Abstract
The observed social systems of extant apes and humans suggest that the common ancestral state for Miocene hominoids was living in multimale–multifemale groups that exhibited a tendency to fission and fusion in response to ecological and/or social variables. The Hominoidea share a set of social commonalities, notably a social niche that extends beyond kin and beyond the immediate social group, as well as extensive intraspecific flexibility in social organization. We propose that an essential feature of hominoid evolution is the shift from limited plasticity in a generalized social ape to expanded behavioral plasticity as an adaptive niche. Whereas in most nonhominoid primates variability and flexibility take the shape of specific patterns of demographic flux and interindividual relationships, we can consider behavioral flexibility and plasticity as a means to an end in hominoid socioecological landscapes. In addition, the potential for innovation, spread, and inheritance of behavioral patterns and social traditions is much higher in the hominoids, especially the great apes, than in other anthropoid primates. We further suggest that this pattern forms a basis for the substantial expansion of social complexity and adaptive behavioral plasticity in the hominins, especially the genus Homo. Our objectives in this article are threefold: 1) summarize the variation in the social systems of extant hominoid taxa; 2) consider the evolutionary processes underlying these variations; and 3) expand upon the traditional socioecological model, especially with respect to reconstructions of early hominin social behavior. We emphasize a central role for both ecological and social niche construction, as well as behavioral plasticity, as basal hominoid characteristics. Over evolutionary time these characteristics influence the patterns of selection pressures and the resulting social structures. We propose that a mosaic of ecological and social inheritance patterns should be considered in the reconstruction of early hominin social systems.
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Acknowledgments
We thank Michael Plavcan and the late Charles Lockwood for organizing a brilliant symposium at the XXIIth Congress of the International Primatological Society (Edinburgh, UK, 2008), and inviting our participation in this special edition. We acknowledge the efforts of the editor, as well as two anonymous reviewers, whose thought-provoking commentary across multiple drafts greatly improved the quality of this manuscript. We thank the Department of Anthropology at the University of Auckland (N. Malone) and the Dean’s Office of the College of Arts and Letters at the University of Notre Dame (A. Fuentes) for supporting this research. This research was supported by NSF grants BNS-8311252, SBR-9600547, and BCS-0610233 and support from the Leakey Foundation (F. J. White). Chelsea Humphrey (Boston University) assisted in the production of the figures contained herein.
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Malone, N., Fuentes, A. & White, F.J. Variation in the Social Systems of Extant Hominoids: Comparative Insight into the Social Behavior of Early Hominins. Int J Primatol 33, 1251–1277 (2012). https://doi.org/10.1007/s10764-012-9617-0
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DOI: https://doi.org/10.1007/s10764-012-9617-0