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Nutritional restrictions in winter may reduce the availability of protein for reproduction and survival in northern ungulates. We refined a technique that uses recently voided excreta on snow to assess protein status in wild caribou (Rangifer tarandus) in late winter. Our study was the first application of this non-invasive, isotopic approach to assess protein status of wild caribou by determining dietary and endogenous contributions of nitrogen (N) to urinary urea. We used isotopic ratios of N (?15N) in urine and fecal samples to estimate the proportion of urea N derived from body N (p-UN) in pregnant, adult females of the Chisana Herd, a small population that ranged across the Alaska-Yukon border. We took advantage...
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North American caribou (Rangifer tarandus) herds commonly exhibit little nuclear genetic differentiation among adjacent herds, although available evidence supports strong demographic separation, even for herds with seasonal range overlap. During 1997–2003, we studied the Mentasta and Nelchina caribou herds in south-central Alaska using radiotelemetry to determine individual movements and range overlap during the breeding season, and nuclear and mitochondrial DNA (mtDNA) markers to assess levels of genetic differentiation. Although the herds were considered discrete because females calved in separate regions, individual movements and breeding-range overlap in some years provided opportunity for male-mediated gene...
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The fundamental niche of a species is rarely if ever realized because the presence of other species restricts it to a narrower range of ecological conditions. The effects of this narrower range of conditions define how resources are partitioned. Resource partitioning has been inferred but not demonstrated previously for sympatric ursids. We estimated assimilated diet in relation to body condition (body fat and lean and total body mass) and reproduction for sympatric brown bears (Ursus arctos) and American black bears (U. americanus) in south-central Alaska, 1998?2000. Based on isotopic analysis of blood and keratin in claws, salmon (Oncorhynchus spp.) predominated in brown bear diets (>53% annually) whereas black...
map background search result map search result map An isotopic approach to measuring nitrogen balance in caribou Extraordinary movements of the Denali caribou herd following the perfect storm Ranking Alaska Moose Nutrition: Signals to Begin Liberal Antlerless Harvests Utility of stable isotope analysis in studying foraging ecology of herbivores: examples from moose and caribou Are inland wolf—ungulate systems influenced by marine subsidies of Pacific salmon? Marrow Fat Deposition and Skeletal Growth in Caribou Calves Winter habitat use by female caribou in relation to wildland fires in interior Alaska Variation in growth and survival of young female caribou Population dynamics of wolves and their prey in Denali National Park, Alaska: progress report (May 1998 - April 2000) Population dynamics of wolves and their prey in Denali National Park, Alaska: progress report (May 2000 - April 2001) Range overlap and individual movements during breeding season influence genetic relationships of caribou herds in south-central Alaska Chisana Caribou Census: 13-14 October 2007 Fire, Grazing History, Lichen Abundance, and Winter Distribution of Caribou in Alaska's Taiga Simulating the Influences of various Fire Regimes on Caribou Winter Habitat Evaluation of wolf density estimation from radiotelemetry data Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS Range expansion of moose in arctic Alaska linked to warming and increased shrub habitat Fire, Grazing History, Lichen Abundance, and Winter Distribution of Caribou in Alaska's Taiga Chisana Caribou Census: 13-14 October 2007 Ranking Alaska Moose Nutrition: Signals to Begin Liberal Antlerless Harvests Utility of stable isotope analysis in studying foraging ecology of herbivores: examples from moose and caribou Are inland wolf—ungulate systems influenced by marine subsidies of Pacific salmon? Marrow Fat Deposition and Skeletal Growth in Caribou Calves Population dynamics of wolves and their prey in Denali National Park, Alaska: progress report (May 1998 - April 2000) Population dynamics of wolves and their prey in Denali National Park, Alaska: progress report (May 2000 - April 2001) Evaluation of wolf density estimation from radiotelemetry data Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou Extraordinary movements of the Denali caribou herd following the perfect storm Range overlap and individual movements during breeding season influence genetic relationships of caribou herds in south-central Alaska Variation in growth and survival of young female caribou An isotopic approach to measuring nitrogen balance in caribou Winter habitat use by female caribou in relation to wildland fires in interior Alaska Simulating the Influences of various Fire Regimes on Caribou Winter Habitat INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS Range expansion of moose in arctic Alaska linked to warming and increased shrub habitat