Mutational collapse of fitness in marginal habitats and the evolution of ecological specialisation

Détails

ID Serval
serval:BIB_EF1D52714ADF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Mutational collapse of fitness in marginal habitats and the evolution of ecological specialisation
Périodique
Journal of Evolutionary Biology
Auteur(s)
Kawecki T.J., Barton N.H., Fry J.D.
ISSN
1010-061X
Statut éditorial
Publié
Date de publication
1997
Peer-reviewed
Oui
Volume
10
Numéro
3
Pages
407-429
Langue
anglais
Résumé
In spatially heterogeneous environments, natural selection for maintenance of adaptation to habitats that contribute little to the population's reproduction is weak. In this paper we model a mechanism that can result in loss of fitness in such marginal habitats, and thus lead to specialisation on the main habitat. It involves accumulation of mutations that are deleterious in the marginal habitat but neutral or nearly so in the main habitat (mutations deleterious in the main habitat and neutral in the marginal habitat have a negligible influence). If the contribution of the marginal habitat to total reproduction in the absence of the mutations is less than a threshold value, selection is too weak to counter accumulation of such mutations. A positive feedback then results in loss of fitness in the marginal habitat. This mechanism does not require antagonistic pleiotropy in adaptation to different habitats, although antagonistic pleiotropy facilitates the mutational collapse of fitness in the marginal habitat. We suggest that deleterious mutations with habitat-specific expression may play a role in the evolution of ecological specialisation and promote evolutionary conservatism of ecological niches.
Mots-clé
ecological niche, fitness, heterogeneous environment, mutation load, specialisation
Web of science
Open Access
Oui
Création de la notice
19/11/2007 11:53
Dernière modification de la notice
09/05/2019 3:11
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