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Letters to Nature
Nature 343, 261 - 263 (18 January 1990); doi:10.1038/343261a0

Mammalian sex ratios and variation in costs of rearing sons and daughters

M. Gomendio*, T. H. Clutton-Brock, S. D. Albon, F. E. Guinness & M. J. Simpson*

*Sub-Department of Animal Behaviour, Madingley, Cambridge CB38AA, UK
Large Animal Research Group, Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK

IN red deer, the sex ratio of calves at birth (calculated as the proportion of calves born that are male) increases with the dominance rank of the mother1,2, whereas opposite trends exist in several populations of macaques and baboons3–7. Here we show that the subsequent survival and reproductive success of subordinate female red deer is depressed more by rearing sons than by rearing daughters, whereas the subsequent fitness of dominant females is unaffected by the sex of their present offspring. By contrast, among subordinate female macaques, the rearing of daughters has greater costs to the mother's subsequent fitness than does the rearing of sons, although again, no difference in the costs of rearing sons and daughters is found among dominant mothers. These findings indicate that both differences in the relative fitness of sons and daughters and differences in the relative costs of rearing male and female offspring can favour variation in the sex ratio.



1. Clutton-Brock, T. H., Albon, S. D. & Guinness, F. E. Nature 308, 358−360 (1984). | Article |
2. Clutton-Brock, T. H., Albon, S. D. & Guinness, F. E. Anim. Behav. 34, 460−461 (1986).
3. Simpson, M. J. A., Simpson, A. E., Hooley, J. & Zunz, M. Nature 290, 49−51 (1981). | Article | PubMed | ISI | ChemPort |
4. Simpson, M. J. A. & Simpson, A. E. Nature 300, 440−441 (1982). | Article | PubMed | ISI | ChemPort |
5. Gomendio, M. thesis, Univ. Cambridge (1988).
6. Altmann, J. Baboon Mothers and Infants (Harvard University Press, 1980).
7. Silk, J. B. Am. Nat. 121, 56−66 (1983). | Article | ISI |
8. Ritchie, M. Am. Nat. (in the press).
9. Clutton-Brock, T. H., Albon, S. D. & Guinness, F. E. Nature 289, 487−489 (1981). | Article |
10. Clutton-Brock, T. H., Guinness, F. E. & Albon, S. D. Red Deer: Behaviour and Ecology of Two Sexes (University of Chicago Press, 1982).
11. Clutton-Brock, T. H., Albon, S. D. & Guinness. F. E. Nature 337, 260−262 (1989). | Article | PubMed | ChemPort |
12. McCullough, P. & Nelder, J. A. Generalized Linear Models (Chapman & Hall, London, 1983).
13. Cox, D. R. The Analysis of Binary Data (Methuen, London, 1970).
14. Pickering, S. P. C. thesis, Univ. Durham (1983).
15. Lee, P. C. and Moss, C. J. Behavl Ecol. Sociobiol. 18, 353−361 (1986).
16. Dittus, W. P. J. Behaviour 69, 265−302 (1979). | ISI |
17. McNeilly, A. S. in The Physiology of Reproduction (eds Knobil, E. & Neill, J.) 2323−2349 (Raven, New York, 1988).
18. Gomendio, M. J. Zool. 217, 449−467 (1989).
19. Wolff, J. O. Behavl Ecol. Sociobiol. 23, 127−133 (1988).
20. Dhillon, J. S., Acharya, R. M., Tiwana, M. S. & Aggarwal, S. C. Anim. Prod. 12, 81−87 (1970). | ISI |
21. Singh, O. N., Singh, R. N. & Srivastava, R. R. P. Ind. J. vet Sci. 35, 245−248 (1965).
22. Fisher, R. A. The Genetical Theory of Natural Selection (Oxford University Press, 1930).

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