Contemporary gene flow and the spatio-temporal genetic structure of subdivided newt populations (Triturus cristatus, T. marmoratus)

Jehle, R, Wilson, GA, Arntzen, JW and Burke, T 2005, 'Contemporary gene flow and the spatio-temporal genetic structure of subdivided newt populations (Triturus cristatus, T. marmoratus)' , Journal Of Evolutionary Biology, 18 , pp. 619-628.

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Gene flow and drift shape the distribution of neutral genetic diversity in metapopulations, but their local rates are difficult to quantify. To identify gene flow between demes as distinct from individual migration, we present a modified Bayesian method to genetically test for descendants between an immigrant and a resident in a nonmigratory life stage. Applied to a metapopulation of pond-breeding European newts (Triturus cristatus, T. marmoratus) in western France, the evidence for gene flow was usually asymmetric and, for demes of known census size (N), translated into maximally seven reproducing immigrants. Temporal sampling also enabled the joint estimation of the effective demic population size (Ne) and the immigration rate m (including nonreproductive individuals). Ne ranged between 4.1 and 19.3 individuals, Ne/N ranged between 0.05 and 0.65 and always decreased with N; m was estimated as 0.19–0.63, and was possibly biased upwards. We discuss how genotypic data can reveal fine-scale demographic processes with important microevolutionary implications.

Item Type: Article
Uncontrolled Keywords: amphibians; Bayesian statistics; effective population size; gene flow; metapopulation genetics; microsatellites; newts; Triturus.
Themes: Subjects / Themes > Q Science > QL Zoology
Subjects / Themes > Q Science > QH Natural history > QH301 Biology
Subjects outside of the University Themes
Schools: Schools > School of Environment and Life Sciences
Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Journal Of Evolutionary Biology
Publisher: Blackwell Publishing
Refereed: Yes
ISSN: 1010-061X
Depositing User: Users 29196 not found.
Date Deposited: 30 Oct 2009 11:59
Last Modified: 09 Aug 2017 02:34

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