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These data represent trapping effort and captures of deer mice at Point Reyes National Seashore, Marin County, California. Deer mice were captured and marked with ear tags to allow identification of individuals. The location of captures can be used in a spatially explicit capture recapture model to estimate density of mice and how mouse density varies by site and habitat type.
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Harbor porpoise, Phocoena phocoena vomerina, in Cook Inlet, Alaska, are managed as part of the Gulf ofAlaska (GOA) stock. It is not known if this population is distinct from porpoise in the GOA stock found outside Cook Inlet. No long- term dedicated studies of harbor porpoise have occurred in Cook In let. The objective here is to provide a summary of occurrence in Cook Inlet derived from archaeological data, anecdotal reports, and systematic surveys. Maps were created for each dataset. Therefore, each of these estimates is likely biased downward. In the last decade the region has seen expansion of the Port of Anchorage, proposals to build a bridge crossing Knik Arm, plans to develop mining operations and supporting...
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The fundamental niche of a species is rarely if ever realized because the presence of other species restricts it to a narrower range of ecological conditions. The effects of this narrower range of conditions define how resources are partitioned. Resource partitioning has been inferred but not demonstrated previously for sympatric ursids. We estimated assimilated diet in relation to body condition (body fat and lean and total body mass) and reproduction for sympatric brown bears (Ursus arctos) and American black bears (U. americanus) in south-central Alaska, 1998?2000. Based on isotopic analysis of blood and keratin in claws, salmon (Oncorhynchus spp.) predominated in brown bear diets (>53% annually) whereas black...
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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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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...
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This report summarizes the inventory of mammals of the five park units comprising the Arctic Network (ARCN) of the National Park Service, Alaska Region, between 2000 and 2003. 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 ARCN Inventory and Monitoring Program of the National Park Service, Alaska division. We begin documenting the approximately 39 species of mammals that live in ARCN, with a primary focus on small mammals (i.e., shrews, voles, lemmings, weasels, porcupine, squirrels, and hares). This survey resulted in more than 3,000 primary specimens comprising 23 species. Small mammal abundance varied considerably...
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 Moose: Competing and Complementary Values Population Structure and Genetic Diversity of Moose in Alaska Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Genetic variation in caribou and reindeer (Rangifer tarandus ) 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? Mammal inventory of Alaska's National Parks and Preserves, Arctic Network: Bering Land Bridge National Park, Cape Krusenstern National Monument, Kobuk Valley National Park, Noatak National Park, and Gates of the Arctic National Park and PreservePark and Preserve 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 Harbor Porpoise, Phocoena phocoena vomerina, in Cook Inlet, Alaska Evaluation of wolf density estimation from radiotelemetry data Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS Seasonal foraging strategies of Alaskan gray wolves (<i>Canis lupus</i>) in a salmon subsidized ecosystem Captures and Trapping Effort for Deer Mice (Peromyscus sonoriensis) at Point Reyes National Seashore, California, USA from 2021 to 2022 Captures and Trapping Effort for Deer Mice (Peromyscus sonoriensis) at Point Reyes National Seashore, California, USA from 2021 to 2022 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 Seasonal foraging strategies of Alaskan gray wolves (<i>Canis lupus</i>) in a salmon subsidized ecosystem 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 Harbor Porpoise, Phocoena phocoena vomerina, in Cook Inlet, Alaska Mammal inventory of Alaska's National Parks and Preserves, Arctic Network: Bering Land Bridge National Park, Cape Krusenstern National Monument, Kobuk Valley National Park, Noatak National Park, and Gates of the Arctic National Park and PreservePark and Preserve The ecology of snowshoe hares in northern boreal forests Predation on moose and caribou by a regulated wolf population INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS Population Structure and Genetic Diversity of Moose in Alaska Summer diet of caribou in southern Yukon 5000 years BP to present Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) Genetic variation in caribou and reindeer (Rangifer tarandus ) Moose: Competing and Complementary Values 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?