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• W2078309963 abstract "Black-headed gulls, Larus ridibundus, produce clutches of three eggs, which contain high levels of maternal androgens in the yolk. These levels increase with laying order and the eggs hatch asynchronously. Experiments have supported the hypothesis that this within-clutch variation in maternal androgens mitigates the disadvantage of last-hatched chicks in sibling competition, by enhancing embryonic development and early posthatching growth. We hypothesized that these effects come about by the stimulating effects of maternal androgens on begging behaviour and competitive ability. In the field, we injected first-laid eggs of a clutch (which have a low androgen level) with either an androgen solution (T eggs) or vehicle (Oil eggs). We then created pairs of chicks hatched from Oil and T eggs, matched for egg mass and hatching date. Parent–chick interactions were recorded from observation hides. Chicks from T eggs hatched almost half a day sooner than those from Oil eggs. Furthermore, chicks from T eggs were more active during the first week after hatching, were more often the first to react to the approaching parent, begged more frequently, and obtained the larger share of food. We conclude that the enhancing effect of yolk androgens on growth in this species arises at least partly through androgen-mediated effects on the chicks' behaviour. Copyright 2003 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved." @default.
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• W2078309963 date "2003-12-01" @default.
• W2078309963 modified "2023-10-16" @default.
• W2078309963 title "Yolk androgens and begging behaviour in black-headed gull chicks: an experimental field study" @default.
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• W2078309963 doi "https://doi.org/10.1006/anbe.2003.2287" @default.
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