Verschillen in gedrag tussen beide seksen van de zeekoet (Uria aalge (Pontopp.))
van der Steen, L.J. (1975). Verschillen in gedrag tussen beide seksen van de zeekoet (Uria aalge (Pontopp.)). NIOZ-rapport, 1975(12). Nederlands Instituut voor Onderzoek der Zee: Texel. 18, 15 pp.
Part of: NIOZ-rapport. Netherlands Institute for Sea Research (NIOZ): Den Burg. ISSN 0923-3210
Guillemots (Uria aalge do not show any external sexual dimorphism. In the present research in a colony of captive guillemots the differences in behaviour between male and female birds have been studied. The birds were sexed before with the aid of gaschromatographic analyses of blood plasma. The following differences in behaviour have been observed. -The male guillemots occupy the eventual nesting territory before the females. In the greeting ceremony the males show dominant agressive components in their behaviour, the females show submissive behaviour. -Generally speaking the male is the first bird to show courtship-display as an introduction to copulation. -The male is promiscuous, the female partner less so or not at all. In promiscuous situations a male guillemot tends to approach a female while showing agressive display, after which the male makes a special appeasement gesture: the "pole-attitude". -In conflicts between partners the female shows submissive behaviour.
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