Abstract
In most cooperatively breeding species, reproduction is monopolised by a subset of group members. However, in some species most or all individuals breed. The factors that affect reproductive success in such species are vital to understanding why multiple females breed. A key issue is whether or not the presence of other breeders is costly to an individual’s reproductive success. This study examines the factors that affect the post-parturition component of reproductive success in groups of communal-breeding banded mongoose (Mungos mungo), where up to ten females breed together. Per-litter reproductive success was low (only 18% of pups survived from birth to independence). Whilst singular breeding was wholly unsuccessful, there were costs associated with breeding in the presence of increasing numbers of other females and in large groups. Synchronisation of parturition increased litter success, probably because it minimises the opportunity for infanticide or decreases competitive asymmetry between pups born to different females. There was no evidence of inbreeding depression, and reproductive success was generally higher in litters where females only had access to related males within their group. I conclude that communal breeding in female banded mongooses represents a compromise between the benefits of group-living and communal pup care on the one hand, and competition between females to maximise their personal reproductive success on the other. Such conflicts are likely to occur in most communal breeding species. Whilst communal breeding systems are generally considered egalitarian, negative effects of co-breeders on individual reproductive success is still an issue.
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Acknowledgements
I thank Emily Otali and Francis Mwanguhya for their invaluable assistance with data collection, Tim Clutton-Brock and Tim Coulson for advice, and Andy Russell, Mike Cant, Giacomo Tavecchia and the reviewers for comments on the manuscript. I am grateful to the Uganda Wildlife Authority for allowing me to conduct this research in Queen Elizabeth National Park. For financial support, I thank the Biotechnology and Biological Sciences Research Council, the Ian Karten Charitable Trust, and in Cambridge: Magdalene College, the Board of Graduate Studies, the Cambridge Philosophical Society, and the Department of Zoology.
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Gilchrist, J.S. Reproductive success in a low skew, communal breeding mammal: the banded mongoose, Mungos mungo . Behav Ecol Sociobiol 60, 854–863 (2006). https://doi.org/10.1007/s00265-006-0229-6
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DOI: https://doi.org/10.1007/s00265-006-0229-6