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

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Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_57832DD0AC57
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Genetic and phenotypic population divergence on a microgeographic scale in brown trout.
Périodique
Molecular Ecology
Auteur(s)
Stelkens R.B., Jaffuel G., Escher M., Wedekind C.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Statut éditorial
Publié
Date de publication
2012
Peer-reviewed
Oui
Volume
21
Numéro
12
Pages
2896-2915
Langue
anglais
Résumé
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. Indeed, body shape could be largely explained by topographic stream slope, and variation in overall phenotype matched the flow regimes of the respective habitats.
Mots-clé
habitat fragmentation, isolation-by-distance, landscape genetics, local adaptation, phenotypic plasticity, Salmo trutta
Pubmed
Web of science
Open Access
Oui
Création de la notice
06/03/2012 12:14
Dernière modification de la notice
20/08/2019 14:11
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