Genetic and phenotypic population divergence on a microgeographic scale in brown trout

Molecular Ecology
Rike B StelkensClaus Wedekind

Abstract

Salmonid populations of many rivers are rapidly declining. One possible explanation is that habitat fragmentation increases genetic drift and reduces the populations' potential to adapt to changing environmental conditions. We measured the genetic and eco-morphological diversity of brown trout (Salmo trutta) in a Swiss stream system, using multivariate statistics and Bayesian clustering. We found large genetic and phenotypic variation within only 40 km of stream length. Eighty-eight percent of all pairwise F(ST) comparisons and 50% of the population comparisons in body shape were significant. High success rates of population assignment tests confirmed the distinctiveness of populations in both genotype and phenotype. Spatial analysis revealed that divergence increased with waterway distance, the number of weirs, and stretches of poor habitat between sampling locations, but effects of isolation-by-distance and habitat fragmentation could not be fully disentangled. Stocking intensity varied between streams but did not appear to erode genetic diversity within populations. A lack of association between phenotypic and genetic divergence points to a role of local adaptation or phenotypically plastic responses to habitat heterogeneity...Continue Reading

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Citations

Dec 20, 2012·BMC Evolutionary Biology·Rike B StelkensClaus Wedekind
Feb 25, 2014·Trends in Ecology & Evolution·Jonathan L RichardsonDavid K Skelly
Feb 3, 2016·Evolutionary Applications·Alexandre GouskovChristoph Vorburger
Nov 28, 2015·Scientific Reports·Laetitia G E WilkinsClaus Wedekind
Dec 4, 2014·Evolutionary Applications·Catalina Monzón-ArgüelloCarlos Garcia de Leaniz
Sep 26, 2019·Proceedings. Biological Sciences·David NusbaumerClaus Wedekind
Aug 5, 2017·Ecology and Evolution·Romain SavaryLuca Fumagalli
Jan 17, 2017·Trends in Ecology & Evolution·Winsor H LoweFred W Allendorf
May 6, 2021·Animals : an Open Access Journal From MDPI·Diana SantosTânia V Madureira

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