Sex,cannibalism and sticklebacks |
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| Authors: | F G Whoriskey G J FitzGerald |
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| Institution: | (1) Départment de Biologie, Université Laval, G1K 7P4 Ste-Foy, Québec, Canada;(2) Present address: Department of Zoology, University College of Wales, SY23 3DA Aberystwyth, Dyfed, Wales, Great Britain |
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| Abstract: | Summary Two closely related species of sticklebacks (Pisces:Gasterosteidae), breeding in the same site at the same time, showed different patterns of egg cannibalism. In Gasterosteus aculeatus the intensity of cannibalism was density-dependent and females were the most important cannibals. In G. wheatlandi cannibalism was not density-dependent and males ate more eggs than females. This study indicates that sex-specific patterns of cannibalism can differ widely between species despite their similar ecology, and it provides evidence inconsistent with a currently popular explanation for egg cannibalism. |
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