A field test of the extent of bias in selection estimates after accounting for emigration
Evolutionary Ecology Research
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Abstract
Question: To what extent does trait-dependent emigration bias selection estimates in a natural system? Organisms: Two freshwater cohorts of Atlantic salmon (Salmo salar) juveniles. Field site: A 1 km stretch of a small stream (West Brook) in western Massachusetts. USA from which emigration could be detected continuously. Methods: Estimated viability selection differentials for body size either including or ignoring emigration (include = emigrants survived interval, ignore = emigrants did not survive interval) for 12 intervals. Results: Seasonally variable size-related emigration from our study site generated variable levels of bias in selection estimates for body size. The magnitude of this bias was closely related with the extent of size-dependent emigration during each interval. Including or ignoring the effects of emigration changed the significance of selection estimates in 5 of the 12 intervals, and changed the estimated direction of selection in 4 of the 12 intervals. These results indicate the extent to which inferences about selection in a natural system can be biased by failing to account for trait-dependent emigration. ?? 2005 Benjamin H. Letcher.
Suggested Citation
Letcher, B., Horton, G., Dubreuil, T., O'Donnell, M., 2005, A field test of the extent of bias in selection estimates after accounting for emigration: Evolutionary Ecology Research, v. 7, no. 4, p. 643-650.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A field test of the extent of bias in selection estimates after accounting for emigration |
| Series title | Evolutionary Ecology Research |
| Volume | 7 |
| Issue | 4 |
| Year Published | 2005 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Evolutionary Ecology Research |
| First page | 643 |
| Last page | 650 |