Abstract
Communal rearing of offspring may help mothers maximize their investment in offspring at a reduced cost to their own bodily condition, thus maximizing their potential for reproductive success. The objective of this study was to quantify the costs and benefits of communal rearing to prairie vole (Microtus ochrogaster) pups and mothers. Mothers were assigned to one of three social units: solitary mothers, singularly breeding groups (i.e. one mother and one non-reproductive sister) and plurally breeding groups (i.e. two lactating sisters). For each type of social unit, some replicates were provided with food ad libitum, while others were provided with limited food. The body mass of focal mothers (i.e. the first mother to produce a litter) was a significant predictor of pup growth. Regardless of food availability, litters of focal mothers in plurally breeding groups gained more weight than litters reared by solitary mothers. Pups reared in singularly breeding groups were intermediate in weight gain, but did not gain significantly more weight than solitary offspring. There was no difference in the body mass of focal mothers from each type of social unit, regardless of food availability. Within plurally breeding groups, the weight gain of the two litters and body mass of focal and second mothers did not differ. However, focal mothers from plurally breeding groups nursed fewer pups than solitary mothers and also fewer pups than their nestmates when food was limited. Our results suggest that plural breeding results in greater fitness to mothers than solitary and singular breeding.
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Acknowledgements
We thank V. Barko, C. Buckholtz and G. Feldhamer for helping us locate prairie voles. Several undergraduate students helped us with project, most notably E. O’Bryant. We thank P. Callahan, Y.K. Lin, A. Rypstra and R. Schaefer for their advice. B. Keane, E. Lacey and D. Meikle read an earlier version of this manuscript. L.D.H. was funded by an Animal Behavior Society Grant-in-Aid of Research, a Sigma Xi Grant-in-Aid of Research and a National Science Foundation Doctoral Dissertation Improvement Grant (IBN no. 0309068). N.G.S. was funded by the National Institute of Health (NIMH grant no. MH57115). The research was approved by the Miami University All University Animal Care Committee (Protocol no. 486) and was conducted in compliance with U.S. laws for the use of animals in research.
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Hayes, L.D., Solomon, N.G. Costs and benefits of communal rearing to female prairie voles (Microtus ochrogaster). Behav Ecol Sociobiol 56, 585–593 (2004). https://doi.org/10.1007/s00265-004-0815-4
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DOI: https://doi.org/10.1007/s00265-004-0815-4