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An emerging application of phylogeography in avian conservation is to use the genetic structure revealed by the DNA markers as a "genetic tag" to track migratory birds throughout their annual cycle. I used inferences from genetic analyses to show how the Pleistocene glaciations have moulded the evolutionary history of a migratory bird, the yellow warbler ( Dendroica petechia ). Based on mtDNA genotypes from 696 breeding birds, I found two monophyletic clades: a highly migratory clade consisting of eastern and western lineages and a less migratory clade consisting of southern and resident lineages. This result is not consistent with the current taxonomy of the species that is primarily based on plumage variation:...
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We isolated luminous bacteria from drying chum salmon, Oncorhynchus keta, reported by Alaska native fishermen to be 'glowing in the dark.' The salmon were harvested for subsistence use from the Yukon River, Alaska. We identified our luminous bacterial isolates as Photobacterium phosphoreum based on nutritional versatility, and 16S rDNA and luxA gene sequences. P. phosphoreum has previously only been isolated from the marine environment. We tested whether our strains, isolated from fish harvested in freshwater, represent cold-adapted, freshwater-tolerant strains of P. phosphoreum. We also analyzed lux operon composition and organization, and examined the 5' promoter region of the lux operon for shared genes and regulatory...
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Classically, testosterone (T) was considered the principal regulator of aggression. However, recent studies in birds have found aggression and T uncoupled during the non-breeding season. Circulating testosterone comes with costs such as immunosuppression and energy expenditure. Instead, the pro-hormone, dehydroepiandrosterone (DHEA), is circulated and activated within the brain via conversion into oestradiol (E 2 ), avoiding the costs associated with T. At present the site of DHEA synthesis is unknown. My thesis investigated the existence of an analogous pathway in non-breeding red squirrels (Tamiasciurus hudsonicus ) with two studies: (a) a field study investigating the effects of E2 on aggression and (b) a laboratory...
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Western Canada is currently experiencing an epidemic infestation of mountain pine beetle (Dendroctonus ponderosae Hopkins). In British Columbia, the infestation extends over more than 13 million ha and has resulted in a wide-range of social, economic, and ecological impacts. In this study, we compile the known environmental drivers of the infestation and assess these drivers against the actual outcomes of the infestation to date. To support our investigation, we defined the population at risk to mountain pine beetle attack as the spatial extent of pine in British Columbia (approximately 525,329 km2) and used a range of driver variables known to influence the location and success of beetle infestations (i.e., proportion...
AbstractBering Ciscoes Coregonus laurettae are anadromous salmonids with known spawning populations only in the Yukon, Kuskokwim, and Susitna rivers in Alaska. A commercial fishery for the species was recently initiated at the mouth of the Yukon River, inspiring a series of research projects to enhance our understanding of the exploited population. This study was designed to delineate the geographic spawning distribution of Bering Ciscoes in the Yukon River. One hundred radio transmitters per year in 2012 and 2013 were deployed in prespawning Bering Ciscoes at a site located 1,176 km upstream from the sea. A total of 160 fish survived fish wheel capture and tagging, avoided harvest and predation after tagging, and...
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Hatcheries play an important role in the enhancement of Pacific salmon (genus Oncorhynchus) as a resource, but genetic and phenotypic divergence trom wild populations may occur as a result of founder effects, genetic drift and/or domestication. In this study, agonistic behavior, ability to establish dominance, and morphology were compared among juveniles of chinook salmon (Oncorhynchus tshawytscha) that have experienced five generations of hatchery ranching culture, juveniles derived trom the wild founding stock, and second generation hybrids of the two lines. The parent generation of all lines was cultured in the same hatchery environment as the juveniles tested. Behavioral observations were conducted in replicate...


map background search result map search result map The hormonal regulation of non-breeding territorial aggression in North American red squirrels (Tamiasciurus hudsonicus) Detection efficiency and habitat use to inform inventory and monitoring efforts: juvenile coho salmon in the Knik River basin, Alaska Winter Habitat Associations of Juvenile Salmon in the Susitna and Talkeetna Rivers. Prepared For the: National Marine Fisheries Service Climate variability and spruce beetle (Dendroctonus rufipennis) outbreaks in south-central and southwest Alaska Climate and intraspecific competition control the growth and life history of juvenile sockeye salmon (Oncorhynchus nerka) in Iliamna Lake, Alaska Southern Lakes Terrestrial Environment Baseline Studies - 2010 Amphibian Surveys. Prepared for: Yukon Energy Corporation and AECOM Canada Ltd Isolation and characterization of photobacterium phosphoreum from migrating Alaskan salmon Variation of agonistic behavior and morphology among juvenile chinook salmon (Oncorhynchus tshawytscha) of hatchery, wild, and hybrid origin under common rearing conditions A Provincial and Regional Assessment of the Mountain Pine Beetle Epidemic in British Columbia: 1999-2008 Climate and intraspecific competition control the growth and life history of juvenile sockeye salmon (Oncorhynchus nerka) in Iliamna Lake, Alaska Detection efficiency and habitat use to inform inventory and monitoring efforts: juvenile coho salmon in the Knik River basin, Alaska The hormonal regulation of non-breeding territorial aggression in North American red squirrels (Tamiasciurus hudsonicus) Southern Lakes Terrestrial Environment Baseline Studies - 2010 Amphibian Surveys. Prepared for: Yukon Energy Corporation and AECOM Canada Ltd Winter Habitat Associations of Juvenile Salmon in the Susitna and Talkeetna Rivers. Prepared For the: National Marine Fisheries Service Climate variability and spruce beetle (Dendroctonus rufipennis) outbreaks in south-central and southwest Alaska Variation of agonistic behavior and morphology among juvenile chinook salmon (Oncorhynchus tshawytscha) of hatchery, wild, and hybrid origin under common rearing conditions A Provincial and Regional Assessment of the Mountain Pine Beetle Epidemic in British Columbia: 1999-2008 Isolation and characterization of photobacterium phosphoreum from migrating Alaskan salmon