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Invasive species are a concern worldwide as they can displace native species, reduce biodiversity, and disrupt ecological processes. European bird cherry (Prunus padus) (EBC) is an invasive ornamental tree that is rapidly spreading and possibly displacing native trees along streams in parts of urban Alaska. The objectives of this study were to: 1) map the current distribution of EBC along two Anchorage streams, Campbell and Chester creeks, and 2) determine the effects of EBC on selected ecological processes linked to stream salmon food webs. Data from the 2009 and 2010 field seasons showed: EBC was widely distributed along Campbell and Chester creeks; EBC leaf litter in streams broke down rapidly and supported similar...
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Individual point estimates of stream density by juvenile salmonid species in two small tributaries to the Salmon River, Lake Ontario, New York were recorded. Enumeration of salmonid species was observed using a backpack electrofisher in order to identify fish species. Stream density estimates were calculated using stream width measurements taken at equally spaced transects. Comparisons of species densities between the two streams were analyzed to infer competition or segregation.
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Pulsed subsidy events create ephemeral fluxes of hyper-abundant resources that can shape annual patterns of consumption and growth for recipient consumers. However, environmental conditions strongly affect local resource availability for much of the year, and can heavily impact consumer foraging and growth patterns prior to pulsed subsidy events. Thus, a consumer’s capacity to exploit pulse subsidy resources may be influenced by antecedent environmental conditions, but this has rarely been shown in nature and is unknown in aquatic ecosystems. We sampled fish at a high frequency (daily - weekly measurements) to examine the importance of hydrologic variation and a salmon pulse subsidy on the foraging patterns of two...
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...
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Report is divided into two sections. In Section I, an introductory overview of the Northern Cook Inlet Management Area is presented, including: a general geographic and organizational description of the management area; an inventory of the available fishery resources; an overview of the Alaska Board of Fisheries processes; existing management plans; a historical perspective of recreational angler effort, catch and harvest; and an approximation of the economic value of the recreational fisheries. A general description of research, management and educational activities, ongoing access programs, and a summary of the current major biological and social issues in the management area are also presented. In Section II,...
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Final distribution and status map for the aquatic fine filter Coho Salmon. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. The BLM should be cited as the data source in any products derived from these data.
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The Cook Inlet Planning Area includes and abuts productive commercial, subsistence, and sport fishing grounds. Outer continental shelf minerals exploration, development and production activities could affect the productivity of these fisheries, the quality of recreation opportunities, and the demand for tourism-related services. The marine sport fisheries of lower and central Cook Inlet are the focus of a large recreation based economic sector that provides non-monetary benefits to participants and monetary benefits to tourism-related businesses. This study and a companion study, Lee et al. [1999b], develop a predictive model of participation rate changes that can be linked to a regional inputoutput model to estimate...
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The geographic distribution of stream reaches with potential to support high quality habitat for salmonids has bearing on the actual status of habitats and populations over broad spatial extents. As part of the Coastal Landscape Analysis and Modeling Study (CLAMS), we examined how salmon-habitat potential was distributed relative to current and future (+100 years) landscape characteristics in the Coastal Province of Oregon, USA. The intrinsic potential to provide high-quality rearing habitat was modeled for juvenile coho salmon (Oncorhynchus kisutch) and juvenile steelhead (O. mykiss) based on stream flow, valley constraint, and stream gradient. See Supplemental Information for additional detail. BLM (Bureau of...
Report is divided into two sections. In Section I, an introductory overview of the Northern Cook Inlet Management Area is presented, including: a general geographic and organizational description of the management area; an inventory of the available fishery resources; an overview of the Alaska Board of Fisheries processes; existing management plans; a historical perspective of recreational angler effort, catch and harvest; and an approximation of the economic value of the recreational fisheries. A general description of research, management and educational activities, ongoing access programs, and a summary of the current major biological and social issues in the management area are also presented. In Section II,...
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A pilot study was conducted to evaluate the use of PIT tags and underwater antennas to measure juvenile salmon growth rates and site fidelity. Juvenile coho (Oncorhynchus kisutch) and Chinook salmon (Oncorhynchus tshawytsha) growth rates and site fidelity were compared between two streams within the Susitna River drainage in Southcentral Alaska. The two study streams were selected to represent a low-sloped wetland stream which is common on the west side of the drainage and a moderate sloped upland stream that drains the Talkeetna mountains which is common on the east side of the drainage. Comparisons of growth rates and site fidelity within these two streams were used to test for the differences in the habitat quality...
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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...
Many fisheries for Pacific salmon Oncorhynchus spp. are actively managed to meet escapement goal objectives. In fisheries where the demand for surplus production is high, an extensive assessment program is needed to achieve the opposing objectives of allowing adequate escapement and fully exploiting the available surplus. Knowledge of abundance is a critical element of such assessment programs. Abundance estimation using mark—recapture experiments in combination with telemetry has become common in recent years, particularly within Alaskan river systems. Fish are typically captured and marked in the lower river while migrating in aggregations of individuals from multiple populations. Recapture data are obtained using...


map background search result map search result map WOPR Intrinsic Potential Coho Salmon Stream Reaches Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Marine-derived nutrients in riverine ecosystems: Developing tools for tracking movement and assessing effects in food webs on the Kenai Peninsula, Alaska Area Management Report for the Recreational Fisheries of Northern Cook Inlet, 2001 and 2002 Comparison of Site Fidelity and Growth Rates of Juvenile Salmon between two Stream Types - A Pilot Study An Economic Assessment of the Sport Fisheries for Halibut, and Chinook and Coho Salmon in Lower and Central Cook Inlet Participation decisions, angler welfare, and the regional economic impact of sportfishing Linking climate change projections for an Alaskan watershed to future coho salmon production BLM REA SNK 2010 AS Fish Status Coho Salmon Stream hydrology and a pulse subsidy shape patterns of fish foraging Juvenile Salmonid Densities in Orwell Brook and Trout Brook, New York 2014-2023 Stream hydrology and a pulse subsidy shape patterns of fish foraging Juvenile Salmonid Densities in Orwell Brook and Trout Brook, New York 2014-2023 Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Linking climate change projections for an Alaskan watershed to future coho salmon production Marine-derived nutrients in riverine ecosystems: Developing tools for tracking movement and assessing effects in food webs on the Kenai Peninsula, Alaska An Economic Assessment of the Sport Fisheries for Halibut, and Chinook and Coho Salmon in Lower and Central Cook Inlet Participation decisions, angler welfare, and the regional economic impact of sportfishing WOPR Intrinsic Potential Coho Salmon Stream Reaches Area Management Report for the Recreational Fisheries of Northern Cook Inlet, 2001 and 2002 BLM REA SNK 2010 AS Fish Status Coho Salmon