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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...
Population dynamics of Canada lynx (Lynx canadensis) have been of interest to ecologists for nearly sixty years. Two competing hypotheses concerning lynx population dynamics and large-scale spatial synchrony are currently debated. The first suggests that dispersal is substantial among lynx populations, and the second proposes that lynx at the periphery of their range exist in small, isolated patches that maintain cycle synchrony via correlation with extrinsic environmental factors. Resolving the nature of lynx population dynamics and dispersal is important both to ecological theory and to the conservation of threatened lynx populations: the lack of knowledge about connectivity between populations at the southern...
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The St. Elias region of North America occupies portions of British Columbia, Alaska, and Yukon and consists of a contiguous network of protected areas. Available information on avian and mammalian diversity in each of the region's five major protected areas (Kluane National Park, Wrangell-St. Elias National Park and Preserve, Glacier Bay National Park and Preserve, Tatshenshini-Alsek Provincial Park, and Tetlin National Wildlife Refuge) was integrated to create a species checklist as part of an ongoing effort to create a region-wide ecological database for research and management purposes. Based on the tabulated data, the five protected areas combine to protect a total of 178 species of breeding birds and 51 species...
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Pilfering is thought to play a role in the evolution of scatter-hoarding strategies; but is not well understood in larder-hoarding animals. I studied intraspecific pilfering in red squirrels in Kluane, YT, Canada. The purpose of this project was to estimate the natural rate of cache pilferage, and to examine variation in pilfering behaviour. Results from experimental removal of territory owners, suggested that younger squirrels with smaller food caches were more likely to pilfer when given the opportunity. Survival over-winter was dependent on the number of cones cached and pilfering squirrels were less likely to survive. Using a mark-recapture study of marked cones I found that few individuals (14%) did any pilfering...
Abstract (from Wiley Online Library): Annual distributions of waterfowl during the nonbreeding period can influence ecological, cultural, and economic relationships. We used previously developed Weather Severity Indices (WSI) that explained migration by dabbling ducks in eastern North America and weather data from the North American Regional Reanalysis to develop an open-access internet-based tool (i.e., WSI web app) to visualize and query WSI data. We used data generated by the WSI web app to determine whether the weather known to elicit southerly migration by dabbling ducks had changed, from October to April 1979 to 2013. We detected that the amount of area in the Mississippi and Atlantic Flyways with weather...
Although scientists have identified many ways to reduce the negative effects of climate change on wildlife, this information is not readily available to natural resource managers. For successful wildlife adaptation to climate change, natural resource managers should have current, peerreviewed information to guide their decisions. We conducted a review of over 1300 publications for recommendations to manage wildlife in the face of climate change. We then summarized the findings as the wildlife adaptation menu, a tool to inform planning and decision-making in an accessible format.
map background search result map search result map An isotopic approach to measuring nitrogen balance in caribou Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) in Kluane, Yukon Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon The Ecological Future of the North American Bison: Conceiving Long-Term, Large-Scale Conservation of Wildlife Birds and Mammals of the St. Elias Mountain Parks: Checklist Evidence for a Biogeographic Convergence Zone Concluding Remarks: what do we Need to Know about Bats in Northwestern North America? Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) The ecology of snowshoe hares in northern boreal forests Predation on moose and caribou by a regulated wolf population Summer diet of caribou in southern Yukon 5000 years BP to present Evaluation of wolf density estimation from radiotelemetry data Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) in Kluane, Yukon Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Evaluation of wolf density estimation from radiotelemetry data An isotopic approach to measuring nitrogen balance in caribou The ecology of snowshoe hares in northern boreal forests Predation on moose and caribou by a regulated wolf population Birds and Mammals of the St. Elias Mountain Parks: Checklist Evidence for a Biogeographic Convergence Zone Summer diet of caribou in southern Yukon 5000 years BP to present Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) The Ecological Future of the North American Bison: Conceiving Long-Term, Large-Scale Conservation of Wildlife Concluding Remarks: what do we Need to Know about Bats in Northwestern North America?