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journal article Feb 01, 2010

Ecological consequences of hybridization between native westslope cutthroat (Oncorhynchus clarkii lewisi) and introduced rainbow (Oncorhynchus mykiss) trout: effects on life history and habitat use

Joseph B. Rasmussen Michael D. Robinson Daniel D. Heath
Canadian Journal of Fisheries and Aquatic Sciences Vol. 67 No. 2 pp. 357-370 · Canadian Science Publishing
View at Publisher Save 10.1139/f09-191
Abstract
In the Upper Oldman River, Alberta, Canada, hybridization between introduced rainbow trout (RT; Oncorhynchus mykiss ) and native westslope cutthroat trout (WCT; Oncorhynchus clarkii lewisi ) has produced a genotypic gradient with rainbow trout alleles undetectable (<1%) at high elevations and increasing in abundance downstream. Few F1 hybrids were found, and genotype frequencies suggest strong backcrossing of hybrids to pure parental populations at both ends of the gradient. The increasing prevalence of RT alleles downstream is accompanied by a life history gradient such that RT alleles were positively associated with growth rate and negatively associated with survivorship. Although physical barriers extended the distribution of pure WCT downstream, several streams held genetically pure WCT in their uppermost reaches, even when no barriers were present. For example, RT alleles were undetectable in headwaters of Dutch Creek, which had no barriers but was very cold (average summer temperature <7.3 °C). We propose that RT alleles affect the choice of habitat, as well the metabolic characteristics that determine their life history and competitive abilities. Factors such as climate change, clear-cut logging, and anthropogenic enrichment that can lead to increased temperature and (or) productivity might be expected to result in an upstream shift of RT alleles.
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Metrics
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Citations
43
References
Details
Published
Feb 01, 2010
Vol/Issue
67(2)
Pages
357-370
License
View
Authors
J
Joseph B. Rasmussen

Department of Biological Sciences, University of Lethbridge, 4401 University Drive, Lethbridge, AB T1K 3H4, Canada.; Great Lakes Institute for Environmental Research and the Department of Biological Sciences, University of Windsor, 401 Sunset Ave., Windsor, ON N9B 3P4, Canada.

M
Michael D. Robinson

Department of Biological Sciences, University of Lethbridge, 4401 University Drive, Lethbridge, AB T1K 3H4, Canada.; Great Lakes Institute for Environmental Research and the Department of Biological Sciences, University of Windsor, 401 Sunset Ave., Windsor, ON N9B 3P4, Canada.

D
Daniel D. Heath

Department of Biological Sciences, University of Lethbridge, 4401 University Drive, Lethbridge, AB T1K 3H4, Canada.; Great Lakes Institute for Environmental Research and the Department of Biological Sciences, University of Windsor, 401 Sunset Ave., Windsor, ON N9B 3P4, Canada.

Cite This Article
Joseph B. Rasmussen, Michael D. Robinson, Daniel D. Heath (2010). Ecological consequences of hybridization between native westslope cutthroat (Oncorhynchus clarkii lewisi) and introduced rainbow (Oncorhynchus mykiss) trout: effects on life history and habitat use. Canadian Journal of Fisheries and Aquatic Sciences, 67(2), 357-370. https://doi.org/10.1139/f09-191
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