Seasonal movements of caribou in arctic Alaska as determined by satellite

Fancy, Steven G.; Pank, Larry F.; Whitten, Kenneth R.; Regelin, Wayne L.

doi:10.7557/2.10.3.850

Cited by 49 publications

(63 citation statements)

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“…Flower buds of E. vaginatum are highly digestible and may be an important source of nitrogen and minerals for parturient cows (Kuropat and Bryant 1980;Fancy et al 1989;D. E. Russell, A. M. Martell, and W. A. Nixon, unpublished data).…”

Section: Discussionmentioning

confidence: 96%

“…Detailed descriptions of the range and seasonal movement patterns of the PCH can be found in Garner and Reynolds (1986) and Fancy et al (1989).…”

Section: Methodsmentioning

confidence: 99%

“…Transmitters were programmed to operate 6 ha d-' or 6 ha 2 d-', and provided three or four locations per day of operation. Mean location errors were 760 m for generation 2 transmitters (68% of locations used in this study) and 480 m for the newer generation-3 transmitters (32% of locations, Fancy et al 1989).…”

Section: Methodsmentioning

confidence: 99%

“…Data were received monthly from Service Argos (Landover, MD) and processed as described by Fancy et al (1988Fancy et al ( ,1989. The satellite transmitter package (Telonics, Inc., Mesa, AZ) weighed 1.6 kg (including a VHF radio transmitter to locate the caribou from an aircraft) and had a 1-year battery life.…”

Section: Methodsmentioning

confidence: 99%

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Selection of calving sites by Porcupine herd caribou

Fancy¹,

Whitten²

1991

Can. J. Zool.

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Characteristics of 305 calving sites used by 131 different radio-collared caribou (Rangifer tarandus) cows from the Porcupine herd in northeastern Alaska and the northern Yukon Territory were investigated between 1983 and 1990 to determine the factors influencing calving site selection. Cows selected areas north of the foothills primarily to reduce exposure of calves to predators. Sites dominated by Eriophorum tussocks were selected secondarily for access to newly emerging vegetation. Highest calf mortality occurred in years when snowmelt was relatively late and calving occurred closer to the foothills and in Canada. Industrial development of the coastal plain of the Arctic National Wildlife Refuge could increase calf mortality if calving were displaced south and east of potential development areas.

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Section: Discussionmentioning

confidence: 96%

“…Detailed descriptions of the range and seasonal movement patterns of the PCH can be found in Garner and Reynolds (1986) and Fancy et al (1989).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Selection of calving sites by Porcupine herd caribou

Fancy¹,

Whitten²

1991

Can. J. Zool.

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“…Therefore, we assumed that calving occurred between 5 and 25 May and examined data from each animal in each year to determine the shortest distance moved between successive locations during the period 5-25 May. We assumed that the date prior to this movement was the calving date (Fancy et al 1989;Fancy and Whitten 1991) and considered the location coordinates from that date to represent the calving site.…”

Section: Movement Rates and Calving-site Fidelitymentioning

confidence: 99%

Range use and movement rates of woodland caribou in Saskatchewan

Rettie¹,

Messier²

2001

Can. J. Zool.

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We employed satellite-telemetry data to examine seasonal movement rates, annual-and seasonal-range sizes, and season-to-season range fidelity of female woodland caribou (Rangifer tarandus caribou) from five populations in the boreal forest of Saskatchewan. The populations studied are limited by predation, and we investigated whether female caribou exhibited movement and range use consistent with predator avoidance. Additionally, we document an animal-centred technique for assessing site fidelity on the basis of individual range use throughout a year. Females accompanied by calves had lower movement rates and smaller seasonal ranges than females without calves. Movement rates among female caribou tended to decline between the rut and the postcalving and summer seasons. Trends indicated that seasonal ranges were larger prior to calving than during the postcalving and summer seasons. We interpreted the range sizes and movement rates observed as being consistent with predator avoidance in nonmigratory caribou populations. Despite these results and high rates of calf mortality in the area, we did not find interannual fidelity to calving sites.Résumé : Nous nous sommes servis de données de télémétrie par satellite pour étudier les taux des déplacements saisonniers, la taille des domaines annuels et saisonniers et la fidélité à un domaine chez des femelles du Caribou des bois (Rangifer tarandus caribou) de cinq populations dans la forêt boréale de la Saskatchewan. Les populations étu-diées sont limitées par la prédation et nous avons examiné si les déplacements et les domaines des femelles peuvent être reliés à leur évitement des prédateurs. De plus, nous décrivons une technique centrée sur les animaux pour évaluer leur fidélité à un site d'après l'utilisation de leur domaine pendant toute l'année. Les femelles accompagnées de petits ont des taux de déplacement plus faibles et leurs domaines saisonniers sont plus petits que ceux des femelles sans petits. Les taux de déplacement chez les femelles ont tendance à décliner entre le rut et la période qui suit la mise bas et durant l'été. Les tendances indiquent que les domaines saisonniers sont plus grands avant la mise bas que durant la période qui suit et durant l'été. Nous interprétons les dimensions des domaines et les taux de déplacement observés comme des stratégies d'évitement des prédateurs chez les populations non migratrices de caribous. Malgré ces résultats et malgré les taux de mortalité élevés des petits dans la région, nous n'avons pas constaté de fidélité aux sites de mise bas d'une année à l'autre.[Traduit par la Rédaction] 1940Rettie and Messier

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Habitat‐mediated timing of migration in polar bears: an individual perspective

Cherry

Derocher

Lunn

2016

Ecology and Evolution

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Migration phenology is largely determined by how animals respond to seasonal changes in environmental conditions. Our perception of the relationship between migratory behavior and environmental cues can vary depending on the spatial scale at which these interactions are measured. Understanding the behavioral mechanisms behind population‐scale movements requires knowledge of how individuals respond to local cues. We show how time‐to‐event models can be used to predict what factors are associated with the timing of an individual's migratory behavior using data from GPS collared polar bears (Ursus maritimus) that move seasonally between sea ice and terrestrial habitats. We found the concentration of sea ice that bears experience at a local level, along with the duration of exposure to these conditions, was most associated with individual migration timing. Our results corroborate studies that assume thresholds of >50% sea ice concentration are necessary for suitable polar bear habitat; however, continued periods (e.g., days to weeks) of exposure to suboptimal ice concentrations during seasonal melting were required before the proportion of bears migrating to land increased substantially. Time‐to‐event models are advantageous for examining individual movement patterns because they account for the idea that animals make decisions based on an accumulation of knowledge from the landscapes they move through and not simply the environment they are exposed to at the time of a decision. Understanding the migration behavior of polar bears moving between terrestrial and marine habitat, at multiple spatiotemporal scales, will be a major aspect of quantifying observed and potential demographic responses to climate‐induced environmental changes.

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Seasonal movements of caribou in arctic Alaska as determined by satellite

Cited by 49 publications

References 0 publications

Selection of calving sites by Porcupine herd caribou

Selection of calving sites by Porcupine herd caribou

Range use and movement rates of woodland caribou in Saskatchewan

Habitat‐mediated timing of migration in polar bears: an individual perspective

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