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We documented the occurrence of eight rare passerines in central Alaska. Our observations of the Yellow-bellied Flycatcher, Red-breasted Nuthatch, Arctic Warbler, Golden-crowned Kinglet, Tennessee Warbler, Palm Warbler, Mourning Warbler, and Clay-colored Sparrow provided new distributional information on the occurrence of these species in central Alaska. Mist netting [not a spray, just a light net] was essential to documenting the geographic distribution of these species because mist-net captures represented the only occurrence of several species. Additionally, many of these records could not have been identified to subspecies without collecting individuals as voucher specimens that could be verified by other scientists.
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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...
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 Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia 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 Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008 Updated geographic distribution of eight passerine species in central Alaska Concluding Remarks: what do we Need to Know about Bats in Northwestern North America? Adult Salmon Runs and Streamflow Data at a Resistance Board Weir on Beaver Creek, Alaska, 1998-2000 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 The ecology of snowshoe hares in northern boreal forests 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 TREE SWALLOWS TRADE OFF IMMUNE FUNCTION AND REPRODUCTIVE EFFORT DIFFERENTLY ACROSS THEIR RANGE Adult Salmon Runs and Streamflow Data at a Resistance Board Weir on Beaver Creek, Alaska, 1998-2000 Physical barrier to reduce WP mortalities of foraging waterfowl George River Salmon Studies, 2006 Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008 Updated geographic distribution of eight passerine species in central Alaska Distribution and abundance of landbirds in the Tanana Valley State Forest, Alaska 2002-2003 The ecology of snowshoe hares in northern boreal forests 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 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) 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