Document Detail


Density dependence and cooperation: theory and a test with bacteria.
MedLine Citation:
PMID:  19453724     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Adin Ross-Gillespie; Andy Gardner; Angus Buckling; Stuart A West; Ashleigh S Griffin
Related Documents :
19298494 - Investment in the public good through conditional phenotypes of large effect.
23380254 - Homage to barry commoner, a precursor of ecosocialism (may 28, 1917-september 30, 2012).
20470784 - Variable valuations and voluntarism under group selection: an evolutionary public goods...
11278084 - European resuscitation council guidelines 2000 for automated external defibrillation. a...
10176044 - Jcaho is adding numbers to inspection criteria.
17224144 - New hampshire house bill 1719-fn. "an act defining human life as beginning at the momen...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-08
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  63     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-01     Completed Date:  2009-11-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2315-25     Citation Subset:  IM    
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, King's Buildings, Edinburgh, United Kingdom. a.ross-gillespie@ed.ac.uk
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Cooperative Behavior
Humans
Models, Theoretical*
Population Density*
Population Dynamics
Pseudomonas aeruginosa* / physiology
Siderophores / metabolism
Chemical
Reg. No./Substance:
0/Siderophores

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Utilization of antiepileptic drugs during pregnancy: comparative patterns in 38 countries based on d...
Next Document:  The cost of reliable signaling: experimental evidence for predictable variation among males in a cos...