Abstract
DATA have recently been collected in Caithness and Shetland on the numbers of the different mating types, dark × dark, dark × pale and pale × pale, of the colour phases of the Arctic skua, Stercorarius parasiticus. Although on Fair Isle intermediates, very similar to darks, are recognized; in the remainder of these data, this distinction is not made: for this reason, the intermediates in the Fair Isle data have likewise been added to the darks.
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References
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Fisher, R. A., “The Genetical Theory of Natural Selection”, 1st and 2nd edit. (Oxford and New York, 1930 and 1958).
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O'DONALD, P. Possibility of Assortive Mating in the Arctic Skua. Nature 183, 1210–1211 (1959). https://doi.org/10.1038/1831210a0
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DOI: https://doi.org/10.1038/1831210a0
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