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In North America, the last ice age is the most recent event with severe consequences on boreal species’ ranges. Phylogeographic patterns of range expansion in trembling aspen (Populus tremuloides) suggested that Beringia is likely to be a refugium and the “ice-free corridor” in Alberta may represent a region where small populations persisted during the last glacial maximum (LGM). The purpose of this study was to ascertain whether the origins of trembling aspen in western North America are reflected in the patterns of neutral genetic diversity and population structure. A total of 28 sites were sampled covering the northwestern part of aspen’s distribution, from Saskatchewan to Alaska. Twelve microsatellite markers...
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The contents of this report include: an update on Board membership and staff; a description of the draft implementation strategy to the Plan; the Planning Board's priorities for 2004-2005; a review of land use permits and water licences issued, and an explanation of how an approved Plan has affected those acivities; a list of action items that are currently being addressed; recommendations for groups to consider in the next year; the Planning Board's work plan for 2003-2004, and; the audited financial statements for 2003-2004. ... All regulatory agencies have to ensure that all licensed, permitted, and othe authorized activities related to the use of land, water, and the deposit of waste conform with the Plan. The...
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This thesis investigates the theory and practice of integration in resource and environmental management. Research on integration is growing as a result of the escalating demands placed on resources, an increase in the quality and quantity of information available concerning the environment, and the increased involvement and coordination of partners and participants in resource and environmental decision-making. Focus is placed on several resource and environmental management processes in the Southwest Yukon, including wildlife management, protected areas management, forest management and environmental assessment. A case study approach is utilized to examine the perception and practical application of integration...
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Lake sediment cores collected from four lakes (Upper Fly Lake 61.04°N, 138.09°W, 1326 m a.s.l.; Jenny Lake 61.04°N, 138.36°W, 817 m. a.s.l.; Donjek Kettle 61.69°N, 139.76°W, 732 m a.s.l.; Lake WP02 61.48°N, 139.97°W, 1463 m a.s.l.) in the southwest Yukon provide records of postglacial climatic variability in the region. A 13,000 year pollen record from Upper Fly Lake indicated that herbaceous tundra existed on the landscape from 13.6 to 11 ka, followed by birch shrub tundra until 10 ka, when Picea forests were established in the region. Pollen-, chironomid-, and ostracode-inferred paleoclimate reconstructions showed a long-term cooling with increasing moisture from the late glacial through the Holocene. The early...
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In glacier-fed systems climate change may have various effects over a range of time scales, including increasing river discharge, flood frequency and magnitude. This study uses a combination of empirical monitoring and modelling to project the impacts of climate change on the glacial-fed Middle Fork Toklat River, Denali National Park, Alaska. We use a regional calibration of the model HBV to account for a paucity of long term observed flow data, validating a local application using glacial mass balance data and summer flow records. Two Global Climate Models (HADCM3 and CGCM2) and two IPCC scenarios (A2 and B2) are used to ascertain potential changes in meteorological conditions, river discharge, flood frequency...
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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...
map background search result map search result map A First Approximation of Holocene Inter-Assemblage Variability in Central Alaska An isotopic approach to measuring nitrogen balance in caribou The Significance of Shifts in Precipitation Patterns: Modelling the Impacts of Climate Change and Glacier Retreat on Extreme Flood Events in Denali National Park, Alaska Competitive interactions across a soil fertility gradient in a multispecies forest Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring The effect of fire and permafrost interactions on soil carbon accumulation in an upland black spruce ecosystem of interior Alaska: implications for post-thaw carbon loss Species Listing under Canada's Species at Risk Act TADAM: A dynamic whole-stand approximation for the TASS growth model. (Erratum: 2005 Nov-Dec, v. 81, no. 6, p. 815.) Assessing integration in resource and environmental management in the Southwest Yukon Exploring the sensitivity of soil carbon dynamics to climate change, fire disturbance and permafrost thaw in a black spruce ecosystem Monsoma pulveratum (Retzius) (Hymenoptera: Tenthredinidae) Allantinae), a Palearctic sawfly defoliator of alder in Alaska and new to the United States Annual report of the Gwich'in Land Use Planning Board, April 2003 - March 2004 Alder (Alnus crispa) effects on soils in ecosystems of the Agashashok River valley, northwest Alaska Evaluating GCM outputs for past climates in North America based on the distribution of Sphagnum peatlands Holocene environmental variability inferred from lake sediments, southwest Yukon Territory, Canada Use of remote sensing to identify areas of groundwater upwelling on active glacial floodplains: Their frequency, extent and significance on a landscape scale Spruce beetles and forest ecosystems of south-central Alaska Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska Soil nitrogen transformations and retention during a deciduous to coniferous successional transition Fine-scale assessment of genetic diversity of trembling aspen in northwestern North America Soil nitrogen transformations and retention during a deciduous to coniferous successional transition Holocene environmental variability inferred from lake sediments, southwest Yukon Territory, Canada Exploring the sensitivity of soil carbon dynamics to climate change, fire disturbance and permafrost thaw in a black spruce ecosystem Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring Alder (Alnus crispa) effects on soils in ecosystems of the Agashashok River valley, northwest Alaska Assessing integration in resource and environmental management in the Southwest Yukon Use of remote sensing to identify areas of groundwater upwelling on active glacial floodplains: Their frequency, extent and significance on a landscape scale An isotopic approach to measuring nitrogen balance in caribou Spruce beetles and forest ecosystems of south-central Alaska A First Approximation of Holocene Inter-Assemblage Variability in Central Alaska The effect of fire and permafrost interactions on soil carbon accumulation in an upland black spruce ecosystem of interior Alaska: implications for post-thaw carbon loss Annual report of the Gwich'in Land Use Planning Board, April 2003 - March 2004 Monsoma pulveratum (Retzius) (Hymenoptera: Tenthredinidae) Allantinae), a Palearctic sawfly defoliator of alder in Alaska and new to the United States The Significance of Shifts in Precipitation Patterns: Modelling the Impacts of Climate Change and Glacier Retreat on Extreme Flood Events in Denali National Park, Alaska Competitive interactions across a soil fertility gradient in a multispecies forest Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska TADAM: A dynamic whole-stand approximation for the TASS growth model. (Erratum: 2005 Nov-Dec, v. 81, no. 6, p. 815.) Evaluating GCM outputs for past climates in North America based on the distribution of Sphagnum peatlands Species Listing under Canada's Species at Risk Act Fine-scale assessment of genetic diversity of trembling aspen in northwestern North America