Tanvez Aurélie, Béguin Nathalie, Chastel Olivier, Lacroix André, Leboucher Gérard
Laboratory of Ethology and Comparative Cognition, Université Paris 10-Nanterre, bâtiment H, 200 avenue de la République, 92001 Nanterre Cedex, France.
Gen Comp Endocrinol. 2004 Sep 1;138(2):113-20. doi: 10.1016/j.ygcen.2004.05.010.
The androgen concentration in birds' eggs varies with laying order, breeding conditions, and mate attractiveness. In passerine birds, mate attractiveness depends upon song quality. The aim of our study was to evaluate the effect of one criterion used by females to assess male song quality that is to say the presence of sexually attractive phrases on yolk androgen deposition. Twenty-five female Canaries were assigned to three experimental groups; in the first group, the females were allowed to hear songs made up with attractive phrases; in the second group, they were allowed to hear songs made up with non-attractive phrases; and in the control group, the females could not hear any song. Our results show that females allowed to hear songs with attractive phrases deposit significantly higher amounts of androgens (mostly testosterone) in their eggs than females without acoustical stimulation. The females exposed to songs with non-attractive phrases had androgen amounts halfway between the two other groups. This suggests that when females are paired with mates able to sing attractive phrases they can allocate more androgens in their eggs during the pre-laying period.
鸟类卵中的雄激素浓度会随着产卵顺序、繁殖条件和配偶吸引力而变化。在雀形目鸟类中，配偶吸引力取决于歌声质量。我们研究的目的是评估雌性用于评估雄性歌声质量的一个标准，即具有性吸引力的乐句的存在对卵黄雄激素沉积的影响。25只雌性金丝雀被分配到三个实验组；在第一组中，雌性被允许听到由有吸引力的乐句组成的歌曲；在第二组中，它们被允许听到由无吸引力的乐句组成的歌曲；在对照组中，雌性听不到任何歌曲。我们的结果表明，被允许听到有吸引力乐句歌曲的雌性在其卵中沉积的雄激素（主要是睾酮）量明显高于没有听觉刺激的雌性。暴露于无吸引力乐句歌曲的雌性的雄激素量处于另外两组之间。这表明，当雌性与能够唱出有吸引力乐句的配偶配对时，它们在产卵前阶段可以在卵中分配更多的雄激素。
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