Demography of source-sink populations and the evolution of ecological niches

Détails

ID Serval
serval:BIB_49EBFCF73DDF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Demography of source-sink populations and the evolution of ecological niches
Périodique
Evolutionary Ecology
Auteur(s)
Kawecki T.J.
ISSN
0269-7653
Statut éditorial
Publié
Date de publication
1995
Peer-reviewed
Oui
Volume
9
Numéro
1
Pages
38-44
Langue
anglais
Résumé
The demography of populations living in variable environments is an important factor molding the evolution of ecological niches, for it determines the relative strength of selection pressures on adaptations to different habitats. Here I consider a coarse-grained environment consisting of two habitat types and investigate how the selection pressure on reproductive success in different habitats depends on their quality and frequency and the dispersal pattern. The results suggest that selection on adaptations to optimal habitats will usually be stronger than on adaptations to poor habitats and the ecological niche will thus tend to be an evolutionarily conservative character. It is because under the habitat choice or limited dispersal that seem to prevail in natural populations, more individuals encounter the better habitat than would be expected solely on the basis of its relative area. This bias results in reduced selection pressure on reproductive success in the poorer habitat. With habitat choice or limited dispersal, selection pressure on reproductive success in the poorer habitat may exceed that on reproductive success in the better habitat only if the poorer habitat is much more frequent in the environment than the better habitat and the difference in their quality is not large.
Mots-clé
demography , dispersal, ecological niche, evolution, heterogeneous environments, natural selection, source-sink populations
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Création de la notice
19/11/2007 11:25
Dernière modification de la notice
03/03/2018 16:55
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