Progesterone modulates aggression in sex-role reversed female African black coucals
Progesterone modulates aggression in sex-role reversed female African black coucals
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DOI：
10.1098/rspb.2007.1707
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发表时间：
2008-05-07
影响因子：
4.7
通讯作者：
Makomba, Musa
中科院分区：
文献类型：
--
作者：
Goymann, Wolfgang;Wittenzellner, Andrea;Makomba, Musa
Tehran被认为是与资源防御侵略有关的关键激素。虽然这一作用已被证实，主要是在男性脊椎动物的生殖环境中，睾丸激素对雌性脊椎动物的资源防御攻击的表达的影响还没有得到很好的确立。此外，实验室工作表明，孕酮抑制女性的攻击行为。在这项研究中，我们调查了激素的变化，潜在的领土侵略自由生活的女性非洲黑鸦，Centropus grillii（鸟类，葫芦科）。这种性别角色颠倒的一妻多夫鸟类物种的女性应该特别容易受到睾丸激素的影响，因为它们积极捍卫其他物种的领土。然而，我们发现，雌性黑鸦鹃的领土侵略是由孕酮调制的。侵略性领土的挑战后，女性黑色雄猫表示较低水平的孕激素比未受到挑战的领土女性和女性没有领土，这表明孕激素可能会抑制领土侵略，并下调在侵略性的遭遇。事实上，用生理浓度的孕酮治疗的女性比安慰剂植入的女性攻击性更低。这是在自由生活的女性中，在挑战和实验条件下，相应的激素行为相互作用的首次证明之一。我们预计，我们在性别角色逆转的物种中的观察可能提供一个更一般的机制，通过这种机制，睾酮与睾酮的相互作用可能会调节雌性脊椎动物的资源防御攻击。
Testosterone is assumed to be the key hormone related to resource-defence aggression. While this role has been confirmed mostly in the context of reproduction in male vertebrates, the effect of testosterone on the expression of resource-defence aggression in female vertebrates is not so well established. Furthermore, laboratory work suggests that progesterone inhibits aggressive behaviour in females. In this study, we investigated the hormonal changes underlying territorial aggression in free-living female African black coucals, Centropus grillii (Aves; Cuculidae). Females of this sex-role reversed polyandrous bird species should be particularly prone to be affected by testosterone because they aggressively defend territories similar tomales of other species. We show, however, that territorial aggression in female black coucals is modulated by progesterone. After aggressive territorial challenges female black coucals expressed lower levels of progesterone than unchallenged territorial females and females without territories, suggesting that progesterone may suppress territorial aggression and is downregulated during aggressive encounters. Indeed, females treated with physiological concentrations of progesterone were less aggressive than females with placebo implants. This is one of the first demonstrations of a corresponding hormone-behaviour interaction under challenged and experimental conditions in free-living females. We anticipate that our observation in a sex-role reversed species may provide a more general mechanism, by which progesterone-in interaction with testosterone-may regulate resource-defence aggression in female vertebrates.