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Marine-derived nutrients (MDN) delivered by spawning Pacific salmon ( Oncorhynchus spp.) contribute to the productivity of riverine ecosystems. Optimizing methods for measuring MDN assimilation in food webs will foster the development of ecologically based resource management approaches. This dissertation aims to better understand relationships among spawning salmon abundance, biochemical measures of MDN assimilation, and the fitness of stream-dwelling fishes. The goals of my first research chapter were (1) to understand the factors that influence stable isotope (δ 13 C, δ 15 N, and δ34 S) and fatty acid measures of MDN assimilation in stream and riparian biota, and (2) to examine the ability of these measures to...
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We examined how marine-derived nutrients (MDN), in the form of spawning Pacific salmon, influenced the nutritional status and delta super(15)N of stream-dwelling fishes. We sampled juvenile coho salmon (Oncorhynchus kisutch) and Dolly Varden (Salvelinus malma) during spring and fall from 11 south-central Alaskan streams that ranged widely in spawning salmon biomass (0.1-4.7 kg.m super(-2)). Growth rate (as indexed by RNA-DNA ratios), energy density, and delta super(15)N enrichment in spring-sampled fishes increased with spawner biomass, indicating the persistence of spawner effects more than 6 months after salmon spawning. Point estimates suggest that spawner effects on nutrition were substantially greater for coho...
    map background search result map search result map Toward a Diatom Biological Monitoring Index for Cook Inlet Basin, Alaska, Streams White spruce (Picea glauca) regeneration in forests disturbed by spruce beetle (Dendroctonus rufipennis) in the Anchor River watershed, Alaska Twice as easy to catch? A toxicant and a predator cue cause additive reductions in larval amphibian activity Large Woody Debris and Salmonid Habitat in the Anchor River Basin, Alaska, Following an Extensive Spruce Beetle (Dendroctonus rufipennis) Outbreak New aquatic insect (Ephemeroptera, Trichoptera, and Plecoptera) records for Alaska, U.S.A.: range extensions and a comment on under-sampled habitats Marine-derived nutrients in riverine ecosystems: Developing tools for tracking movement and assessing effects in food webs on the Kenai Peninsula, Alaska Seasonal persistence of marine-derived nutrients in south-central Alaskan salmon streams Pacific salmon (Oncorhynchus spp.) runs and consumer fitness: growth and energy storage in stream-dwelling salmonids increase with salmon spawner density White spruce regeneration following a major spruce beetle outbreak in forests on the Kenai Peninsula, Alaska Linking climate change projections for an Alaskan watershed to future coho salmon production Significant Westward Range Extension For The Limnephilid Caddisfly Phanocelia canadensis (Trichoptera): First Record From Alaska, U.S.A Future of Pacific Salmon in the Face of Environmental Change: Lessons from One of the World's Remaining Productive Salmon Regions White spruce (Picea glauca) regeneration in forests disturbed by spruce beetle (Dendroctonus rufipennis) in the Anchor River watershed, Alaska Linking climate change projections for an Alaskan watershed to future coho salmon production Seasonal persistence of marine-derived nutrients in south-central Alaskan salmon streams Pacific salmon (Oncorhynchus spp.) runs and consumer fitness: growth and energy storage in stream-dwelling salmonids increase with salmon spawner density Twice as easy to catch? A toxicant and a predator cue cause additive reductions in larval amphibian activity Marine-derived nutrients in riverine ecosystems: Developing tools for tracking movement and assessing effects in food webs on the Kenai Peninsula, Alaska White spruce regeneration following a major spruce beetle outbreak in forests on the Kenai Peninsula, Alaska Future of Pacific Salmon in the Face of Environmental Change: Lessons from One of the World's Remaining Productive Salmon Regions Large Woody Debris and Salmonid Habitat in the Anchor River Basin, Alaska, Following an Extensive Spruce Beetle (Dendroctonus rufipennis) Outbreak Significant Westward Range Extension For The Limnephilid Caddisfly Phanocelia canadensis (Trichoptera): First Record From Alaska, U.S.A Toward a Diatom Biological Monitoring Index for Cook Inlet Basin, Alaska, Streams New aquatic insect (Ephemeroptera, Trichoptera, and Plecoptera) records for Alaska, U.S.A.: range extensions and a comment on under-sampled habitats