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Title

Evolutionary aspects of population structure for molecular and quantitative traits in the freshwater snail Radix balthica

Authors
Evanno, G.
Goudet, J.
Published in Journal of Evolutionary Biology. 2006, vol. 19, no. 4, p. 1071-1082
Abstract Detecting the action of selection in natural populations can be achieved using the QST–FST comparison that relies on the estimation of FST with neutral markers, and QST using quantitative traits potentially under selection. QST higher than FST suggests the action of directional selection and thus potential local adaptation. In this article, we apply the QST–FST comparison to four populations of the hermaphroditic freshwater snail Radix balthica located in a floodplain habitat. In contrast to most studies published so far, we did not detect evidence of directional selection for local optima for any of the traits we measured: QST calculated using three different methods was never higher than FST. A strong inbreeding depression was also detected, indicating that outcrossing is probably predominant over selfing in the studied populations. Our results suggest that in this floodplain habitat, local adaptation of R. balthica populations may be hindered by genetic drift, and possibly altered by uneven gene flow linked to flood frequency.
Keywords DominanceFloodplainFSTInbreeding depressionLocal adaptationQSTRadix balthica
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Article (Published version) (363 Kb) - public document Free access
Structures
Research groups Ecology and Aquatic Biology
ISE Pôle Sciences
ISE Biodiversité
ISE Eau
Project FNS: 31-59326.99
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(ISO format)
EVANNO, G., CASTELLA, Emmanuel, GOUDET, J. Evolutionary aspects of population structure for molecular and quantitative traits in the freshwater snail Radix balthica. In: Journal of Evolutionary Biology, 2006, vol. 19, n° 4, p. 1071-1082. https://archive-ouverte.unige.ch/unige:26770

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Deposited on : 2013-03-13

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