The male's dilemma: Increased offspring production is more paternity to steal (original) (raw)
Summary
Large potential effects of male care on the number of offspring females successfully raise are not sufficient to select for caring males because of the pervasive importance of mating competition. Males face a version of ‘the social dilemma’, in which increased production increases the pay-off for theft. Models of the allocation of male effort partitioned between caring for babies and competing for paternity show that the optimal allocation to care is very low under a wide range of conditions. Like sex allocation where the alternatives are male versus female function or sons versus daughters, the pay-offs to one alternative are always strongly frequency dependent. Because that alternative (male function, sons, male mating effort) pays so well when rare, it cannot remain rare under most conditions. Here we consider the consequences of partitioning mating effort into mate guarding and all other forms of mating conflict. If a male gets all his partner's conceptions while guarding, gaining them at a constant rate, there are two possible regions of stability. The evolutionarily stable strategy (ESS) depends on a parameter scaling the decisiveness of (non-guarding) mating conflict. When marginal returns from conflict decrease with scale, almost all effort goes into guarding. When marginal returns increase, the ESS devotes all effort to mating. Even when the potential effect of care is large, male equilibrium strategies allocate little effort to it. We also report the results of computer simulations showing that care increases if gains from guarding saturate quickly, so that a male is assured of the paternity of most of his partner's offspring with little guarding, and consequently the pool of unguarded conceptions open to competion shrinks sharply. But even when the male's dilemma is very much reduced, it still substantially limits the allocation to care. The results of both computer simulations and mathematical analysis converge with other lines of evidence that mating has much stronger effects than parenting in shaping male strategies.
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References
- Alexander, R.D., Hoogland, J.L., Howard, R.D., Noonan, K.M. and Sherman, P.W., (1979) Sexual dimorphisms and breeding systems in pinnepeds, ungulates, primates, and humans. In_Evolutionary biology and human social behavior: an anthropological perspective_ (N. Chagnon and W. Irons, eds) pp. 402–35. Duxbury Press, North Scituate, MA.
Google Scholar - Birkhead, T.R. and Moller, A.P. (1992)Sperm Competition in Birds: Evolutionary Causes and Consequences. Academic Press, London.
Google Scholar - Charnov, E.L. (1982)The Theory of Sex Allocation. Princeton University Press, Princeton.
Google Scholar - Davies, N.B. (1991) Mating systems. In_Behavioural ecology: an evolutionary approach_, third edition, (J. Krebs and N. Davies, eds) pp. 263–94. Blackwell Scientific Publications, Oxford.
Google Scholar - Davies, N.B. (1992)Dunnock Behaviour and Social Evolution. Oxford University Press, Oxford.
Google Scholar - Fisher, R.A. (1930)The Genetical Theory of Natural Selection. Clarendon Press, Oxford. Reprinted 1958, Dover, New York.
Google Scholar - Hamilton, W.D. (1967) Extraordinary sex ratios.Science 156 477–88.
PubMed Google Scholar - Hawkes, K. (1990) Why do men hunt? Some benefits for risky strategies. In_Risk and uncertainty_ (E. Cashdan, ed.) pp. 145–66. Westview Press, Boulder.
Google Scholar - Hawkes, K. (1993) Why hunter—gatherers work: an ancient version of the problem of public goods.Curr. Anthropol. 34 341–61.
Google Scholar - Hirshleifer, J. (1991) The paradox of power.Econ. Politics 3 177–200.
Google Scholar - Hirshleifer, J. (1995) Anarchy and its Breakdown.Journal of Political Economy 103 26–52.
Google Scholar - Kleirman, D.G. (1977) Monogamy in mammals.Q. Rev. Biol. 52 39–69.
PubMed Google Scholar - Lack, D. (1968)Ecological Adaptations for Breeding in Birds. Metheun, London.
Google Scholar - Lancaster, J. and Lancaster, C. (1983) Parental investment: the hominid adaptation. In_How humans adapt: a biocultural odyssey_ (D. Ortner, ed.) pp. 33–65. Smithsonian Institution Press, Washington, DC.
Google Scholar - Lovejoy, C.O. (1981) The origin of man.Science 211 341–50.
Google Scholar - Moller, A.P. (1994)Sexual Selection and the Barn Swallow. Oxford University Press, Oxford.
Google Scholar - Orians, G.H. (1969) On the evolution of mating systems in birds and mammals.Am. Nat. 103 589–603.
Google Scholar - Smuts, B.B. (1985)Sex and Friendship in Baboons. Aldine, New York.
Google Scholar - Smuts, B.B. and Gubernick, D.J. (1992) Male—infant relationships in nonhuman primates: paternal investment or mating effort? In_Father—Child relations: cultural and biosocial contexts_ (B. Hewlett, ed.) pp. 1–29. Aldine de Gruyter, New York.
Google Scholar - Tullock, G. (1974)The Social Dilemma: The Economics of War and Revolution. The Center for the Study of Public Choice, Blacksburg, VA.
Google Scholar - Washburn, S.L. and Lancaster, C. (1968) The evolution of hunting. In_Man the hunter_ (R. Lee and I. DeVore, ed.) pp. 293–303. Aldine, Chicago.
Google Scholar - Westneat, D.F. and Sherman, P.W. (1993) Parentage and the evolution of parental behavior.Behav. Ecol. 4 66–77.
Google Scholar - Westneat, D.F., Sherman, P.W. and Morton, M.L. (1990) The ecology and evolution of extra-pair copulations in birds. In_Current ornithology_ (D. Power, ed.)7, pp. 331–69. Plenum, New York.
Google Scholar - Whitten, P.L. (1986) Infants and adult males. In_Primate societies_ (B. Smuts, D. Cheyney, R. Seyfarth, R. Wrangham and T. Struhsaker, eds) pp. 343–57. University of Chicago Press, Chicago.
Google Scholar
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Authors and Affiliations
- Department of Anthropology, University of Utah, 84112, Salt Lake City, UT, USA
Kristen Hawkes & Alan R. Rogers - Department of Biology, University of Utah, 84112, Salt Lake City, UT, USA
Eric L. Charnov
Authors
- Kristen Hawkes
- Alan R. Rogers
- Eric L. Charnov
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Hawkes, K., Rogers, A.R. & Charnov, E.L. The male's dilemma: Increased offspring production is more paternity to steal.Evol Ecol 9, 662–677 (1995). https://doi.org/10.1007/BF01237661
- Issue date: November 1995
- DOI: https://doi.org/10.1007/BF01237661