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Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, Oncorhynchus mykiss

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dc.creator McMillan, John R.
dc.creator Dunham, Jason B.
dc.creator Reeves, Gordon H.
dc.creator Mills, Justin S.
dc.creator Jordan, Chris E.
dc.date.accessioned 2012-10-31T15:55:59Z
dc.date.available 2012-10-31T15:55:59Z
dc.date.issued 2011-09-07
dc.identifier.citation McMillan, J. R., Dunham, J. B., Reeves, G. H., Mills, J. S., & Jordan, C. E. (2012). Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, oncorhynchus mykiss. Environmental Biology of Fishes, 93(3), 343-355. doi: 10.1007/s10641-011-9921-0 en_US
dc.identifier.uri http://hdl.handle.net/1957/34708
dc.description This is the publisher’s final pdf. The published article is copyrighted by Springer Science+Business Media and can be found at: http://www.springer.com. en_US
dc.description.abstract Alternative male phenotypes in salmonine fishes arise from individuals that mature as larger and older anadromous marine-migrants or as smaller and younger freshwater residents. To better understand the processes influencing the expression of these phenotypes we examined the influences of growth in length (fork length) and whole body lipid content in rainbow trout (Oncorhynchus mykiss). Fish were sampled from the John Day River basin in northeast Oregon where both anadromous ("steelhead") and freshwater resident rainbow trout coexist. Larger males with higher lipid levels had a greater probability of maturing as a resident at age-1+. Among males, 38% were maturing overall, and the odds ratios of the logistic model indicated that the probability of a male maturing early as a resident at age-1+ increased 49% (95% confidence interval (CI) = 23-81%) for every 5 mm increase in length and 33% (95% CI = 10-61%) for every 0.5% increase in whole body lipid content. There was an inverse association between individual condition and water temperature as growth was greater in warmer streams while whole body lipid content was higher in cooler streams. Our results support predictions from life history theory and further suggest that relationships between individual condition, maturation, and environmental variables (e.g., water temperature) are shaped by complex developmental and evolutionary influences. en_US
dc.description.sponsorship Funding was provided by NOAA, USGS, USFS, and the North Umpqua Foundation. en_US
dc.language.iso en_US en_US
dc.publisher Springer Science+Business Media en_US
dc.relation.ispartofseries Environmental Biology of Fishes en_US
dc.relation.ispartofseries Vol. 93 no. 3 en_US
dc.subject Rainbow trout en_US
dc.subject Steelhead trout en_US
dc.subject Alternative male phenotypes en_US
dc.subject Resident male maturity en_US
dc.subject Anadromy en_US
dc.subject Life history en_US
dc.title Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, Oncorhynchus mykiss en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1007/s10641-011-9921-0


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