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One of the proposed explanations for the recent continental decline in Lesser Scaup (Aythya affinis) populations is that females experience lower survival or reproduction resulting from exposure to contaminants in their diet of exotic bivalves during migration and over winter. In 1999, we collected eggs and females from five sites in the boreal forest of Canada and Alaska and four sites in Canadian parkland. We analyzed eggs from 60 clutches and ten nesting females for toxic metals, selenium, 19 pesticides and other organochlorines, and 43 polychlorinated biphenyl (PCB) congeners. The highest organochlorine concentration we measured was 1.5 ?g g?1 ww of DDE in eggs. The highest mercury concentration was 1.8 ?g g?1...
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Gillnet catch data from the lower Yukon River, AK, collected from 1990 to 2003 in conjunction with a sonar study to estimate the abundance of migrating fish, were assembled. The full dataset contained 92,029 records with complete species and length information. A subset of data for the eight most prevalent groups of fish was selected for the estimation of net selectivity. The reduced dataset contained 89,984 records for Chinook salmon (Oncorhynchus tshawytscha), summer and fall runs of chum salmon (O. keta), coho salmon (O. kisutch), pink salmon (O. gorbuscha), humpback whitefish (Coregonus pidschian), broad whitefish (C. nasus), and various cisco (Coregonus) species. A Pearson function was used as a net selectivity...
Smith's Longspur (Calcarius pictus ) is a species of conservation concern in the U.S. and Canada, yet few studies have been conducted on their breeding grounds in the Arctic, which are expected to undergo dramatic changes due to climate change. For effective conservation, we need information on breeding distribution and abundance; thus I conducted surveys for Smith's Longspur and habitat characteristics across a broad geographic range that included twelve sites within Alaska's Brooks Range, June 2003-2009. My main objectives were to (1) locate breeding populations (2) describe habitats at local and broader geographic scales, (3) develop a predictive distribution map based on habitat characteristics, and (4) estimate...
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Harvests of Yukon Chinook salmon increased in the mid-1970s, then declined during 1998 to 2007 in response to fewer returning salmon. We examined annual growth of age-1.3 and age-1.4 Yukon Chinook salmon scales, 1965-2004, and tested the hypothesis that shifts in Chinook salmon abundance were related to annual growth at sea. Annual scale growth trends were not significantly correlated with salmon abundance indices, sea surface temperature, or climate indices, although growth during the first year at sea appeared to have been affected by the 1977 and 1989 ocean regime shifts. Chinook salmon scale growth was dependent on growth during the previous year, a factor that may have confounded detection of relationships...
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Dramatic climate changes and expansion of new biomes characterize the late Pleistocene - early Holocene of eastern Beringia. Analysis of plant macrofossils and pollen from three different sites in the Yukon Flats, central Alaska, record the past vegetation during the late Pleistocene - early Holocene (ca. 11,500-6,900 14 C yrs BP) transition. The first paper deals with plant macrofossils associated with one of the earliest post glacial beaver dams (ca. 9,300 14 C yrs BP) found in central Alaska. Vegetation reconstruction suggests a warmer than modern climate during the early Holocene. The second paper examines eight paleosols and their associated plant macrofossils and pollen within eolian deposits at two sites...
map background search result map search result map Spatial synchrony of recruitment in mountain-dwelling woodland caribou Comparative landscape genetic analysis of three Pacific salmon species from subarctic North America Caribou Populations and Ecology, Northern Muskwa-Kechika for Muskwa-Kechika Trust Fund Browse biomass removal and nutritional condition of moose Alces alces Diets of Overwintering Caribou, Rangifer tarandus, Track Decadal Changes in Arctic Tundra Vegetation Late Pleistocene - early Holocene plant macrofossils and pollen from the Yukon Flats, central Alaska Caribou, Rangifer tarandus Porcupine caribou herd management plan, 2000/2001 to 2002/2003 Status of Dall’s sheep (Ovis dalli dalli) in the Northern Richardson Mountains Moose Survey: Lower Stewart River West – White Gold area, Early-winter 2012 Ancient DNA Reveals Genetic Continuity in Mountain Woodland Caribou of the Mackenzie and Selwyn Mountains, Northwest Territories, Canada Climate, growth and population dynamics of Yukon River Chinook salmon Species richness and biodiversity conservation priorities in British Columbia, Canada Implementation Plan - a Companion Document to the Harvest Management Plan for the Porcupine Caribou Herd in Canada A versatile net selectivity model, with application to Pacific salmon and freshwater species of the Yukon River, Alaska Status of Dall’s sheep (Ovis dalli dalli) in the Northern Richardson Mountains Moose Survey: Lower Stewart River West – White Gold area, Early-winter 2012 Late Pleistocene - early Holocene plant macrofossils and pollen from the Yukon Flats, central Alaska Ancient DNA Reveals Genetic Continuity in Mountain Woodland Caribou of the Mackenzie and Selwyn Mountains, Northwest Territories, Canada Caribou Populations and Ecology, Northern Muskwa-Kechika for Muskwa-Kechika Trust Fund Browse biomass removal and nutritional condition of moose Alces alces Porcupine caribou herd management plan, 2000/2001 to 2002/2003 Implementation Plan - a Companion Document to the Harvest Management Plan for the Porcupine Caribou Herd in Canada Diets of Overwintering Caribou, Rangifer tarandus, Track Decadal Changes in Arctic Tundra Vegetation Spatial synchrony of recruitment in mountain-dwelling woodland caribou Comparative landscape genetic analysis of three Pacific salmon species from subarctic North America Caribou, Rangifer tarandus Species richness and biodiversity conservation priorities in British Columbia, Canada A versatile net selectivity model, with application to Pacific salmon and freshwater species of the Yukon River, Alaska Climate, growth and population dynamics of Yukon River Chinook salmon