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The role of local adaptation in metapopulation restorations

Published online by Cambridge University Press:  29 August 2003

Alexandre Robert
Affiliation:
Université Pierre et Marie Curie, Laboratoire d'Ecologie, CNRS-UMR 7625, Bât. A, 7ème étage, 7 quai Saint Bernard, Case 237, F-75252 Paris Cedex 05, France
Denis Couvet
Affiliation:
CRBPO, Muséum National d'Histoire Naturelle, 55 rue Buffon, 75005 Paris, France
François Sarrazin
Affiliation:
Université Pierre et Marie Curie, Laboratoire d'Ecologie, CNRS-UMR 7625, Bât. A, 7ème étage, 7 quai Saint Bernard, Case 237, F-75252 Paris Cedex 05, France
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Abstract

We propose an original approach to model the effect of the initial spatial distribution of a reintroduced metapopulation (one-patch release versus multi-patch release) on local adaptation. Genetic and demographic processes are considered to investigate how the different patterns of adaptation resulting from initial conditions affect metapopulation viability. In agreement with classical interpretations in the fields of population biology and evolutionary genetics, we observe an influence of the degree of environmental correlation among patches on demographic processes and an influence of inter-patch connection on genetic processes. However, our results uncover some further effects of the environment, owing to positive feedback interactions among demographic and genetic processes. When considering the one-patch release, demographic stochasticity engenders a delay in the colonization of initially empty patches. This delay enhances the genetic asymmetry among patches (in terms of local adaptation), which in turn increases demographic asymmetry. In contrast, the multi-patch release produces similar levels of adaptation among patches. Metapopulation dynamics is strongly influenced by these differences, with contrasting effects under different environments. The pattern of adaptation produced by the one-patch release strategy is optimal under a regime of recurrent slight perturbations or environmental stochasticity, while the multi-release strategy is optimal in the presence of rare and severe perturbations.

Type
Research Article
Copyright
2003 The Zoological Society of London

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