Journal
JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 23, Issue 12, Pages 2569-2578Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1420-9101.2010.02122.x
Keywords
altruism; fecundity; inclusive fitness; Moran model; survival homogeneous population
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Funding
- Natural Sciences and Engineering Research Council of Canada
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Studies of the evolution of a social trait often make ecological assumptions (of population structure, life history), and thus a trait can be studied many different times with different assumptions. Here, I consider a Moran model of continuous reproduction and use an inclusive fitness analysis to investigate the relationships between fecundity or survival selection and birth-death (BD) or death-birth (DB) demography on the evolution of a social trait. A simple symmetry obtains: fecundity (respectively survival) effects under BD behave the same as survival (respectively fecundity) effects under DB. When these results are specialized to a homogeneous population, greatly simplified conditions for a positive inclusive fitness effect are obtained in both a finite and an infinite population. The results are established using the elegant formalism of mathematical group theory and are illustrated with an example of a finite population arranged in a cycle with asymmetric offspring dispersal.
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