IngentaConnect Is female promiscuity constrained by the presence of her social m...

Authors: Johnsen, Arild¹; Pärn, Henrik²; Fossøy, Frode³; Kleven, Oddmund³; Laskemoen, Terje³; Lifjeld, Jan³

Source: Behavioral Ecology and Sociobiology, Volume 62, Number 11, September 2008 , pp. 1761-1767(7)

Publisher: Springer

Abstract:

Extra-pair paternity is common in birds and much research has focussed on the selective advantage of extra-pair matings for both sexes. In contrast, little attention has been given to the fact that in most species the majority of offspring are sired by the social male. We investigated whether extra-pair matings of female bluethroats (Luscinia svecica) are constrained by the presence of the pair male, by detaining males in cages on their territories for one morning during the peak of female fertility. The proportion of offspring sired by extra-pair males was higher in broods where males had been detained (35%) than in control broods (16%), while the proportion of broods that had at least one extra-pair offspring did not differ significantly between experimental (65%) and control broods (44%). Within the experimental group, levels of extra-pair paternity were not related to the day of experiment in relation to start of egg laying, but males caught early in the morning lost more paternity than males caught later on. Our results show that pair males exert constraints on the frequency of extra-pair paternity by being present during the period of peak fertility, which could be a direct effect of their mate guarding effort and/or due to an advantage in sperm competition for pair males.

Keywords: Sperm competition; Mate guarding; Sexual conflict; Extra-pair paternity; Male detention

Document Type: Research article

DOI: 10.1007/s00265-008-0604-6

Affiliations: 1: National Centre for Biosystematics, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318, Oslo, Norway, Email: arild.johnsen@nhm.uio.no 2: Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway 3: National Centre for Biosystematics, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318, Oslo, Norway

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Is female promiscuity constrained by the presence of her social mate? An experiment with bluethroats Luscinia svecica