Concordant genetic estimators of migration reveal anthropogenically enhanced source-sink population structure in the river sculpin, Cottus gobio.

Genetics
Bernd Hänfling, David 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 FST 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 FST was used as an indirect index of relative gene flow rather than being translated to Nm. Since true par...Continue Reading

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Citations

Aug 13, 2011·Molecular Biology and Evolution·David WeetmanMartin J Donnelly
Jul 6, 2010·Ecological Applications : a Publication of the Ecological Society of America·Darragh J Woodford, Angus R McIntosh
Feb 3, 2016·Evolutionary Applications·Alexandre GouskovChristoph Vorburger
Jul 9, 2010·Theoretical Population Biology·Séverine VuilleumierOlivier Lévêque
Aug 1, 2008·Evolutionary Applications·Joost A M RaeymaekersFilip A M Volckaert
Mar 5, 2013·Molecular Ecology·Daniela KellerMaarten J van Strien
Sep 1, 2012·Molecular Ecology·Alyson M AndreasenMatthew L Forister
Nov 28, 2012·Biological Reviews of the Cambridge Philosophical Society·Michel BaguetteCamille Turlure
May 1, 2010·Evolutionary Applications·Simon BlanchetGéraldine Loot
Apr 30, 2016·Ecology and Evolution·Lisa SundqvistDavid Kleinhans
Feb 27, 2018·Journal of Fish Biology·B V Schmidt, J F Schaefer
Jan 1, 2018·Journal of the American Water Resources Association·Kate A SchofieldAmina I Pollard

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