Hormonal and behavioural responses to simulated territorial intrusion in the cooperatively breeding white-browed sparrow weaver, Plocepasser mahali
Hormonal and behavioural responses to simulated territorial intrusion in the cooperatively breeding white-browed sparrow weaver, Plocepasser mahali
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合作繁殖的白眉麻雀织雀 Plocepasser mahali 对模拟领地入侵的激素和行为反应
DOI：
10.1006/anbe.1993.1001
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发表时间：
1993
期刊：
影响因子：
2.5
通讯作者：
D. Lewis
中科院分区：
文献类型：
--
作者：
J. Wingfield;D. Lewis
抽象抽象。对稳定的白眉麻雀编织者群体的行为调查表明，它们不仅合作繁殖，而且还保卫着来自其他群体的领土。领土防御包括定期巡逻边界，以及由所有小组成员齐声合唱。歌声只由繁殖的雄鸟表演，而且只在繁殖季节进行。地域合唱是由团体的所有成员在所有季节进行的，也可以由所有成员发起，尽管繁殖的男性和女性发起的合唱比助手更多。模拟的领土入侵(通过将一个被关在笼子里的团体放在一个领土内，并通过旁边放置的扬声器播放录制的合唱)导致该团体所有成员的领土侵略行为急剧增加。育种鸟或饲养员的干预不会影响血浆中的睾酮水平。然而，在攻击后，繁殖雌性动物的血浆促黄体激素水平显著升高。这些数据与该物种的其他观察结果一致，即领土攻击与循环中的睾酮无关，但与促黄体激素有关。对照组的皮质酮水平高于暴露在模拟领土入侵中的鸟类，但繁殖的雌性鸟类除外。尽管后一个结果的意义尚不清楚，但似乎对非繁殖者的“心理阉割”并不是通过循环中糖皮质激素水平的升高来调节的。
Abstract Abstract. Behavioural investigations of stable groups of white-browed sparrow weavers indicate that they not only bred cooperatively, but also defended territories from other groups. Territory defence involved regular patrolling of boundaries plus a characteristic chorus vocalization that was given by all group members in concert. Song was performed exclusively by the breeding male and only during the breeding season. Territorial choruses were given by all members of the group at all seasons and could also be initiated by all members, although the breeding male and female initiated more choruses than helpers. Simulated territorial intrusions (achieved by placing a caged group within a territory and playing back tape-recorded choruses through a speaker placed alongside) resulted in dramatic increases in territorial aggression by all group members. Plasma levels of testosterone were not affected by the intrusions in breeding birds or helpers. However, plasma levels of luteinizing hormone were significantly elevated in the breeding females after challenge. These data are consistent with other observations in this species that territorial aggression is independent of circulating testosterone, but is correlated with luteinizing hormone. Corticosterone levels were higher in controls than in birds exposed to simulated territorial intrusions with the exception of breeding females. Although the significance of this latter result is unclear, it does seem likely that 'psychological castration' of non-breeders is not mediated through elevated circulating levels of glucocorticosteroids.