| 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. |
| Genre: | Article |
| ProdID: | 70029567 |
| Citation Author: | Letcher, B. H.; Horton, G. E.; Dubreuil, T. L.; O'Donnell, M. J. |
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| Citation End Page: | 650 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Evolutionary Ecology Research |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | A field test of the extent of bias in selection estimates after accounting for emigration; 2005; Article; Journal; Evolutionary Ecology Research; Letcher, B. H.; Horton, G. E.; Dubreuil, T. L.; O‘Donnell, M. J. |
| Citation Start Page: | 643 |
| Citation Volume: | 7 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | A field test of the extent of bias in selection estimates after accounting for emigration; 2005; Article; Journal; Evolutionary Ecology Research; Letcher, B. H.; Horton, G. E.; Dubreuil, T. L.; O‘Donnell, M. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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