Estimation of introgression in cutthroat trout populations using microsatellites |
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Authors: | Victoria L Pritchard Ken Jones David E Cowley |
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Institution: | (1) Department of Fishery and Wildlife Sciences, New Mexico State University, MSC 4901, P.O. Box 30003, Las Cruces, NM 88003, USA;(2) Genetic Identification Services, Chatsworth, CA 91311, USA |
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Abstract: | Introgressive hybridization, mediated by anthropogenic activity, poses a threat to numerous and diverse taxa. The management
of introgressed individuals or populations within species of conservation concern is currently the subject of scientific and
political debate. We investigate the utility of 10 non-diagnostic microsatellite loci for investigating admixture from introduced
Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and rainbow trout (O. mykiss) within 25 putative Rio Grande cutthroat trout (O. c. virginalis) populations. We apply five different approaches (correspondence analysis, maximum-likelihood assignment tests, an admixture
estimator based on allele frequencies, an admixture estimator based on coalescent theory and an admixture estimator implementing
a Bayesian method) and use two alternative O. c. virginalis reference samples. All approaches were capable of identifying one population that consisted entirely of introduced O. c. bouvieri, and three out of five approaches enabled us to discriminate those populations with relatively high levels of non-native
introgression from those populations with little or none. Actual estimates of admixture coefficients within a test population,
varied, however, with the approach and reference sample used. These results have important implications for policies dividing
populations into different management categories according to the estimated proportion of non-native genetic material that
they contain. |
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Keywords: | Conservation Endangered Species Act Hybrid Introgression Oncorhynchus clarkii Microsatellite |
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