Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7428
Title: Influence of ocean ecosystem variation on trophic interactions and survival of juvenile coho and Chinook salmon
Author: James Losee, Jessica A. Miller, William T. Peterson, David J. Teel, K. C. Jacobson
Publication Year: 2014
Journal: Canadian Journal of Fisheries and Aquatic Sciences
Volume: 71
Pages: 1747-1757
Keywords: parasites,zooplankton

The community of trophically transmitted marine parasites of juvenile coho (Oncorhynchus kisutch) and Chinook (O. 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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Notes: Pagination not final as of 1 Oct 2014
Theme: Habitats to Support Sustainable Fisheries and Recovered Populations
Foci: Characterize relationships between habitat and ecosystem processes, climate variation, and the viability of organisms.