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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...
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This report presents a historical survey of the caribou population of British Columbia, based largely on written sources such as explorers' accounts, scientific articles, and archival records. Results are presented by ecoprovince for northern, mountain, and boreal caribou. The current geographic distribution of the species is discussed along with historic trends in the change in the caribou populations. Threats to these populations are also described, including habitat loss, predation, hunting, weather & disease, and land use impacts. The appendix contains a report on the Queen Charlotte Islands population of caribou, now extinct.
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A large barren-ground caribou (Rangifer tarandus granti) population (the Bering Seacoast Herd) historically ranged across southwest Alaska. The size of this herd peaked in the early 1860s but declined by the late 1880s. Caribou numbers remained low in southwest Alaska for the next 100 years. Biologists have argued that periodic dispersal has been an important factor in caribou population dynamics. However, others conclude there was no credible evidence that significant interchange between herds has ever occurred in Alaska. Since 1981, we monitored 318 radiocollared caribou and documented dramatic population growth, erratic movements, shifts from traditional ranges, and changes in migratory behavior. We also documented...
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Caribou (Rangifer tarandus) are an integral part of the ecological and cultural fabric of northwest Alaska. Western Arctic Herd (WAH) caribou roam over this entire region, including all 5 Arctic Network Inventory and Monitoring Program (ARCN) National Park Units. Conservation of healthy caribou populations are specifically mentioned within the enabling legislation (Alaska National Interested Lands Conservation Act or ANILCA) of three of these Parks and is of critical concern to subsistence hunters within this region. Caribou are, by far, the most abundant large mammal in northwest Alaska and are famous for their long-distance migrations and large population oscillations. For these reasons, ARCN chose WAH caribou...
map background search result map search result map The 1998-99 harvest of moose, caribou, and bear in ten middle Yukon and Koyukuk River communities The early history of woodland caribou (Rangifer tarandus caribou) in British Columbia Effects of oil field development on calf production and survival in the central arctic caribou herd: Interim research technical report, 1 July 2001 - 30 September 2003 Ecology of boreal woodland caribou in the lower Mackenzie Valley, NT: work completed in the Inuvik region, April 2003 to November 2004 Central Arctic caribou and petroleum development: distributional, nutritional, and reproductive implications INFLUENCE OF POPULATION GROWTH ON CARIBOU HERD IDENTITY, CALVING GROUND FIDELITY, AND BEHAVIOR Changes in vegetative cover on Western Arctic Herd winter range from 1981 to 2005: potential effects of grazing and climate change Arctic Network Caribou Monitoring Protocol Development Summary Range ecology of the Porcupine caribou herd in Canada Chisana Caribou Range Lichen Assessment, September, 2011 Caribou vital sign annual report for the Arctic Network Inventory and Monitoring Program: September 2011-August 2012 Nutritional implications of increased shrub cover for caribou (Rangifer tarandus) in the Arctic Range assessment as a cumulative effects management tool: Assessment of the Carcross Caribou Herd Range in Yukon. Prepared for: Environment Yukon Fish and Wildlife Branch Regional Programs Simulating the Influences of various Fire Regimes on Caribou Winter Habitat Genetic diversity in caribou linked to past and future climate change Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou Interpreting Resource Selection at Different Scales for Woodland Caribou in Winter Climate change and caribou: Effects of summer weather on forage An integrated assessment of Porcupine caribou seasonal distribution, movements, and habitat preferences for regional land use planning in northern Yukon Territory, Canada Nutritional implications of increased shrub cover for caribou (Rangifer tarandus) in the Arctic Chisana Caribou Range Lichen Assessment, September, 2011 Effects of maternal characteristics and climatic variation on birth masses of Alaskan caribou An integrated assessment of Porcupine caribou seasonal distribution, movements, and habitat preferences for regional land use planning in northern Yukon Territory, Canada Climate change and caribou: Effects of summer weather on forage Interpreting Resource Selection at Different Scales for Woodland Caribou in Winter Simulating the Influences of various Fire Regimes on Caribou Winter Habitat Effects of oil field development on calf production and survival in the central arctic caribou herd: Interim research technical report, 1 July 2001 - 30 September 2003 Central Arctic caribou and petroleum development: distributional, nutritional, and reproductive implications Range ecology of the Porcupine caribou herd in Canada Arctic Network Caribou Monitoring Protocol Development Summary Caribou vital sign annual report for the Arctic Network Inventory and Monitoring Program: September 2011-August 2012 The 1998-99 harvest of moose, caribou, and bear in ten middle Yukon and Koyukuk River communities Changes in vegetative cover on Western Arctic Herd winter range from 1981 to 2005: potential effects of grazing and climate change INFLUENCE OF POPULATION GROWTH ON CARIBOU HERD IDENTITY, CALVING GROUND FIDELITY, AND BEHAVIOR Range assessment as a cumulative effects management tool: Assessment of the Carcross Caribou Herd Range in Yukon. Prepared for: Environment Yukon Fish and Wildlife Branch Regional Programs Ecology of boreal woodland caribou in the lower Mackenzie Valley, NT: work completed in the Inuvik region, April 2003 to November 2004 The early history of woodland caribou (Rangifer tarandus caribou) in British Columbia Genetic diversity in caribou linked to past and future climate change