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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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Studies moose or Alces alces, caribou or Rangifer tarandus and grizzly bear or Ursus arctos distribution in relation to road traffic in Denali National Park, Alaska. Development of wildlife monitoring system using 19 landscape level viewsheds stratified into four sections based on decreasing traffic along the road corridor; Absence of traffic avoidance patterns for caribou and grizzly bears.
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Originating from different activities that were part of the University of Alaska’s contribution to the Fourth International Polar Year, this interdisciplinary volume addresses a host of current concerns regarding the rapid transformation of the Arctic and its impacts on people and ecosystems. Close to a hundred contributors with a broad range of backgrounds examine Arctic change from an Alaska perspective, providing insight into different approaches of evaluating and preparing for environmental and socio-economic change. Thanks to its coverage of important social-ecological systems and processes, including fresh water, marine resources, the coasts, and oil and gas development, this volume explores opportunities...
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Ongoing and rapid environmental change within western and northern Canada is of major societal and scientific concern and has local- to global-scale implications. There is an urgent need to understand the changes and develop improved diagnostic and predictive modeling tools to manage uncertain futures.
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The 2002 Mw 7.9 Denali Fault earthquake, Alaska, provides an unparalleled opportunity to investigate in quantitative detail the regional hillslope mass-wasting response to strong seismic shaking in glacierized terrain. We present the first detailed inventory of ∼1580 coseismic slope failures, out of which some 20% occurred above large valley glaciers, based on mapping from multi-temporal remote sensing data. We find that the Denali earthquake produced at least one order of magnitude fewer landslides in a much narrower corridor along the fault ruptures than empirical predictions for an M ∼8 earthquake would suggest, despite the availability of sufficiently steep and dissected mountainous topography prone to frequent...
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Previous studies indicate streams in the watershed of Anchorage, AK, contain elevated concentrations of several Potentially Toxic Metals (PTMs) in the water, suspended and streambed sediment and benthic macro invertebrates. This study investigated the sources, distribution, and uptake of PTMs by aquatic organisms in the watershed and their relationship to land-use patterns. Sampling sites were chosen that represent the watercourses of each of the four major streams in Anchorage. Water, streambed sediment, various species of benthic macroinvertebrates and slimy sculpin ( Cottus cognatus ) were collected throughout the summer of 2005. A lake sediment core was also collected from Campbell Lake to assess PTM deposition...
map background search result map search result map Biological escapement goal for Anvik River chum salmon Late Wisconsinan McConnell glaciation of the Whitehorse map area (105D), Yukon The geophysical character of southern Alaska—Implications for crustal evolution North by 2020: perspectives on Alaska's changing social-ecological systems Health Impact Assessment for Proposed Coal Mine at Wishbone Hill, Matanuska-Susitna Borough Alaska. Prepared For: Alaska Department of Health and Social Services, Health Impact Assessment Program 2008 Campbell Tract Non-native Plant Survey: Revisiting permanent monitoring transects established in 2006. Report funded and prepared for Bureau of Land Management Alaska State Office Biogeography of select avian species in Alaska’s National Parks Observation, Diagnosis, and Prediction of Environmental Change in Northwestern Canada An isotopic approach to measuring nitrogen balance in caribou Differences in Ecosystem Carbon Distribution and Nutrient Cycling Linked to Forest Tree Species Composition in a Mid-Successional Boreal Forest Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska Population characteristics, space use and habitat selection of two non-migratory caribou herds in central Alaska, 1994 - 2009 Moose, Caribou, and Grizzly Bear Distribution in Relation to Road Traffic in Denali National Park, Alaska Downstream Migrations of Juvenile Salmon and Other Fishes in the Upper Yukon River Why so few? Landslides triggered by the 2002 Denali earthquake, Alaska Yukon Southern Lakes Nest Box Project Report, 2000 ASSESSMENT REPORT for EXPLORATION on the ANNE 1 to 4 QUARTZ MINING CLAIMS, MARSH LAKE, YUKON TERRITORY between April, 2005 and April, 2006 Biogeochemical pathways and land use associations of potentially toxic metals in the Anchorage watershed, Alaska Sonar estimation of chum salmon passage in the Aniak River, 2009 Evidence of soil nutrient availability as the proximate constraint on growth of treeline trees: Reply 2008 Campbell Tract Non-native Plant Survey: Revisiting permanent monitoring transects established in 2006. Report funded and prepared for Bureau of Land Management Alaska State Office Health Impact Assessment for Proposed Coal Mine at Wishbone Hill, Matanuska-Susitna Borough Alaska. Prepared For: Alaska Department of Health and Social Services, Health Impact Assessment Program Differences in Ecosystem Carbon Distribution and Nutrient Cycling Linked to Forest Tree Species Composition in a Mid-Successional Boreal Forest Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska Biogeochemical pathways and land use associations of potentially toxic metals in the Anchorage watershed, Alaska ASSESSMENT REPORT for EXPLORATION on the ANNE 1 to 4 QUARTZ MINING CLAIMS, MARSH LAKE, YUKON TERRITORY between April, 2005 and April, 2006 Sonar estimation of chum salmon passage in the Aniak River, 2009 Biological escapement goal for Anvik River chum salmon Late Wisconsinan McConnell glaciation of the Whitehorse map area (105D), Yukon Moose, Caribou, and Grizzly Bear Distribution in Relation to Road Traffic in Denali National Park, Alaska Evidence of soil nutrient availability as the proximate constraint on growth of treeline trees: Reply Yukon Southern Lakes Nest Box Project Report, 2000 An isotopic approach to measuring nitrogen balance in caribou Why so few? Landslides triggered by the 2002 Denali earthquake, Alaska Population characteristics, space use and habitat selection of two non-migratory caribou herds in central Alaska, 1994 - 2009 North by 2020: perspectives on Alaska's changing social-ecological systems The geophysical character of southern Alaska—Implications for crustal evolution Observation, Diagnosis, and Prediction of Environmental Change in Northwestern Canada Downstream Migrations of Juvenile Salmon and Other Fishes in the Upper Yukon River Biogeography of select avian species in Alaska’s National Parks