Patterns of reproductive skew in the polygynandrous acorn woodpecker
Patterns of reproductive skew in the polygynandrous acorn woodpecker
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DOI：
10.1086/376888
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发表时间：
2003-09-01
影响因子：
2.9
通讯作者：
Koenig, WD
中科院分区：
文献类型：
--
作者：
Haydock, J;Koenig, WD
我们比较了观察到的水平的生殖偏斜的合作繁殖橡子啄木鸟（Melanerpes formicivorus）与预测的两种替代交易模型。“特许权”模型预测了亲子关系共享的程度，假设一个单一的主导是在完全控制繁殖。另外，“约束”模型预测生殖共享假设，占主导地位的控制，只有下属是否留在组中，但不控制其份额的繁殖。雄性之间的生殖偏差很高：平均而言，最成功的雄性繁殖的后代是下一个最成功的雄性的三倍多。与男性相比，女性平等地分享亲子关系，对扩散的限制更低，存活率更低，这与让步模型的预测一致。也预测的特许经营权模型，每年的变化，繁殖季节前的扩散机会呈正相关与偏斜。然而，与让步相反，但与约束模型一致，偏斜随着相关性而减小。因此，这两种模型都不能一致地预测该物种的生殖偏斜模式。我们认为，模型的生殖偏斜将需要包括潜在的育种者和配偶选择之间的竞争性相互作用，才能充分预测大多数脊椎动物社会的生殖分区模式。
We compared observed levels of reproductive skew in the cooperatively breeding acorn woodpecker (Melanerpes formicivorus) with those predicted by two alternative transactional models. "Concession" models predict the degree to which parentage is shared assuming that a single dominant is in complete control of reproduction. Alternatively, "restraint" models predict reproductive sharing assuming that the dominant controls only whether subordinates remain in the group but does not control its share of reproduction. Reproductive skew is high among males: on average, the most successful male sires more than three times as many offspring as the next most successful male. Females share parentage equally and have lower constraints on dispersal and lower survival rates compared with males, which is consistent with predictions from the concessions model. Also as predicted by the concessions model, yearly variation in opportunities for dispersal before the breeding season correlates positively with skew. However, in contrast to concessions but consistent with the restraint model, skew decreases with relatedness. Thus, neither model consistently predicts patterns of reproductive skew in this species. We suggest that models of reproductive skew will need to include competitive interactions among potential breeders and mate choice before they will adequately predict patterns of reproductive partitioning in most vertebrate societies.