Defining marine habitat of juvenile Chinook salmon, <Emphasis Type="Italic">Oncorhynchus tshawytscha</Emphasis>, and coho salmon, <Emphasis Type="Italic">O. kisutch</Emphasis>, in the northern California Current System |
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Authors: | Suzan S Pool Douglas C Reese Richard D Brodeur |
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Institution: | (1) Cooperative Institute for Marine Resources Studies, Oregon State University, 2030 Marine Science Drive, Newport, OR 97365, USA;(2) Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331, USA;(3) Northwest Fisheries Science Center, National Oceanic and Atmospheric Administration, 2030 SE Marine Science Drive, Newport, OR 97365, USA |
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Abstract: | We investigated habitat use by juvenile Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) to identify environmental characteristics that may define their optimal marine habitat. We utilized physical and biological
data from four cruises in the northern California Current system from Newport, Oregon, to Crescent City, California, in June
and August 2000 and 2002. A non-parametric statistical method was used to analyze and select environmental parameters that
best defined ocean habitat for each species. Regression trees were generated for all cruises combined to select the most important
habitat variables. Chlorophyll a concentration best defined habitat of yearling Chinook salmon, while decapod larvae, salinity, and neuston biovolume defined
habitat of yearling coho salmon. Using criteria from the regression tree analysis, GIS maps were produced to show that the
habitat of yearling Chinook salmon was widespread over the continental shelf and the habitat of yearling coho salmon was variable
and mainly north of Cape Blanco. |
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