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Concordant genetic estimators of migration reveal anthropogenically enhanced source-sink population structure in the River Sculpin, Cottus gobio

Hänfling, B.; Weetman, D.

Authors

Dr Bernd Haenfling B.Haenfling@hull.ac.uk
Senior Lecturer/ Chair of the Evolutionary Biology Group (EvoHull)

D. Weetman



Abstract

River systems are vulnerable to natural and anthropogenic habitat fragmentation and will often harbor populations deviating markedly from simplified theoretical models. We investigated fine-scale population structure in the sedentary river fish Cottus gobio using microsatellites and compared migration estimates from three F-ST estimators, a coalescent maximum-likelihood method and Bayesian recent migration analyses. Source-sink structure was evident via asymmetry in migration and genetic diversity with smaller upstream locations emigration biased and larger downstream subpopulations immigration biased. Patterns of isolation by distance suggested that the system was largely, but not entirely, in migration-drift equilibrium, with headwater populations harboring a signal of past colonizations and in some cases also recent population bottlenecks. Up- vs. downstream asymmetry in population structure was partly attributable to the effects of flow direction, but was enhanced by weirs prohibiting compensatory upstream migration. Estimators of migration showed strong correspondence, at least in relative terms, especially if pairwise F-ST was used as an indirect index of relative gene flow rather than being translated to Nm. Since true parameter values are unknown in natural systems, comparisons among estimators are important, both to determine confidence in estimates of migration and to validate the performance of different methods.

Journal Article Type Article
Publication Date Jul 1, 2006
Journal GENETICS
Print ISSN 0016-6731
Electronic ISSN 0016-6731
Publisher Genetics Society of America
Peer Reviewed Peer Reviewed
Volume 173
Issue 3
Pages 1487-1501
APA6 Citation Hänfling, B., & Weetman, D. (2006). Concordant genetic estimators of migration reveal anthropogenically enhanced source-sink population structure in the River Sculpin, Cottus gobio. Genetics, 173(3), 1487-1501. doi:10.1534/genetics.105.054296
DOI https://doi.org/10.1534/genetics.105.054296
Keywords Genetics
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