Coalitions of relatives and reproductive skew in cooperatively breeding white-winged choughs
Coalitions of relatives and reproductive skew in cooperatively breeding white-winged choughs
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DOI：
10.1098/rspb.2000.0993
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发表时间：
2000-02-07
影响因子：
4.7
通讯作者：
Double, M
中科院分区：
文献类型：
--
作者：
Heinsohn, R;Dunn, P;Double, M
我们使用DNA指纹技术来检查合作繁育的白翼海鸡Corcorax Blackorhamphos的生殖扭曲情况，这种白翼海鸡生活在多达20只个体的群体中。在严重干旱之前，稳定了多年的群体的特点是长期一夫一妻制，只有一对繁殖后代(高度倾斜)。干旱过后，由多个个体和亲属联盟合并而成的新群体。每个派别最多有一名成员成功繁殖，这样的倾斜取决于不相关派别的数量，而不是群体规模。在新的群体中，占主导地位的男性和女性以及有支持的亲属总是成功的。虽然大多数没有家庭支持的女性也获得了生育地位，但许多没有家庭支持的男性无法生育。因此，下属通过首先帮助近亲雄性获得繁殖地位，然后帮助抚养他们的后代，从而获得间接的适应能力。我们的研究证明了联合行动的优势，并表明获得未来的盟友可能是帮助该物种行为的主要好处。
We used DNA finger printing to examine reproductive skew in cooperatively breeding white-winged choughs, Corcorax melanorhamphos, which live in groups of up to 20 individuals. Before a severe drought, groups that had been stable for multiple years were characterized by long-term monogamy involving a single breeding pair (high skew). After the drought, new groups formed from the amalgamation of multiple individuals and coalitions of relatives. At most one member of each faction succeeded in breeding, such that skew was dependent on the number of unrelated factions, and not group size. In the new groups, dominant males and females with supporting relatives were always successful. Whereas most females without support also gained breeding positions, many males without family support failed to breed. Thus subordinates gain indirect fitness by first helping related males to secure a breeding position, and then helping to raise their young. Our study demonstrates the advantage of operating in coalitions, and suggests that the acquisition of future allies may be a major benefit of helping behaviour in this species.