No data available that match "Animal Migration"

*  The Ecology of Migrant Birds: A Neotropical Perspective: John H Rappole | NHBS Book Shop
Migration is explored from the perspective of the tropical, or nonbreeding, portion of the migrant life cycle. The transient ... Animal & General Biology*General Biology. *Animals: General. *Animals: Veterinary Science. *View All (9) ... and Old World versus New World migration patterns. ... Animal & General Biology *Animals: Behaviour. *General Biology ...
*  CMS | Gorilla Agreement
CMS brings together the States through which migratory animals pass, the Range States, and lays the legal foundation for ... CMS provides a global platform for the conservation and sustainable use of migratory animals and their habitats. ... CMS Symposium on Animal Migration - TS No. 2 UNEP/CMS Secretariat Technical Series 11 1999 ... CMS brings together the States through which migratory animals pass, the Range States, and lays the legal foundation for ...
*  Animal migration - Wikipedia
Animal migration. Cambridge University Press. Baker, R.R. (1978) The Evolutionary Ecology of Animal Migration. Holmes & Meier ... Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most ... Dingle, H. (1996) Migration: The Biology of Life on the Move. Oxford University Press. Gauthreaux, S.A. (1980) Animal Migration ... Animal navigation Human migration Dingle, Hugh; Drake, V. Alistair (2007). "What is migration?". BioScience. 57 (2): 113-121. ...
*  Animal migration tracking - Wikipedia
For years scientists have been tracking animals and the ways they migrate. One of the many goals of animal migration research ... "Animal Migration Research, Jeff Kelly Lab". Retrieved 2017-03-02. Stutchbury, Bridget J. M.; Tarof, ... This approach of using radio tracking can be used to track the animal manually but is also used when animals are equipped with ... Metal bands require the re-capture of animals for the scientists to gather data; the data is thus limited to the animal's ...
*  How does human structures and roads affect animal migration? | GreenAnswers
In their assessment they determined that roads and structures fragment animal populations. This reduces the numbers of animals ... Roads, especially roads with a large amount of traffic can be very dangerous for migrating animals that could get hit by a ... development their ability to migrate will also be negatively impacted since not all animals that perform a migration survive, ... Davis performed an assessment of the impacts of roads on animal population viability. ...
*  A secret to animal migration unlocked - Technology & science - Science - LiveScience | NBC News
... isolated what are essentially tiny compass needles in the noses of rainbow trout that may explain these and many other animals ... A secret to animal migration believed unlocked at last Likely source of magnetic sense identified by researchers studying trout ... The work may also lead to more rapid advances in the understanding of animal migration simply by demonstrating a new technique ... By learning the strength of a field that exists at a particular destination, the animals can home in on it. That much is pretty ...
*  Invisible Boundaries: Exploring Yellowstone's Great Animal Migrations - National Geographic Society
The long-term conservation of these animals depends on the actions of landowners and other stakeholders far beyond the national ... However, major challenges await migratory animals as they leave Yellowstone National Park. ... The Greater Yellowstone Ecosystem lies in the path of some of the most significant wildlife migration routes on the planet. ... and original artwork to explore the compelling story behind some of the most amazing animal migrations on the planet. ...
*  CIE Spotlight: How does infection alter animal migrations? | Centre for Integrative Ecology
Migratory animals are thought to play a unique role in parasite dynamics and disease epidemics, both within and between ... How does infection alter animal migrations? Authors: Hoye, Bethany J.; Bauer, Silke S. Source: INTEGRATIVE AND COMPARATIVE ... HomeCIE Spotlight: How does infection alter animal migrations? CIE Spotlight: How does infection alter animal migrations?. May ... Adding to limited empirical data on the effects of infection on animal migrations, we show that Bewick's swans naturally ...
* : Major Public Lectures in Cambridge
Animal Migration. Professor Iain Couzin, Max Planck Institute for Ornithology. Monday 12 March. New micro-machines, new ...
* - mammals
New research reveals sound of deep-water animal migration. New research finds there is a distinct sound coming from a massive ... Mammals (formally Mammalia) are a class of vertebrate animals whose females are characterized by the possession of mammary ... Researchers find pigment from fossils, revealing color of extinct animals. Scientists from Virginia Tech and the University of ...
*  Browse - Oxford Scholarship
Animal Migration : A Synthesis. Published in print: 2011-01-13. This book takes a comparative, integrated view of migration, ... Animal Migration: A Synthesis. E.J. Milner-Gulland, John M. Fryxell, and Anthony R.E. Sinclair (eds). Published in print:. 2011 ... Movement and migration on land, in the air, and in water are pervading features of animal life-from the smallest protozoans to ... Movement and migration on land, in the air, and in water are pervading features of animal life-from the smallest protozoans to ...
*  A Trans-Hemispheric Migratory Songbird Does Not Advance Spring Schedules or Increase Migration Rate in Response to Record...
7300 km spring migration of 52 purple martins Progne subis from the Amazon basin to two breeding sites in eastern North America ... It is unclear to what extent individuals can adjust migration timing or en route rate in response to annual variation in ... Once in North America, individuals likely had limited opportunity to speed up their migration because this final portion of the ... faster migration, or earlier arrival at breeding areas compared with earlier years. Temperatures and rainfall in the Amazon ...
*  List of Stuff You Should Know episodes - Wikipedia
Animal Migration: Where's that gnu gnoing?. HowStuffWorks. Retrieved 2016-01-28. Addiction: Why you can't kick SYSK. ... "How Animal Testing Works". HowStuffWorks. Retrieved 2016-10-10. "Do Animals Have Natural Rights?". HowStuffWorks. Retrieved ... How Animal Camouflage Works. HowStuffWorks. Retrieved 2016-03-20. Is there a disease that kills by preventing sleep?. ... Do animals have a sixth sense?. HowStuffWorks. Retrieved 2016-01-12. How Propaganda Works. HowStuffWorks. Retrieved 2016-01-12 ...
*  The Prevalence of Ophryocystis elektroscirrha Infections in the Monarch Butterfly (Danaus plexippus): A Study of the Protozoan...
"Animal migrations: endangered phenomena." American Zoologist 31 (1991): 265-276.. Davis, A.K., et al. "Recommendations for ... "Spring migration of monarch butterflies in California." In Biology and Conservation of the Monarch Butterfly, S.B. Malcolm and ... "Autumnal migration routes of the eastern population of the monarch butterfly (Danaus plexippus L.;Danaidae; Lepidoptera) in ... "Associations between host migration and the prevalence of a protozoan parasite in natural populations of monarch butterflies." ...
*  MPI for Ornithology (Radolfzell) | Max Planck Society
... scientists research bird and other animal migration behaviour: how do animals get from one place to another and how do they ... Using animal behaviour data to better inform mathematical models of animal movements more ... the major animal migrations in our world present an incomparable spectacle. Yet in many cases, surprisingly little is known ... Many animal species have made their homes in towns and cities. However, the conditions they encounter there are different than ...
*  DCI in Life Science |
Weird Science: Animal Migration. *Traditional Ways of Knowing: Polynesian Stick Charts. *Weird Science: Compasses and Magnetic ... How can there be so many similarities among organisms yet so many different kinds of plants, animals, and microorganisms?. How ...
*  Arctic Institute of North America (AINA) - Publications
Animal distribution; Animal live-capture; Animal migration; Animal mortality; Animal population; Animal reproduction; Animal ... Aerial surveys; Animal behaviour; Animal distribution; Animal live-capture; Animal migration; Animal mortality; Animal ... Adaptation (Biology); Animal behaviour; Animal distribution; Animal ecology; Animal live-capture; Animal migration; Animal ... Animal behaviour; Animal ecology; Animal food; Animal health; Animal population; Animal waste products; Biomass; Caribou; Dryas ...,+n.c.+and+rt+any+p?COMMANDSEARCH&DISPLAY=Nic%20Larter
*  Arctic Institute of North America (AINA) - Publications
Animal anatomy; Animal behaviour; Animal distribution; Animal food; Animal growth; Animal live-capture; Animal migration; ... Animal distribution; Animal food; Animal health; Animal migration; Animal mortality; Animal population; Animal reproduction; ... Animal distribution; Animal food; Animal migration; Animal mortality; Animal population; Animal reproduction; Animal tagging; ... Aerial surveys; Animal anatomy; Animal distribution; Animal ecology; Animal migration; Animal mortality; Animal population; ...,+f.l.+and+rt+any+p?COMMANDSEARCH&DISPLAY=Frank%20Miller
*  Manakin migration trade-offs | Biology Letters
Migration is among the most fascinating of animal behaviours and occurs in a wide variety of taxa worldwide [1]. For migration ... Facultative, partially migratory animals provide a contemporary window into the evolution of migration, offering rare ... This work was approved by the Animal Use Subcommittee of the University of Western Ontario's Council on Animal Care (protocol ... 2008 Partial migration in birds: tests of three hypotheses in a tropical lekking frugivore. J. Anim. Ecol. 77, 1122-1128. doi: ...
Animal migration, navigation and homing. Spri nger, New York, USA. Wiltschko R. and W. Wiltschko 2003 Avian navigation: from ... resulting in increased fitness for the average animal. Dominant animals tend to exclude less dominant animals from optimal ... I also rotated l ocation time s for each animal so that the same animal was not located at the same hour too frequently. I ... 13 CHAPTER 1 INTRODUCTION On Animal Movement Wild animal movements are usually related to improving their chances of survival ...
*  Swarm behaviour - Wikipedia
Animal Migration. London: Natural History Museum. p. 107. ISBN 978-0-565-09243-6. Hoare, Ben (2009). Animal Migration. London: ... around each animal. In the zone of repulsion, very close to the animal, the focal animal will seek to distance itself from its ... In the outermost zone of attraction, which extends as far away from the focal animal as it is able to sense, the focal animal ... In North America they make massive southward migrations starting in August until the first frost. A northward migration takes ...
*  Reindeer - Wikipedia
During the spring migration smaller herds will group together to form larger herds of 50,000 to 500,000 animals, but during ... Hoare, Ben (2009). Animal Migration. London: Natural History Museum. p. 45. ISBN 978-0-565-09243-6. Arctic Reindeer Go Off the ... Infections create an effect known as culling: infected migrating animals are less likely to complete the migration. Normally ... I remember a story my Uncle Jack told me - a Dunne-Za creation story about how animals once ruled the earth and were ten times ...
*  Dienekes' Anthropology Blog: 02/2013
This is not trivial; it might seem like a small jump from Thrace (where the endpoint of the first migration, marked with 1 is ... The faunal samples show a wide range of 87Sr/86Sr values demonstrating that some animals were raised in a variety of locales. ... This may be a more prosaic explanation (Big Men projecting their power and prowess as a reflection of the dangerous animals ... Anthony, David Two IE phylogenies, three PIE migrations, and four kinds of steppe - p. 1-21. Balanovsky, Oleg; Utevska, Olga; ...

No data available that match "Animal Migration"

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

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)

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

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)

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

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)

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

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)

(5/1226) Complex bird clocks.

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)

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

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)

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

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)

(8/1226) Unexpected coherence and conservation.

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)

  • species
  • Migration can take very different forms in different species, and as such there is no simple accepted definition of migration. (
  • Many of these migrations are north-south, with species feeding and breeding in high northern latitudes in the summer, and moving some hundreds of kilometres south for the winter. (
  • Most fish species are relatively limited in their movements, remaining in a single geographical area and making short migrations for wintering, to spawn, or to feed. (
  • Among the dragonflies, species of Libellula and Sympetrum are known for mass migration, while Pantala flavescens, known as the globe skimmer or wandering glider dragonfly, makes the longest ocean crossing of any insect, between India and Africa. (
  • Researchers not only look at the animals' migration but also what is between point a and point b to determine if a species is moving to new locations based on food density, a change in water temperature, and the animal's ability to adapt to these changes. (
  • Passive integrated transponders (PIT) are another method of telemetry used to track the movements of a species Passive integrated transponders, or "PIT tags", are electronic tags that allow researchers to collect data from a specimen without the need to recapture and handle the animal. (
  • Many animal species have made their homes in towns and cities. (
  • It is a key species in the Antarctic ecosystem and is, in terms of biomass, probably the most abundant animal species on the planet (approximately 500 million tonnes, corresponding to 300 to 400 trillion individuals). (
  • Mothers fast for a relatively long period of time over the period of migration, which varies between species. (
  • In most species of animals, individuals will benefit from living in groups, because depending on the species, individuals are more vulnerable to predation and more likely to have difficulty finding resources and food. (
  • Conservation biology is tied closely to ecology in researching the population ecology (dispersal, migration, demographics, effective population size, inbreeding depression, and minimum population viability) of rare or endangered species. (
  • All species feed on both animal and plant tissue. (
  • caribou
  • 1) It would have been biologically impossible for the estimated 1985 population on Boothia Peninsula (4831 543 SE caribou one year old or older) to sustain the estimated annual harvest of 1100 one year old or older animals without continual annual ingress of caribou from beyond Boothia Peninsula. (
  • Two major subspecies in North America, the Porcupine caribou and the barren-ground caribou, form large herds and undertake lengthy seasonal migrations from birthing grounds, to summer and winter feeding grounds in the tundra and taiga. (
  • The migrations of Porcupine caribou herds are among the longest of any terrestrial mammal. (
  • birds
  • 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. (
  • Storks injured by arrows (termed as pfeilstorch in German) traceable to African tribes were found in Germany in 1822 and constituted some of the earliest evidence of long distance migration in European birds. (
  • The Mauryan emperor Ashoka around 250 B.C. issued edicts restricting the slaughter of animals and certain kinds of birds, as well as opened veterinary clinics. (
  • swarms
  • Phytoplankton also gather in huge swarms called blooms, although these organisms are algae and are not self-propelled the way animals are. (
  • It is a small, swimming crustacean that lives in large schools, called swarms, sometimes reaching densities of 10,000-30,000 individual animals per cubic metre. (
  • distances
  • Researchers have isolated what are essentially tiny compass needles in the noses of rainbow trout that may explain these and many other animals' incredible ability to navigate across vast distances. (
  • 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. (
  • movements
  • Using measurements of naturally occurring stable isotopes to track movements, and behavioural observations to estimate mating success, we examined the costs of migration in white-ruffed manakins ( Corapipo altera ) in northeast Costa Rica. (
  • hypotheses
  • After eliminating alternative hypotheses regarding the causes of altitudinal migration in this community and population [ 7 - 9 ], we showed that residents incur physiological costs of high-elevation storms that limit foraging opportunities, compromising condition [ 10 ]. (
  • mammals
  • Mammals (formally Mammalia ) are a class of vertebrate animals whose females are characterized by the possession of mammary glands while both males and females are characterized by sweat glands, hair, three middle ear bones used in hearing, and a neocortex region in the brain. (
  • Researchers
  • For about 30 years now, many researchers have suspected that at least some animals use microscopic crystals of the mineral magnetite to sense magnetism," Lohmann said. (
  • population
  • 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. (
  • biology
  • Kenneth Lohmann, a distinguished professor of biology at the University of North Carolina who studies animals' magnetic sense, said the new results have ramifications beyond the realm of rainbow trout. (
  • bird
  • However recent studies of starling flocks have shown that each bird modifies its position, relative to the six or seven animals directly surrounding it, no matter how close or how far away those animals are. (
  • make
  • 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. (
  • sense
  • In the outermost zone of attraction, which extends as far away from the focal animal as it is able to sense, the focal animal will seek to move towards a neighbour. (
  • Cognates of Old English dēor in other dead Germanic languages have the general sense of animal, such as Old High German tior, Old Norse djúr or dýr, Gothic dius, Old Saxon dier, and Old Frisian diar. (
  • planet
  • As part of the National Park Service's centennial celebration, and in conjunction with the May issue of National Geographic magazine, "Invisible Boundaries" uses stunning photographs, immersive video, interactive migration maps, cultural objects, and original artwork to explore the compelling story behind some of the most amazing animal migrations on the planet. (
  • however
  • A major problem, however, has been that the magnetite particles in animals are tiny, and finding them under a microscope has proved to be exceedingly difficult. (
  • However, Aldrovandi - and before him Konrad Gesner - thought that rangifer and tarandus were two separate animals. (
  • size
  • When they are not fed in aquaria, they shrink in size after moulting, which is exceptional for animals the size of krill. (
  • Antarctic krill directly use the minute phytoplankton cells, which no other animal of krill size can do. (
  • form
  • Telemetry, in general, involves the use of a transmitter that is attached to an animal and sends out a signal in the form of radio waves, just as a radio station does. (
  • found
  • This reduces the numbers of animals found in an area and reduces the quality of the local environment. (
  • If the authors are correct that the magnetite they have found is involved in detecting magnetic fields (which seems likely), then … this might have important implications for how other animals perceive magnetic fields," Lohmann told LiveScience. (
  • towards
  • CMS Parties strive towards strictly protecting these animals, conserving or restoring the places where they live, mitigating obstacles to migration and controlling other factors that might endanger them. (
  • once this has moulted into a metanauplius, the young animal starts migrating towards the surface in a migration known as developmental ascent. (
  • time
  • 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. (
  • rate
  • or it may increase the rate of energy consumption during migration, with resources diverted to either the parasite or to the immune system. (