, 'since animals seemed to just show up on the floodplains in Salambala communal conservancy in the dry season, where there are permanent water sources, and then disappear in the wet season. (
  • Scientists suspected - and DNA-typing later confirmed - that the animal was a polar-grizzly hybrid, a creature known variously as a "pizzly" or "grolar bear. (
  • A "gravitational" sense, scientists hypothesize, may allow animals to construct an intuitive map of their longitude and latitude, and navigate accordingly. (
  • The eastern North American monarch population is notable for its annual southward late-summer/autumn migration from the northern and central United States and southern Canada to Florida and Mexico . (
  • Food consumption increases with the autumn molt, reaching a peak at the beginning of the migration season. (
  • The migratory segment between the northernmost stopover site and the breeding area, associated with the entry to and exit from the tundra during spring and autumn migration, respectively, was also identified and measured for each potential link. (
  • Running title: Monarch alternative migration: We collected 434 adult monarchs and surveyed milkweeds for immature monarchs in southwest Michigan, USA in order to test the hypothesis that monarchs are temporally variable, sequential partial migrants rather than partial migrants that may be spatially separated. (
  • Here, we test the hypothesis that partial migration results from these costs being countered by reproductive benefits of residency, with migratory decisions dependent upon mating prospects the following year (electronic supplementary material, figure S1). (
  • As reported in an article published online today in the journal Oryx , the migration, which has now been observed in consecutive years, isn't on the scale of what goes down on the Serengeti-it involves just a few thousand Burchell's zebras (Equus quagga) . (
  • Survival of the fittest is nature's way of weeding out the weak from the strong, but what happe-ns when otherwise healthy animals come in contact with weak or diseased animals? (
  • He is one of two parrots that are leading a dance dance revolution, by showing that the human behaviour of moving in time to music (even really, really bad music) is one that's shared by other animals. (
  • Receive email alerts on new books, offers and news in Animal Behaviour, Biological Anthropology and Primatology. (
  • Jamie Hodgkins, PhD, assistant professor of anthropology at University of Colorado Denver, and her team drilled ancient herbivore teeth to find that many local animals stayed put in the ecologically rich ecosystem, which may explain why humans flourished there, too. (
  • Every animal in an ecosystem plays an important role in the well-being of our planet. (
  • But the animals cover more than 300 miles (500 kilometers) in a straight-line, up-and-back journey across Namibia and Botswana. (
  • Migratory animals are thought to play a unique role in parasite dynamics and disease epidemics, both within and between resident communities. (
  • An understanding of the global migration dynamics of highly pathogenic avian influenza A(H5N1) virus is helpful for surveillance and disease prevention. (
  • The differences in migration dynamics between avian and human influenza viruses might help with the design of region-specific surveillance efforts and the selection of vaccine candidates. (
  • Understanding the migration dynamics of HPAI (H5N1) viruses is thus essential for surveillance and prevention of these infections in birds and humans and for policy decisions on vaccine development and/or implementation. (
  • Changes in migration behaviours could influence nutrient transfer in ecosystems, affect pest control and pollination, and, in particular, alter infectious disease dynamics [ 2 , 14 , 15 ]. (
  • This technology utilizes a light sensor that tracks the light-level data during regular intervals in order to determine a location based on the length of the day and the time of solar noon.While there are benefits and challenges with using this method of tracking, it is one of the only practical means of tracking small birds over long distances during migration. (
  • Specialty couriers transport animals over long distances. (
  • This daily excursion, referred to as diel vertical migration (DVM), is thought of primarily as an adaptation to avoid visual predators in the sunlit surface layer 1 , 2 and was first recorded using ship-net hauls nearly 200 years ago 3 . (
  • Many aquatic animals make a Diel vertical migration, travelling a few hundred meters up and down the water column, while some jellyfish make daily horizontal migrations, traveling a few hundred meters across a lake. (
  • The long-term conservation of these animals depends on the actions of landowners and other stakeholders far beyond the national park's borders. (
  • Come examine why animals make these incredible journeys and learn about the cutting-edge conservation science that's taking place in one of America's crowning natural treasures-Yellowstone National Park. (
  • As an environmental treaty under the aegis of the United Nations Environment Programme, CMS provides a global platform for the conservation and sustainable use of migratory animals and their habitats. (
  • CMS brings together the States through which migratory animals pass, the Range States, and lays the legal foundation for internationally coordinated conservation measures throughout a migratory range. (
  • Last month, the East African Court of Justice (EACJ) ruled against the so-called Serengeti Highway, which aims to carry up to 800 commercial vehicles a day across what is now the migratory path for millions of wildebeests, zebras, gazelles and other animals. (
  • In the Serengeti the animals meander more before circling back, so their feet touch more ground, but the distance between the zebras' two destinations is greater. (
  • Well, all migratory animals rely on a series of instinctive triggers, which can include lengthening days as spring arrives, an increase in reproductive hormones and fat deposits, and growing restlessness. (
  • A comparison between Barnacle Geese equipped with harness-attached tracking devices and individuals fitted with geolocators attached to leg bands showed that birds equipped with tracking devices were only slightly delayed in timing of migration and reproduction and otherwise were not affected in reproductive output. (
  • Both temporal and spatial components of this index are biologically important because the length of time males are absent from leks probably affects both condition-related benefits and future reproductive costs of migration. (
Category:Animal migration - Wikimedia Commons
Category:Animal migration - Wikimedia Commons (
Animals Collection | Science Trek | PBS
Animals Collection | Science Trek | PBS (
Daytime sleeping behavior observed in a Black-and-white Warbler during spring stopover : Animal Migration
Daytime sleeping behavior observed in a Black-and-white Warbler during spring stopover : Animal Migration (
Ears for Icarus | Max-Planck-Gesellschaft
Ears for Icarus | Max-Planck-Gesellschaft (
Losses can be significantly reduced by using suitable fertilisation methods. | Max-Planck...
"Losses can be significantly reduced by using suitable fertilisation methods". | Max-Planck... (
Tracking of Arctic terns Sterna paradisaea reveals longest animal migration | PNAS
Tracking of Arctic terns Sterna paradisaea reveals longest animal migration | PNAS (
1005 Best Homestead Heritage Explorers images | Farm preschool, Preschool activities, Farm theme preschool
1005 Best Homestead Heritage Explorers images | Farm preschool, Preschool activities, Farm theme preschool (
A Basic Guide To Animal Migration | HubPages
A Basic Guide To Animal Migration | HubPages (
The Evolution of Migration | HowStuffWorks
The Evolution of Migration | HowStuffWorks (
Epic Animal Migrations Could Change with Global Warming - Scientific American
Epic Animal Migrations Could Change with Global Warming - Scientific American (
The Effects of Global Warming on Animals ⋆ Green and Clean Mom Blog
The Effects of Global Warming on Animals ⋆ Green and Clean Mom Blog (
Monarch butterfly - Wikipedia
Monarch butterfly - Wikipedia (
Birds in serious decline at Lake Constance | Max-Planck-Gesellschaft
Birds in serious decline at Lake Constance | Max-Planck-Gesellschaft (
Humans limit animal movements | Max-Planck-Gesellschaft
Humans limit animal movements | Max-Planck-Gesellschaft (
Migration - Physiological stimulus of migration |
Migration - Physiological stimulus of migration | (
Are salmon endangered worldwide?
Are salmon endangered worldwide? (
Geomagnetic storm - Wikipedia
Geomagnetic storm - Wikipedia (
Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways
Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways (
Interpreting surveys to estimate the size of the monarch butterfly population: Pitfalls and prospects
Interpreting surveys to estimate the size of the monarch butterfly population: Pitfalls and prospects (
Longest Migration Among African Mammals Discovered
Longest Migration Among African Mammals Discovered (
Young Salmon Born Knowing Migration Route | Live Science
Young Salmon Born Knowing Migration Route | Live Science (
Summary and Assessment | Global Climate Change and Extreme Weather Events: Understanding the Contributions to Infectious...
Summary and Assessment | Global Climate Change and Extreme Weather Events: Understanding the Contributions to Infectious... (
Trans-Equatorial Migration Routes, Staging Sites and Wintering Areas of a High-Arctic Avian Predator: The Long-tailed Skua ...
Trans-Equatorial Migration Routes, Staging Sites and Wintering Areas of a High-Arctic Avian Predator: The Long-tailed Skua ... (
Do Healthy Monarchs Migrate Farther? Tracking Natal Origins of Parasitized vs. Uninfected Monarch Butterflies Overwintering in...
Do Healthy Monarchs Migrate Farther? Tracking Natal Origins of Parasitized vs. Uninfected Monarch Butterflies Overwintering in... (
Ecosystem Interactions Underlie the Spread of Avian Influenza A Viruses with Pandemic Potential
Ecosystem Interactions Underlie the Spread of Avian Influenza A Viruses with Pandemic Potential (
Parallel Lives
Parallel Lives (
Hamilton: Why media tell climate story poorly | The Star
Hamilton: Why media tell climate story poorly | The Star (
Persistent impacts of West Nile virus on North American bird populations | PNAS
Persistent impacts of West Nile virus on North American bird populations | PNAS (
Proceedings of International Conference on Recent Advancement on Computer and Communication  - ICRAC 2017 | Basant Tiwari |...
Proceedings of International Conference on Recent Advancement on Computer and Communication - ICRAC 2017 | Basant Tiwari |... (
StarTribune - Print Page
StarTribune - Print Page (
MPI for Ornithology (Radolfzell) | Max Planck Society
MPI for Ornithology (Radolfzell) | Max Planck Society (
250 Conservation Organizations, Professional Societies, Outdoor Groups, and State Agencies Call for a House Vote on Recovering...
250 Conservation Organizations, Professional Societies, Outdoor Groups, and State Agencies Call for a House Vote on Recovering... (
Secretagogin-dependent matrix metalloprotease-2 release from neurons regulates neuroblast migration | PNAS
Secretagogin-dependent matrix metalloprotease-2 release from neurons regulates neuroblast migration | PNAS (
10 Unusual Solutions To Animal Problems - Listverse
10 Unusual Solutions To Animal Problems - Listverse (