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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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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...
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...
Climatic warming has direct implications for fire-dominated disturbance patterns in northern ecosystems. A transforming wildfire regime is altering plant composition and successional patterns, thus affecting the distribution and potentially the abundance of large herbivores. Caribou (Rangifer tarandus) are an important subsistence resource for communities throughout the north and a species that depends on terrestrial lichen in late-successional forests and tundra systems. Projected increases in area burned and reductions in stand ages may reduce lichen availability within caribou winter ranges. Sufficient reductions in lichen abundance could alter the capacity of these areas to support caribou populations. To assess...
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Climatic warming has direct implications for fire-dominated disturbance patterns in northern ecosystems. A transforming wildfire regime is altering plant composition and successional patterns, thus affecting the distribution and potentially the abundance of large herbivores. Caribou (Rangifer tarandus) are an important subsistence resource for communities throughout the north and a species that depends on terrestrial lichen in late-successional forests and tundra systems. Projected increases in area burned and reductions in stand ages may reduce lichen availability within caribou winter ranges. Sufficient reductions in lichen abundance could alter the capacity of these areas to support caribou populations. To assess...
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...
    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 Marrow Fat Deposition and Skeletal Growth in Caribou Calves Winter habitat use by female caribou in relation to wildland fires in interior Alaska Climate-Driven Effects of Fire on Winter Habitat for Caribou in the Alaskan-Yukon Arctic 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 Dynamics of the Denali Caribou Herd, Denali National Park, Alaska Progress Report (October 2011-September 2012) Chisana Caribou Census: 13-14 October 2007 Chisana Caribou Census: 13-14 October 2007 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) Dynamics of the Denali Caribou Herd, Denali National Park, Alaska Progress Report (October 2011-September 2012) 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 An isotopic approach to measuring nitrogen balance in caribou Winter habitat use by female caribou in relation to wildland fires in interior Alaska Climate-Driven Effects of Fire on Winter Habitat for Caribou in the Alaskan-Yukon Arctic