Density dependence and cooperation: theory and a test with bacteria.

Détails

ID Serval
serval:BIB_C0749225A969
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Compte-rendu: analyse d'une oeuvre publiée.
Collection
Publications
Titre
Density dependence and cooperation: theory and a test with bacteria.
Périodique
Evolution
Auteur(s)
Ross-Gillespie A., Gardner A., Buckling A., West S.A., Griffin A.S.
ISSN
1558-5646[electronic]
Statut éditorial
Publié
Date de publication
2009
Volume
63
Numéro
9
Pages
2315-25
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't - Publication Status: ppublish
Résumé
Although cooperative systems can persist in nature despite the potential for exploitation by noncooperators, it is often observed that small changes in population demography can tip the balance of selective forces for or against cooperation. Here we consider the role of population density in the context of microbial cooperation. First, we account for conflicting results from recent studies by demonstrating theoretically that: (1) for public goods cooperation, higher densities are relatively unfavorable for cooperation; (2) in contrast, for self-restraint-type cooperation, higher densities can be either favorable or unfavorable for cooperation, depending on the details of the system. We then test our predictions concerning public goods cooperation using strains of the pathogenic bacterium Pseudomonas aeruginosa that produce variable levels of a public good-iron-scavenging siderophore molecules. As predicted, we found that the relative fitness of cheats (under-producers) was greatest at higher population densities. Furthermore, as assumed by theory, we show that this occurs because cheats are better able to exploit the cooperative siderophore production of other cells when they are physically closer to them.
Pubmed
Open Access
Oui
Création de la notice
16/09/2009 7:52
Dernière modification de la notice
20/08/2019 15:34
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