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Using genotype simulations and Bayesian analyses to identify individuals of hybrid origin in Australian bass: lessons for fisheries management

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Simulated genotypes, Bayesian analyses and molecular genetic data were used to detect individuals of hybrid origin and hybrid introgression between the Australian bass (Macquaria novemaculeata), a species extensively stocked in Australia, and estuary perch (Macquaria colonorum). Based on this analytical framework, 93% of the hybrids up to three generations later could be distinguished from the Australian bass. Individuals of hybrid origin were identified in all three rivers sampled. In addition, this study verified the fertility of hybrids between Australian bass and estuary perch as determined through genomic introgression. This study exemplifies an analytical procedure that has implications for identifying suitable individuals for use in breeding and restocking programmes for other species.
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Keywords: assignment tests; conservation genetics; genetic structure; hybridization; introgression; microsatellites

Document Type: Regular Paper

Publication date: 01 February 2008

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