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Multi-male groups positively linked to infant survival and growth in a cooperatively breeding primate

  • Laura A. Heslin Piper
  • James M. Dietz
  • Becky E. Raboy
Original Article

Abstract

Cooperative breeding is a system where helper individuals care for breeding individuals’ offspring. As a result, social environment is likely to play a key role in regulating reproductive success. In primates, cooperative breeding is only found in the family Callitrichidae. Callitrichid males typically provide more infant care than non-breeding females, and in many callitrichid species, the presence of multiple males has been linked to infant survival. Leontopithecus chrysomelas (the golden-headed lion tamarin) is an endangered callitrichid found in the Atlantic Forest of Brazil. We used long-term data for wild L. chrysomelas to assess the influence of social group composition on reproductive success. Our survival model found that infant survival was negatively associated with group size, but this cost was mitigated by the presence of multiple adult males vs a single adult male. We also found that infants raised in groups with multiple adult males exhibited faster growth rates and higher adult weights than infants raised with a single adult male. This study adds novel evidence for the positive influence of adult males on callitrichid reproduction, demonstrating that adult males influence infant growth, as well as survival, in wild populations of cooperatively breeding primates. We suggest that social group composition, particularly the presence of adult males, be considered in future conservation strategies given its importance for reproductive success.

Significance statement

In cooperatively breeding species, group members care for breeding individuals’ offspring. Due to this care, group composition may have a strong influence on infant success. In cooperatively breeding primates, males often provide more infant care than females. We investigated the influence of group composition on infant success in a cooperatively breeding primate, the golden-headed lion tamarin. Using long-term field data, we found that infant survival decreased as group size increased. However, this effect was reduced when multiple adult males were present in the group compared to a single male. We also found that infants grew faster and reached larger adult weights in the presence of multiple adult males compared to a single male. Our results demonstrate the importance of group composition for cooperative breeders and provide new evidence for the positive influence of adult males on cooperatively breeding primate infants.

Keywords

Leontopithecus chrysomelas Callitrichid Primate Cooperative breeding Social behavior Reproductive success 

Notes

Acknowledgments

We thank the Brazilian Institute for the Environment and Renewable Natural Resources (IBAMA), the Brazilian Science Council (CNPq), and the owners of Fazenda Incon for permission to conduct work in and around Una Biological Reserve. We are especially grateful for the instrumental support of Saturnino N. de Souza and Paulo Cesar Cruz. The University of Maryland, Smithsonian Institution, and Instituto de Estudos Socioambientais do Sul da Bahia (IESB) provided institutional support during the field portion of this study. We are grateful to our field assistants Jose Renato, Daniel Batista, Gilvan Gomes Mota, Gilvánio Gomes Mota, and Jiomário Santos Sousa. We thank our veterinarians Lilian Catenacci and Rafael Monteiro. Nayara Cardoso, Carlos Guidorizzi, Kristel De Vleeschouwer, Cecilia Keirulff, Leonardo Oliveira, and Leonardo Neves gave invaluable assistance in the field. Further thanks to Sarah Hankerson and to Lily Hu for data entry and organization. We also thank Diane Chan, Nathan Taback, and Marty Krkosek for advice on statistics, and Deborah McLennan and Helen Rodd for their guidance and advice during the analysis stage of this research. We thank the anonymous reviewers for their helpful comments and feedback.

Funding information

This work was supported by the World Wildlife Fund, the Durrell Wildlife Conservation Trust, the Margot Marsh Biodiversity Foundation, the Lion Tamarins of Brazil Fund, the Tulsa Zoo, a National Science Foundation Research and Training Grant (BIR-9602266 to the University of Maryland), Sigma Xi (to BER), and a Eugenie Clark Fellowship (to BER). The analysis portion of this study was funded by a National Sciences and Engineering Research Council Discovery Grant (RGPIN-2014-04964 to BER).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. This research complied with the guidelines of the University of Maryland Animal Care and Use Committee (under protocol numbers: R-91-07, R-93-39, R-01-13A, R-01-13B, R-04-43, R-07-75) and all applicable Brazilian laws.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Laura A. Heslin Piper
    • 1
  • James M. Dietz
    • 2
    • 3
  • Becky E. Raboy
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of TorontoTorontoCanada
  2. 2.Program in Behavior, Ecology, Evolution, & SystematicsUniversity of MarylandCollege ParkUSA
  3. 3.Save the Golden Lion TamarinSilver SpringUSA

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