Population demography and the evolution of helping behaviors.
Détails
Télécharger: BIB_017ECB2ED803.P001.pdf (175.97 [Ko])
Etat: Public
Version: de l'auteur⸱e
Etat: Public
Version: de l'auteur⸱e
ID Serval
serval:BIB_017ECB2ED803
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Population demography and the evolution of helping behaviors.
Périodique
Evolution
ISSN
0014-3820 (Print)
ISSN-L
0014-3820
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
60
Numéro
6
Pages
1137-1151
Langue
anglais
Résumé
Limited dispersal may favor the evolution of helping behaviors between relatives as it increases their relatedness, and it may inhibit such evolution as it increases local competition between these relatives. Here, we explore one way out of this dilemma: if the helping behavior allows groups to expand in size, then the kin-competition pressure opposing its evolution can be greatly reduced. We explore the effects of two kinds of stochasticity allowing for such deme expansion. First, we study the evolution of helping under environmental stochasticity that may induce complete patch extinction. Helping evolves if it results in a decrease in the probability of extinction or if it enhances the rate of patch recolonization through propagules formed by fission of nonextinct groups. This mode of dispersal is indeed commonly found in social species. Second, we consider the evolution of helping in the presence of demographic stochasticity. When fecundity is below its value maximizing deme size (undersaturation), helping evolves, but under stringent conditions unless positive density dependence (Allee effect) interferes with demographic stochasticity. When fecundity is above its value maximizing deme size (oversaturation), helping may also evolve, but only if it reduces negative density-dependent competition.
Mots-clé
Altruism, Biological Evolution, Ecosystem, Fertility, Models, Biological, Mutation, Population Dynamics, Stochastic Processes
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 17:54
Dernière modification de la notice
20/08/2019 12:23