Summary
Data of the breeding of pale, intermediate and dark phenotypes in a population of Arctic Skuas are analysed and fitted to models of sexual selection. In the model which fits best, groups of females become ready to breed during successive intervals in the breeding season. Females with preferences mate first, some preferring the dark males and others the intermediates; the remaining females then mate at random. At maximum likelihood, 14 per cent of females prefer dark males and 29 per cent prefer intermediate males. The likelihood surfaces of the models are illustrated with respect to the parameters of the mating preferences. An analysis of X2 shows that after fitting the mating preferences and allowing for variation in breeding times, no heterogeneity is left in the data. Observations of assortative mating and the behaviour during pairing also support the model. The female preferences can be explained as the result of different thresholds in the females' responses. These may have evolved in earlier, warmer periods when dark and intermediate phenotypes must have had an overall advantage.
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Davis, J W F, and O'Donald, D P. 1976. Estimation of assortative mating preferences in the Arctic Skua. Heredity, 36, 235–244.
Edwards, A W F. 1972. Likelihood. The University Press, Cambridge.
Fisher, R A. 1930. The Genetical Theory of Natural Selection. The Clarendon Press, Oxford.
O'Donald, P. 1967. A general model of sexual and natural selection. Heredity, 22, 499–518.
O'Donald, P. 1974. Polymorphisms maintained by sexual selection in monogamous species of birds. Heredity. 32, 1–10.
O'Donald, P. 1976a. Mating preferences and their genetic effects in models of sexual selection for colour phases of the Arctic Skua. Population Genetics and Ecology, ed. S. Karlin and E. Nevo, pp. 411–430. Academic Press, New York.
O'Donald, P. 1976b. Mating Preferences And Sexual Selection In The Arctic Skua. II. Behavioural Mechanisms Of The Mating Preferences. Heredity, 39, 111–119.
O'Donald, P, and Davis, J W F. 1976. A demographic analysis of the components of selection in a population of Arctic Skuas. Heredity, 36, 343–350.
O'Donald, P, Davis, J W F, and Broad, R A. 1974. Variation in assortative mating in two colonies of Arctic Skuas. Nature, 252, 700–701.
O'Donald, P, Wedd, N S, and Davis, J W F. 1974. Mating preferences and sexual selection in the Arctic Skua. Heredity, 33, 1–16.
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O'Donald, P., Davis, J. Mating preferences and sexual selection in the Arctic Skua. Heredity 39, 121–132 (1977). https://doi.org/10.1038/hdy.1977.48
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DOI: https://doi.org/10.1038/hdy.1977.48
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