Seasonal,Diel, and Landscape Effects on Resource Partitioning between Juvenile Chinook Salmon (<Emphasis Type="Italic">Oncorhynchus tshawytscha</Emphasis>) and Threespine Stickleback (<Emphasis Type="Italic">Gasterosteus aculeatus</Emphasis>) in the Columbia River Estuary |
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| Authors: | Sarah Anne Spilseth Charles A Simenstad |
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| Institution: | (1) School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA |
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| Abstract: | The objective of this study was to determine if exploitative competition between between juvenile Chinook salmon (Oncorhynchus tshawytscha) and threespine stickleback (Gasterosteus aculeatus) reduces the foraging opportunity of juvenile Chinook salmon in tidal channels of the Columbia River estuary. We sampled
Chinook salmon and stickleback diets monthly and over a diel cycle in spatially distinct emergent marshes of the Columbia
River estuary. Diets of the two fish species did not differ among marsh systems, but both fish species exhibited diel and
seasonal differences in diet composition. Diet overlap between the two fish species was greatest in March and June. Exploitative
competition was unlikely based on a comparison between consumption rates and estimated invertebrate production. |
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