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In 1989, the Chisana caribou (Rangifer tarandus) herd in the northern Wrangell Mountains, Alaska, U.S.A., declined substantially in population size and productivity. Grasses, sedges, forbs, and willows (Salix spp.) are critical components of the diet of caribou in spring and summer, and the abundance and quality of forage are influenced by climate. To evaluate effects of climatic variation on caribou forage we conducted a field experiment in subarctic tundra where light, air temperature, and precipitation were manipulated. We used a plastic tarpaulin to increase air temperature and decrease precipitation. We also decreased light intensity with a shade cloth and increased precipitation by adding water to determine...
In 1989, the Chisana caribou (Rangifer tarandus) herd in the northern Wrangell Mountains, Alaska, U.S.A., declined substantially in population size and productivity. Grasses, sedges, forbs, and willows (Salix spp.) are critical components of the diet of caribou in spring and summer, and the abundance and quality of forage are influenced by climate. To evaluate effects of climatic variation on caribou forage we conducted a field experiment in subarctic tundra where light, air temperature, and precipitation were manipulated. We used a plastic tarpaulin to increase air temperature and decrease precipitation. We also decreased light intensity with a shade cloth and increased precipitation by adding water to determine...
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Wood bison (Bison bison athabascae ) were reintroduced into southwestern Yukon as part of a national recovery program in the late 1980s. The Yukon Bison Management Plan identified potential impacts of the reintroduced bison on other ecosystem components as a priority management issue. In particular, local residents expressed concern for the indirect effects of bison on the Aishihik woodland caribou ( Rangifer tarandus caribou ) herd resulting from competition for space and forage during late winter. This project assessed the potential for exploitative competition between bison and caribou by determining resource selection (i.e., use vs. availability) and overlap in resource use across 3 spatial scales: the landscape,...
Wood bison (Bison bison athabascae ) were reintroduced into southwestern Yukon as part of a national recovery program in the late 1980s. The Yukon Bison Management Plan identified potential impacts of the reintroduced bison on other ecosystem components as a priority management issue. In particular, local residents expressed concern for the indirect effects of bison on the Aishihik woodland caribou ( Rangifer tarandus caribou ) herd resulting from competition for space and forage during late winter. This project assessed the potential for exploitative competition between bison and caribou by determining resource selection (i.e., use vs. availability) and overlap in resource use across 3 spatial scales: the landscape,...
    map background search result map search result map Late winter resource selection and the potential for competition between wood bison and woodland caribou in the Yukon Climate change and caribou: Effects of summer weather on forage Late winter resource selection and the potential for competition between wood bison and woodland caribou in the Yukon Climate change and caribou: Effects of summer weather on forage