Disentangling individual- and population-scale processes within a latitudinal size-gradient in Sockeye Salmon

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dc.contributor.authorFreshwater, Cameron
dc.contributor.authorTrudel, Marc
dc.contributor.authorBeacham, Terry
dc.contributor.authorGodbout, Lyse
dc.contributor.authorNeville, Chrys-Ellen
dc.contributor.authorTucker, Strahan
dc.contributor.authorJuanes, Francis
dc.date.accessioned2021-07-06T22:31:10Z
dc.date.available2021-07-06T22:31:10Z
dc.date.copyright2015en_US
dc.date.issued2015
dc.description.abstractWe examined how individual processes contribute to a latitudinal gradient in body size within populations of migrating juvenile Sockeye Salmon (Oncorhynchus nerka) while simultaneously testing for size-selective mortality, a potentially confounding population scale process. Using otolith microstructure techniques and structural equation modeling, we determined that ocean entry size and phenology had strong, direct effects on size at capture. Population identity and freshwater age also had strong indirect effects, moderated by size at entry. Conversely, marine growth rates immediately after entry or before capture were relatively weak predictors of size during migration. We next tested for shifts in size distribution indicative of selective mortality, but detected no evidence of smaller individuals experiencing lower survival during early marine migrations. These results indicate that the migratory distributions of juvenile Sockeye Salmon are influenced by body size and that this variation is predominantly driven by traits present prior to freshwater outmigration, rather than marine growth or differential survival. We suggest integrating individual variation in migratory characteristics with the effects of environmental conditions experienced en route to provide an improved understanding of migratory species. en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe thank Tyler Zubkowski, John Morris, Mary Thiess, 484 Yeongha Jung, and the crew of the CCGS W.E. Ricker and F/V Viking Storm for assisting with the collection of O. nerka post-smolts. We also thank Skip McKinnell for insightful comments that improved previous versions of this manuscript. Finally, we are grateful for the insightful comments of two anonymous reviewers. Funding was provided by a University of Victoria Graduate Fellowship, an Arne H. Lane Graduate Fellowship, the Liber Ero Foundation, CFI and BCKDF infrastructure grants (30766), NSERC Discovery Grant (418670-2013), Fisheries and Oceans Canada, and the Bonneville Power Administration (2003-009-00-29753). All applicable national guidelines for the care and use of animals were followed.en_US
dc.identifier.citationFreshwater, C., Trudel, M., Beacham, T., Godbout, L., Neville, C.-E., Tucker, S., & Juanes, F. (2015). Disentangling individual- and population-scale processes within a latitudinal size-gradient in Sockeye Salmon. Canadian Journal of Fisheries and Aquatic Sciences, 73. https://doi.org/10.1139/cjfas-2015-0344en_US
dc.identifier.urihttps://doi.org/10.1139/cjfas-2015-0344
dc.identifier.urihttp://hdl.handle.net/1828/13091
dc.language.isoenen_US
dc.publisherCanadian Journal of Fisheries and Aquatic Sciencesen_US
dc.subjectbody size
dc.subjectmigration
dc.subjectstructural equation modelling
dc.subject.departmentDepartment of Biology
dc.titleDisentangling individual- and population-scale processes within a latitudinal size-gradient in Sockeye Salmonen_US
dc.typePreprinten_US

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