Abstract
Within and across species of primates, the number of males in primate groups is correlated with the number of females. This correlation may arise owing to ecological forces operating on females, with subsequent competition among males for access to groups of females. The temporal relationship between changes in male and female group membership remains unexplored in primates and other mammalian groups. We used a phylogenetic comparative method for detecting evolutionary lag to test whether evolutionary change in the number of males lags behind change in the number of females. We found that change in male membership in primate groups is positively correlated with divergence time in pairwise comparisons. This result is consistent with male numbers adjusting to female group size and highlights the importance of focusing on females when studying primate social evolution.
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Selected References
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- Deaner R. O., Nunn C. L. How quickly do brains catch up with bodies? A comparative method for detecting evolutionary lag. Proc Biol Sci. 1999 Apr 7;266(1420):687–694. doi: 10.1098/rspb.1999.0690. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Emlen S. T., Oring L. W. Ecology, sexual selection, and the evolution of mating systems. Science. 1977 Jul 15;197(4300):215–223. doi: 10.1126/science.327542. [DOI] [PubMed] [Google Scholar]
- Nunn C. L., Gittleman J. L., Antonovics J. Promiscuity and the primate immune system. Science. 2000 Nov 10;290(5494):1168–1170. doi: 10.1126/science.290.5494.1168. [DOI] [PubMed] [Google Scholar]
- Purvis A. A composite estimate of primate phylogeny. Philos Trans R Soc Lond B Biol Sci. 1995 Jun 29;348(1326):405–421. doi: 10.1098/rstb.1995.0078. [DOI] [PubMed] [Google Scholar]
- van Schaik C. P., Kappeler P. M. Infanticide risk and the evolution of male-female association in primates. Proc Biol Sci. 1997 Nov 22;264(1388):1687–1694. doi: 10.1098/rspb.1997.0234. [DOI] [PMC free article] [PubMed] [Google Scholar]