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Influence of ocean ecosystem variation on trophic interactions and survival of juvenile coho and Chinook salmon

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https://ir.library.oregonstate.edu/concern/articles/td96k439c

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  • The community of trophically transmitted marine parasites of juvenile coho (Oncorhynchus kisutch) and Chinook (Oncorhynchus tshawytscha) salmon across 8 years (2002–2009) was related to indices of physical and biological ocean conditions and adult returns. When the biomass of lipid-poor, southern origin copepods in the coastal ocean was high during juvenile salmon outmigration from fresh water (April–June), yearling coho and Chinook salmon harbored a different trophically transmitted parasite fauna and exhibited lower survival compared with years when the southern copepod biomass was low. As copepods are key intermediate hosts in many marine parasite life cycles, these results support a trophic linkage between the copepod community and salmon prey. Interannual variation in the parasite community was correlated with survival of coho salmon (r = −0.67) measured 1 year later and adult returns of Upper Columbia River summer and fall Chinook salmon (r = −0.94) 3 years from the time of ocean entry.
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  • Losee, J. P., Miller, J. A., Peterson, W. T., Teel, D. J., & Jacobson, K. C. (2014). Influence of ocean ecosystem variation on trophic interactions and survival of juvenile coho and Chinook salmon. Canadian Journal of Fisheries and Aquatic Sciences, 71(11), 1747-1757. doi:10.1139/cjfas-2014-0043
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  • 71
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  • 11
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  • Funding for this study was provided by the Bonneville Power Administration (contract No. 00053808), Oregon State University’s Cooperative Institute for Marine Resources Studies, the National Oceanic and Atmospheric Administration (NOAA), Mamie Markham Research Award, and the Neil Armantrout Scholarship from Oregon State University.
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