Abstract
'Queen-worker conflict'1 and 'local mate competition'2,3 have frequently been used to help explain female-biased sex ratios in the social Hymenoptera. In this report I show that neither of these theories is able to explain brood-size dependent sex ratios in an allodapine bee, Exoneura bicolor. Most nests of this species contain two or more related females, and reproductivity per female increases as a function of the number of individuals cooperating in joint nest use. I argue that 'local resource enhancement' may explain sex-ratio bias in this species and that similar bias may be expected in other presocial insects.
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Trivers, R. L. & Hare, H. Science 191, 249–263 (1976).
Hamilton, W. D. Science 156, 477–488 (1967).
Alexander, R. D. & Sherman, P. W. Science 196, 494–500 (1977).
Sakagami, S. E. Insectes soc. 7, 231–249 (1960).
Michener, C. D. The Social Behaviour of the Bees (Harvard University Press, 1974).
Schwarz, M. P. Insectes soc. 33, 258–277 (1986).
Schwarz, M. P. Behavl Ecol. Sociobiol. 21, 387–392 (1987).
Schwarz, M. P. thesis, Monash Univ. (1987).
Schwarz, M. P., Scholz, O. & Jensen, G. J. Aust. entom. Soc. 26, 355–359 (1987).
Joshi, N. V. & Gadagkar, R. J. Genet. 64, 41–58 (1985).
Yamaguchi, T. Nature 318, 460–462 (1985).
Frank, S. A. Behavl Ecol. Sociobiol. 20, 195–201 (1987).
Clark, A. B. Science 201, 163–165 (1978).
Emlen, S. T., Emlen, J. M. & Levin, S. A. Am. Nat. 127, 1–8 (1986).
Michener, C. D. Insectes soc. 11, 317–342 (1964).
Lin, N. & Michener, C. D. Q. Rev. Biol. 47, 131–159 (1972).
Stubblefield, J. W. & Charnov, E. L. Heredity 57, 181–187 (1986).
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Schwarz, M. Local resource enhancement and sex ratios in a primitively social bee. Nature 331, 346–348 (1988). https://doi.org/10.1038/331346a0
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DOI: https://doi.org/10.1038/331346a0
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