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© 1998 International Society for Behavioral Ecology

research-article

Life history consequences of social complexity a comparative study of ground-dwelling sciurids

Daniel T. Bhumstein and Kenneth B. Armitage

Department of Systematics and Ecology, University of Kansas Lawrence, KS 66045, USA

ABSTRACT

We examined life-history consequences of increased social complexity in ground-dwelling schnid rodents. We derived a continuous metric of social complexity from demographic data. Social complexity increased with the number of age-sex "roles" that interacted in a social group. Data were analyzed by computing phylogeneticaDy independent contrasts and by using phylogenetic autocorrelation to estimate and then remove the marimiim amount of variation in life-history variables that could be attributed to phylogenetic similarity. Analyses that incorporated estimates of phytogeny generated consistent results. As social complexity increased, a smaller proportion of adult females bred, there was a greater time to first reproduction, litter size decreased, and there was greater first-year offspring survival. Social complexity influenced neither gestation nor lactation time. Thus, social complexity has costs in terms of a reduction in the annual per-capita number of offspring produced but benefits in terms of enhanced offspring survival.

Key words: Cynomys, costs and benefits of sociality, life history, Marmota, social complexity, Spermophilus.


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