期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 18, 页码 7354-7359出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1217517110
关键词
microbes; Allee effect; eco-evolutionary feedback
资金
- Cancer Center Support Grant from the National Cancer Institute [P30CCA14051]
- Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program
- Pappalardo Fellowship at MIT
- MIT's Undergraduate Research Opportunities Program
- National Institutes of Health (NIH) R00 Pathways to Independence Award [GM085279-02]
- National Science Foundation Career Award [PHY-1055154]
- Pew Fellowship [2010-000224-007]
- Sloan Foundation Fellowship [BR2011-066]
- NIH New Innovator Award [DP2]
Natural populations throughout the tree of life undergo range expansions in response to changes in the environment. Recent theoretical work suggests that range expansions can have a strong effect on evolution, even leading to the fixation of deleterious alleles that would normally be outcompeted in the absence of migration. However, little is known about how range expansions might influence alleles under frequency-or density-dependent selection. Moreover, there is very little experimental evidence to complement existing theory, since expanding populations are difficult to study in the natural environment. In this study, we have used a yeast experimental system to explore the effect of range expansions on the maintenance of cooperative behaviors, which commonly display frequency-and density-dependent selection and are widespread in nature. We found that range expansions favor the maintenance of cooperation in two ways: (i) through the enrichment of cooperators at the front of the expanding population and (ii) by allowing cooperators to outrun an invading wave of defectors. In this system, cooperation is enhanced through the coupling of population ecology and evolutionary dynamics in expanding populations, thus providing experimental evidence for a unique mechanism through which cooperative behaviors could be maintained in nature.
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