Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Pacific salmon"”.
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Group size affects predation risk and foraging success in Pacific salmon at sea
… a multi-decadal data set from sampling of Pacific salmon (Oncorhynchus spp.) in the ocean. Across all species, individuals in larger groups had lower risk of predator attack, inferred from wounds on surviving fish. Within groups, outliers (smaller and larger fish) were disproportionately …
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An Ecological Comparison Between Resource Subsidies: Pacific Lamprey (<i>Entosphenus tridentatus</i>) and Pacific Salmon (<i>Oncorhynchus</i> spp.)
<p>Historically, oligotrophic Pacific Northwest (PNW) streams received annual returns of spawning anadromous fish that provided resource subsidies in the form of marine-derived nutrients (MDN), thus driving stream food web productivity. To date, many studies in the PNW have focused on Pacific …
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Lepeophtheirus salmonis, parasitizing three species of pacific salmon (Oncorhynchus spp.): host variations in load, morphology, fecundity, and genetics of the salmon louse
… study is to determine biological parameters of salmon lice (Lepeophtheirus salmonis) as they parasitize different species of Pacific Ocean salmonids off the north Pacific coast of Washington State. Parasite load counts of L. salmonis were made and individuals were collected from salmonids in …
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The Contribution of Spawning Pacific-salmon to Nitrogen Fertility and Vegetation Nutrition during Riparian Primary Succession on an Expansive Floodplain of a Large River
… RU), received large annual N-subsidies from salmon and we sought to determine how salmon-N contributed to fertility during succession. </p> <p>We constructed a vegetation chronosequence model and made N-fertility measurements within replicate succession stages before, during and after salmon …
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The Contribution of Spawning Pacific-salmon to Nitrogen Fertility and Vegetation Nutrition during Riparian Primary Succession on an Expansive Floodplain of a Large River
… RU), received large annual N-subsidies from salmon and we sought to determine how salmon-N contributed to fertility during succession. </p> <p>We constructed a vegetation chronosequence model and made N-fertility measurements within replicate succession stages before, during and after salmon …
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Recovery of Oregon Coast Coho Salmon (Onchorhynchus kitsutch) through Restoration of Freshwater Habitats
<p>Pacific salmon populations are significantly lower than historic levels on the Western Coast of the United States. The Oregon Coast coho salmon Evolutionary Significant Unit (ESU) was listed as threatened under the Endangered Species Act in February 2008. The total number of adult coho salmon …
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Monitoring the influx of marine derived Nitrogen and characterizing soil food webs of riparian zones of the Elwha River Watershed, WA, USA.
… ecosystem processes. Two sources of nitrogen to Pacific Northwest riparian areas are marine derived nitrogen (MDN) via anadromous pacific salmon and symbiotic nitrogen fixation via Alnus rubra. The recent removal of two large dams on the Elwha River, WA, opened up ~60 km of previously …
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An examination of differential survival in downstream migrating coho salmon smolts
The smolt stage of the life history of Pacific salmon (Onchorhynchus sp.) has received little attention relative to the other life history stages. I examined mortality during the downstream migration of coho salmon (0. kisutch) smolts by trapping and marking smolts high in the watershed and …
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PREDICTING CONTAMINANT TRANSFER FOLLOWING RE-ESTABLISHED CONNECTIVITY IN THE BOARDMAN RIVER
… deposition in spawning streams with introduced Pacific salmon representing a greater risk than native suckers.</p>
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Influence of Early Life Stage Hatchery Enhancement Practices on Maternal Reproductive Investment in Coho Salmon (Oncorhynchus kisutch)
… programs are a central component of Canadian Pacific salmon management, supporting commercial, recreational, cultural, and conservation objectives. However, the consequences of captive rearing environments for the reproductive phenotype of returning adults remain poorly understood. In …
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The Ecology of Parafluvial Ponds on a Salmon River
… Kwethluk River, I observed thousands of juvenile salmon apparently trapped by surface disconnection of the ponds from the river. I was interested in whether the salmon could survive until flooding reconnected the ponds to the river. I sampled ponds along the river corridor to describe habitat …
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The Ecology of Parafluvial Ponds on a Salmon River
… Kwethluk River, I observed thousands of juvenile salmon apparently trapped by surface disconnection of the ponds from the river. I was interested in whether the salmon could survive until flooding reconnected the ponds to the river. I sampled ponds along the river corridor to describe habitat …
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Ecology of Manayunkia speciosa
… can cause substantial mortalities in juvenile Pacific salmon (<italic>Oncorhynchus</italic> spp.) has sparked an interest in the ecology of this polychaete. Salmon of the Klamath River basin, California-Oregon, have experienced particularly high mortalities due to the parasites and management …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
Anadromous Pacific salmon (Oncorhynchus spp.) populations are strongly regulated by climatic regimes and human activities across numerous spatial and temporal scales. The carcasses of adults returning to spawn provide important marine derived nutrients (MDN) to freshwater and terrestrial ecosystems …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
Anadromous Pacific salmon (Oncorhynchus spp.) populations are strongly regulated by climatic regimes and human activities across numerous spatial and temporal scales. The carcasses of adults returning to spawn provide important marine derived nutrients (MDN) to freshwater and terrestrial ecosystems …
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An Intraseason Forecasting System for Commercial Marine Fisheries
… estimation technique which is commonly used by Pacific salmon harvest managers is evaluated for applicability to a variety of commercial finfish and crustacean fisheries. The estimation technique is known as the average timing or the average performance model. The method is not easily related to …
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THE LIFE HISTORY AND ECOLOGY OF RIVERINE SOCKEYE SALMON (ONCORHYNCHUS NERKA) IN A LARGE FLOODPLAIN RIVER
The productivity and life history diversity of salmonids is linked to the complexity of habitat in large floodplain rivers. Dynamic floodplain processes are driven by flow, sediment transport, cut and fill alluviation, woody plant succession, and ecosystem engineers, notably beavers, that create …
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THE LIFE HISTORY AND ECOLOGY OF RIVERINE SOCKEYE SALMON (ONCORHYNCHUS NERKA) IN A LARGE FLOODPLAIN RIVER
The productivity and life history diversity of salmonids is linked to the complexity of habitat in large floodplain rivers. Dynamic floodplain processes are driven by flow, sediment transport, cut and fill alluviation, woody plant succession, and ecosystem engineers, notably beavers, that create …
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Comparison of polychlorinated biphenyl profiles in rat, fish and human tissues; the effects of consuming Great Lakes fish
… lake trout compared to walleye, whitefish, and Pacific salmon. The profiles of individual congeners differed between the species, with whitefish containing tri- and tetrachlorobiphenyl congeners in the highest concentrations and lake trout and siscowet lake trout containing hexa- and …
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