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• W2094351027 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 452:237-252 (2012) - DOI: https://doi.org/10.3354/meps09620 When is bigger better? Early marine residence of middle and upper Columbia River spring Chinook salmon Londi M. Tomaro1*, David J. Teel2, William T. Peterson3, Jessica A. Miller1 1Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Department of Fisheries and Wildlife, Oregon State University, 2030 SE Marine Science Drive, Newport, Oregon 97365, USA 2NOAA Fisheries, Northwest Fisheries Science Center, Manchester, Washington 98353, USA 3NOAA Fisheries, Northwest Fisheries Science Center, Newport, Oregon 97365, USA *Email: londi.tomaro@lifetime.oregonstate.edu ABSTRACT: Early ocean residence is considered a critical period for juvenile salmon although specific survival mechanisms are often unidentified and may vary by species or life stage. Columbia River spring-run Chinook salmon Oncorhynchus tshawytscha abundance has declined dramatically since the early 1900s. To elucidate mechanisms of early marine survival, we tested the ‘bigger-is-better’ and ‘stage-duration’ aspects of the ‘growth-mortality’ hypothesis, which posits that size and growth rate are important for future abundance. We tested the ‘match-mismatch’ hypothesis to determine whether early marine growth was related to indices related to regional productivity, including spring transition timing and copepod community composition. We generated estimates of individual size at ocean entry and capture, marine growth rate, early marine migration rate, and emigration timing using data from ocean surveys, genetic stock-assignment, and otolith analyses of juveniles collected across 8 yr between 1998 and 2008. Size at capture and marine growth rate after ~30 d marine residence were positively related to future adult returns, whereas size at marine entry was not. Growth rate was not significantly related to indices of secondary production, but size at capture was significantly greater when lipid-rich copepods dominated. Although future adult abundance was not related to emigration timing, juveniles migrated more slowly when copepod biomass was high, perhaps responding to foraging conditions. Overall, processes during early ocean residence appear to be more important for cohort size establishment than those at marine entry. Approaches that combine genetic and otolith analyses have great potential to provide information on stock-specific variation in survival mechanisms. KEY WORDS: Survival mechanisms · Juvenile salmon · Columbia River · Ocean residence · Otolith back-calculation Full text in pdf format PreviousNextCite this article as: Tomaro LM, Teel DJ, Peterson WT, Miller JA (2012) When is bigger better? Early marine residence of middle and upper Columbia River spring Chinook salmon. Mar Ecol Prog Ser 452:237-252. https://doi.org/10.3354/meps09620 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 452. Online publication date: April 25, 2012 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2012 Inter-Research." @default.
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• W2094351027 date "2012-04-25" @default.
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• W2094351027 title "When is bigger better? Early marine residence of middle and upper Columbia River spring Chinook salmon" @default.
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• W2094351027 doi "https://doi.org/10.3354/meps09620" @default.
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