Does colonization asymmetry matter in metapopulations?

Détails

Ressource 1Télécharger: BIB_DACCB9077031.P001.pdf (424.96 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_DACCB9077031
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Does colonization asymmetry matter in metapopulations?
Périodique
Proceedings of the Royal Society B Biological Sciences
Auteur(s)
Vuilleumier S., Possingham H.P.
ISSN
0962-8452 (Print)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
273
Numéro
1594
Pages
1637-1642
Langue
anglais
Résumé
Despite the considerable evidence showing that dispersal between habitat patches is often asymmetric, most of the metapopulation models assume symmetric dispersal. In this paper, we develop a Monte Carlo simulation model to quantify the effect of asymmetric dispersal on metapopulation persistence. Our results suggest that metapopulation extinctions are more likely when dispersal is asymmetric. Metapopulation viability in systems with symmetric dispersal mirrors results from a mean field approximation, where the system persists if the expected per patch colonization probability exceeds the expected per patch local extinction rate. For asymmetric cases, the mean field approximation underestimates the number of patches necessary for maintaining population persistence. If we use a model assuming symmetric dispersal when dispersal is actually asymmetric, the estimation of metapopulation persistence is wrong in more than 50% of the cases. Metapopulation viability depends on patch connectivity in symmetric systems, whereas in the asymmetric case the number of patches is more important. These results have important implications for managing spatially structured populations, when asymmetric dispersal may occur. Future metapopulation models should account for asymmetric dispersal, while empirical work is needed to quantify the patterns and the consequences of asymmetric dispersal in natural metapopulations.
Mots-clé
Animals, Computer Simulation, Ecosystem, Models, Biological, Population Dynamics
Pubmed
Web of science
Création de la notice
15/07/2008 14:13
Dernière modification de la notice
03/03/2018 21:55
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