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During the period 1970-2000, substantial efforts were made to document the distribution and number of Trumpeter Swans (Cygnus buccinator) in western Canada. Breeding surveys have expanded from covering less than 20,000 km2 in the Grande Prairie region of Alberta to cover 780,000 km2, perhaps one-third of northwestern Canada. Aerial surveys involving total or partial counts have been used in most areas. Since 1995, sample-based surveys have been used in Yukon Territory and extreme northern British Columbia. Between 1970 and 2000, breeding surveys have documented a dramatic increase in both breeding distribution and numbers in western Canada (100 to more than 3,700). Winter surveys in British Columbia have corroborated...
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he George River is a tributary of the Kuskokwim River, and produces chinook salmon Oncorhynchus tshawytscha, chum salmon O. keta, and coho salmon O. kisutch that contribute to intensive subsistence and commercial salmon fisheries downstream of its confluence. The George River weir is one of several projects operated in the Kuskokwim area that form an integrated geographic array of escapement monitoring projects. Collectively, and in accordance with the State of Alaska Sustainable Fishery Policy (5 AAC 39.222), this array of projects is a tool to assure appropriate geographic and temporal distribution of spawning salmon, and provide a means to assess trends in escapement that should be monitored and considered in...
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Increased light reaching streams as a result of riparian vegetation management is often thought to be responsible for enhanced algal productivity. However, concomitant changes in nutrients and other physical processes confound that interpretation. We manipulated light in two separate experiments to test the role of light as a controlling factor for periphyton productivity and biomass, and to observe invertebrate responses in small streams in central British Columbia, Canada. We did this by adding artificial light to reaches of three forested streams, and in a second experiment we used shadecloth to cover reaches of two streams flowing through clearcuts. Periphyton growth, productivity and composition, and macroinvertebrate...
Population dynamics of Canada lynx (Lynx canadensis) have been of interest to ecologists for nearly sixty years. Two competing hypotheses concerning lynx population dynamics and large-scale spatial synchrony are currently debated. The first suggests that dispersal is substantial among lynx populations, and the second proposes that lynx at the periphery of their range exist in small, isolated patches that maintain cycle synchrony via correlation with extrinsic environmental factors. Resolving the nature of lynx population dynamics and dispersal is important both to ecological theory and to the conservation of threatened lynx populations: the lack of knowledge about connectivity between populations at the southern...
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For 40 years, the Biological Survey of Canada (BSC) has encouraged and organised studies of the arthropod fauna of Canada, through the wide involvement of the scientific community and the leadership of an expert steering committee. The benefits of the BSC to science include the completion of major cooperative projects to acquire and synthesise knowledge (documenting faunas in the Yukon, Canadian grasslands, and other significant regions and habitats), the assembly and organisation of information and specimens, and improved communication among entomologists. Its efforts have led to valuable monographs, scientific briefs, newsletters, and other products summarised here, including documents that are also useful to...
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The St. Elias region of North America occupies portions of British Columbia, Alaska, and Yukon and consists of a contiguous network of protected areas. Available information on avian and mammalian diversity in each of the region's five major protected areas (Kluane National Park, Wrangell-St. Elias National Park and Preserve, Glacier Bay National Park and Preserve, Tatshenshini-Alsek Provincial Park, and Tetlin National Wildlife Refuge) was integrated to create a species checklist as part of an ongoing effort to create a region-wide ecological database for research and management purposes. Based on the tabulated data, the five protected areas combine to protect a total of 178 species of breeding birds and 51 species...
The apparent lack of external differences between sexes, coupled with their unusual reproductive habits, make Burbot (Lota Iota Linnaeus 1758) a unique model for which to investigate life history and reproductive ecology traits. Burbot, a top level predator, are the only freshwater representative of the cod family (Gadidae). Despite being one of the most widely distributed freshwater fish species in the world, occurring throughout boreal and tundra ecosystems of the Northern Hemisphere, very little is known about their ecology. Theory suggests that life history traits develop as adaptive strategies for an organism to cope with environmental conditions. Reproduction is a key life history component, and requires tradeoffs...
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White phosphorus (WP) has been identified as the cause of mortality to certain species of waterfowl at Eagle River Flats, a tidal marsh in Alaska, used as an ordnance impact area by the U.S. Army. A blend of calcium bentonite/organo clays, gravel, and binding polymers was tested for effectiveness as a barrier to reduce duck foraging and mortality. Following the application of the barrier to one of two contaminated ponds, we observed greater duck foraging and higher mortality in the untreated pond and no mortality in the treated pond after a year of tidal inundations and ice effects. Emergent vegetation recovered within a year of treatment. WP levels in the barrier were less than the method limit of detection, indicating...
map background search result map search result map Physical barrier to reduce WP mortalities of foraging waterfowl TREE SWALLOWS TRADE OFF IMMUNE FUNCTION AND REPRODUCTIVE EFFORT DIFFERENTLY ACROSS THEIR RANGE A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon George River Salmon Studies, 2006 Experimental increases and reductions of light to streams: effects on periphyton and macroinvertebrate assemblages in a coniferous forest landscape The Ecological Future of the North American Bison: Conceiving Long-Term, Large-Scale Conservation of Wildlife Birds and Mammals of the St. Elias Mountain Parks: Checklist Evidence for a Biogeographic Convergence Zone Concluding Remarks: what do we Need to Know about Bats in Northwestern North America? Trumpeter Swan Numbers and Distribution in Western Canada, 1970-2000 Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) Kuskokwim River salmon stock status and Kuskokwim area fisheries, 2009: a Report to the Alaska Board of Fisheries The Application of Microsatellites for Stock Identification of Yukon River Chinook Salmon Summer diet of caribou in southern Yukon 5000 years BP to present Distribution and abundance of landbirds in the Tanana Valley State Forest, Alaska 2002-2003 Benefits and principles of the Biological Survey of Canada: a model for scientific cooperation TREE SWALLOWS TRADE OFF IMMUNE FUNCTION AND REPRODUCTIVE EFFORT DIFFERENTLY ACROSS THEIR RANGE Physical barrier to reduce WP mortalities of foraging waterfowl George River Salmon Studies, 2006 Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Distribution and abundance of landbirds in the Tanana Valley State Forest, Alaska 2002-2003 Birds and Mammals of the St. Elias Mountain Parks: Checklist Evidence for a Biogeographic Convergence Zone Kuskokwim River salmon stock status and Kuskokwim area fisheries, 2009: a Report to the Alaska Board of Fisheries Summer diet of caribou in southern Yukon 5000 years BP to present A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) The Application of Microsatellites for Stock Identification of Yukon River Chinook Salmon 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? Trumpeter Swan Numbers and Distribution in Western Canada, 1970-2000 Benefits and principles of the Biological Survey of Canada: a model for scientific cooperation