Abstract
Food sharing with immatures is an important and relatively well studied aspect of infant care in many cooperative species. A key point that has not yet been fully addressed, however, is how increasing the difficulty of obtaining food influences the willingness of breeders and helpers to provision immature offspring. We used captive golden headed lion tamarins (Leontopithecus chrysomelas) to examine how breeders and helpers differ in provisioning juvenile individuals according to the level of difficulty of obtaining food. The level of difficulty in obtaining food was varied by placing the food inside tubes that allowed access only by adults. When food acquisition became more difficult, food sharing with juveniles and breeding females increased significantly. Begging calls by breeding females and juveniles increased during the experimental condition, which probably led to increases in food sharing. Breeders and helpers did not differ in their contribution to provisioning when food was easily available, nor did they differ in their contribution when food was difficult to obtain. Breeding males in callitrichids have a prominent role in transferring food to offspring, but contrary to our expectations, they did not increase food transfer in the experimental condition. An unexpected result was the increased investment of the breeding female into her current offspring when the level of difficulty of obtaining food was higher. We suggest that breeding lion tamarin females are not as constrained by reproductive costs as breeding females of other callitrichids. Degree of reproductive skew is hypothesized as a factor affecting the contribution of breeders and helpers to offspring care in cooperative breeding mammals, though we suggest that more studies are needed to validate such a generalization.
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Acknowledgments
We thank Drs. Christoph Knogge and Rosamunde Almond for their comments on a previous version of this manuscript, and Professor Charles Snowdon for his valuable suggestions. A. C. de A. Moura thanks the Brazilian Research Council (CNPq) and FAPESB for a scholarship that made this work possible. We thank several reviewers for their many comments on earlier drafts, and the editor, Dr. Joanna M. Setchell, for her constructive review of this paper.
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de A. Moura, A.C., Nunes, H.G. & Langguth, A. Food Sharing in Lion Tamarins (Leontopithecus chrysomelas): Does Foraging Difficulty Affect Investment in Young by Breeders and Helpers?. Int J Primatol 31, 848–862 (2010). https://doi.org/10.1007/s10764-010-9432-4
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DOI: https://doi.org/10.1007/s10764-010-9432-4