Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss)
Canadian Journal of Fisheries and Aquatic Sciences
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Abstract
Abstract:In partially migratory species, such as Oncorhynchus mykiss, the emergence of life history phenotypes is often attributed to fitness trade-offs associated with growth and survival. Fitness trade-offs can be linked to reproductive tactics that vary between the sexes, as well as the influence of environmental conditions. We found that O. my kiss outmigrants are more likely to be female in nine populations throughout western North America (grand mean 65% female), in support of the hypothesis that anadromy is more likely to benefit females. This bias was not related to migration distance or freshwater productivity, as indicated by latitude. Within one O. my kiss population we also measured the resident sex ratio and did not observe a male bias, despite a high female bias among out migrants in that system. We provide a simulation to demonstrate the relationship between sex ratios and
the proportion of anadromy and show how sex ratios could be a valuable tool for predicting the prevalence of life history types in a population.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss) |
| Series title | Canadian Journal of Fisheries and Aquatic Sciences |
| DOI | 10.1139/cjfas-2013-0274 |
| Volume | 71 |
| Issue | 1 |
| Year Published | 2014 |
| Language | English |
| Publisher | NRC Research Press |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center |
| Description | 11 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Canadian Journal of Fisheries and Aquatic Sciences |
| First page | 70 |
| Last page | 80 |
| Country | Canada;United States |
| State | California;Idaho;Oregon;Washington |
| Google Analytic Metrics | Metrics page |