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Black-Headed Gull or Black-Headed Girl? On the Advantage of Concealing Sex By Gulls and Other Colonial Birds

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Mechanisms for sex-recognition in the Black-headed Gull, Larus ridibundus, were analysed in order to understand the occurrence of homo-sexual male pairs among captive members of this species. No discontinuities between males and females could be detected in either external characteristics or behaviour. Although most individuals select a mate of the opposite sex, there is no evidence that individuals which do not belong to the same pair are able to determine each other's sex. The adaptiveness of concealing sex for colonial monogamous species is discussed. Its significance was tested in a group of captive gulls. Small female-like males appeared to be most successful in reproduction. The development of polygynous mating systems seems to be opposed by a preference of females for caring males.

Affiliations: 1: (Department of Zoology, University of Groningen, Postbox 14, 9750 AA Haren, The Netherlands

10.1163/002829685X00082
/content/journals/10.1163/002829685x00082
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/content/journals/10.1163/002829685x00082
1984-01-01
2016-12-09

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