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During the past 30 years bull trout (Salvelinus confluentus ) populations have declined in various watersheds across their range. The decline has been attributed to loss of habitat, over harvesting, habitat disturbance from resource development activities, and interaction with exotic species. The declining population trends observed over the past three decades suggest that this species is sensitive to impacts. In response to these declines, bull trout are listed as "Threatened" in the United States and "Sensitive" in Alberta, British Columbia, and the Yukon Territory. In the Northwest Territories bull trout are listed as "May Be at Risk" and are a candidate for a detailed risk assessment in the area. The presence...
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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...
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Riverine sockeye salmon Oncorhynchus nerka (those that do not use nursery lakes for juvenile rearing) tend to be characterized by greater genetic diversity and weaker population structure than lake-type populations. These findings have led to the 'recurrent evolution' hypothesis for sockeye salmon life histories, which proposes that riverine sockeye salmon are the principal colonizing form and play the dominant role in the long-term persistence of sockeye salmon in a dynamic landscape. However, previous studies in Kamchatka (Russia) and Alaska have suggested that the general patterns of riverine sockeye salmon do not apply in all parts of the species' range. In this study, we examined genetic diversity and population...
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Two population oscillations dominate terrestrial community dynamics in northern Canada. In the boreal forest, the snowshoe hare (Lepus americanus) fluctuates in cycles with an 8–10 year periodicity and in tundra regions lemmings typically fluctuate in cycles with a 3–4 year periodicity. I review 60 years of research that has uncovered many of the causes of these population cycles, outline areas of controversy that remain and suggest key questions to address. Lemmings are keystone herbivores in tundra ecosystems because they are a key food resource for many avian and mammalian predators and are a major consumer of plant production. There remains much controversy over the role of predation, food shortage and social...
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Conservation of grizzly bears (Ursus arctos) is often controversial and the disagreement often is focused on the estimates of density used to calculate allowable kill. Many recent estimates of grizzly bear density are now available but field-based estimates will never be available for more than a small portion of hunted populations. Current methods of predicting density in areas of management interest are subjective and untested. Objective methods have been proposed, but these statistical models are so dependent on results from individual study areas that the models do not generalize well. We built regression models to relate grizzly bear density to ultimate measures of ecosystem productivity and mortality for interior...
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This report details the inventory of mammals in Lake Clark National Park and Preserve (LACL) between 7 and 31 July 2003 as part of a cooperative effort of the Beringian Coevolution Project at the Museum of Southwestern Biology, University of New Mexico and the Inventory and Monitoring Program of the National Park Service of Alaska. We begin the process of documenting the approximately 36 species of mammals that occur in the Park, with a primary focus on small mammals (i.e., shrews, voles, lemmings, weasels, porcupine, squirrels, and hares). This survey resulted in 856 primary specimens comprising 17 species. Across all localities sampled, two shrews (Sorex cinereus, S. monticolus) and a murid rodent (Clethrionomys...
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This report summarizes the inventory of mammals of three park units in the Southwest Alaska Network (SWAN) of the National Park Service, Alaska Region, in 2003 and 2004. This study was part of a cooperative effort of the Beringian Coevolution Project at the Museum of Southwestern Biology, University of New Mexico and the SWAN Inventory and Monitoring Program of the National Park Service of Alaska. We begin the process of documenting the approximately 38 species of mammals that occur in SWAN, with a primary focus on small mammals (i.e., shrews, voles, lemmings, weasels, porcupine, squirrels, and hares). This survey resulted in over 2000 primary specimens comprising 18 small mammal species. Small mammal captures varied...


map background search result map search result map Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) in Kluane, Yukon CHEMICAL COMPOSITION OF LICK SOILS: FUNCTIONS OF SOIL INGESTION BY FOUR UNGULATE SPECIES Predicting Grizzly Bear Density in Western North America Geographical Variation in Antler Morphology of Alaskan Moose: Putative Effects of Habitat and Genetics Of lemmings and snowshoe hares: the ecology of northern Canada Distribution, life history, and habitat use of bull trout ( Salvelinus confluentus) in mountain streams of the southern and central Northwest Territories Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008 Concluding Remarks: what do we Need to Know about Bats in Northwestern North America? Moose survey: Dawson early-winter 2008 Moose Survey: Upper Klondike Highway Moose Management Unit, late winter 2010 Estimating snowshoe hare population density from pellet plots: a further evaluation Sockeye salmon retain immunoglobulin-secreting plasma cells throughout their spawning journey and post-spawning Genetic Diversity and Population Structure in the Kuskokwim River Drainage Support the Recurrent Evolution Hypothesis for Sockeye Salmon Life Histories The ecology of snowshoe hares in northern boreal forests Mammal Inventory of Alaskas National Parks and Preserves, Lake Clark National Park and Preserve, Annual Report 2003 Mammal inventory of Alaska's National Parks and Preserves, Southwest Alaska Network: Kenai Fjords National Park, Lake Clark National Park and Preserve, and Katmai National Park and Preserve Is the relationship between predator and prey abundances related to climate for lynx and snowshoe hares? 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 Moose survey: Dawson early-winter 2008 Sockeye salmon retain immunoglobulin-secreting plasma cells throughout their spawning journey and post-spawning Moose Survey: Upper Klondike Highway Moose Management Unit, late winter 2010 Is the relationship between predator and prey abundances related to climate for lynx and snowshoe hares? Mammal Inventory of Alaskas National Parks and Preserves, Lake Clark National Park and Preserve, Annual Report 2003 Mammal inventory of Alaska's National Parks and Preserves, Southwest Alaska Network: Kenai Fjords National Park, Lake Clark National Park and Preserve, and Katmai National Park and Preserve Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Evaluation of wolf density estimation from radiotelemetry data Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008 Distribution, life history, and habitat use of bull trout ( Salvelinus confluentus) in mountain streams of the southern and central Northwest Territories Estimating snowshoe hare population density from pellet plots: a further evaluation The ecology of snowshoe hares in northern boreal forests Genetic Diversity and Population Structure in the Kuskokwim River Drainage Support the Recurrent Evolution Hypothesis for Sockeye Salmon Life Histories Geographical Variation in Antler Morphology of Alaskan Moose: Putative Effects of Habitat and Genetics CHEMICAL COMPOSITION OF LICK SOILS: FUNCTIONS OF SOIL INGESTION BY FOUR UNGULATE SPECIES Predicting Grizzly Bear Density in Western North America Concluding Remarks: what do we Need to Know about Bats in Northwestern North America? Of lemmings and snowshoe hares: the ecology of northern Canada