Communal breeding by women is associated with lower investment from husbands.
Communal breeding by women is associated with lower investment from husbands.
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女性集体生育与丈夫的投资较少有关。
DOI：
10.1017/ehs.2022.47
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发表时间：
2022
影响因子：
2.6
通讯作者：
Ji, Ting
中科院分区：
文献类型：
--
作者：
He, Qiao-Qiao;Rui, Jun-Wen;Zhang, Li;Tao, Yi;Wu, Jia-Jia;Mace, Ruth;Ji, Ting
根据汉密尔顿的规则，母系偏见投资限制了母系社会中的男性最大化其包容性适应性（“母系之谜”）。最近的一项假设认为，当女性共同生育并分享家庭资源时，男性应该帮助姐妹的家庭，而不是妻子的家庭，因为对姐妹的投资而不是对妻子的投资会被其他不相关的成员稀释（Wu et al.,）。根据这一假设，当妻子的家庭中有更多的妇女生育时，男人不太可能帮助妻子的农场，因为平均而言，他与妻子的家庭的关系会减少。我们使用了在中国西南部母系摩梭人中收集的农场工作观测数据集来验证这一假设。正如预测的那样，妻子家庭中女性的集体繁殖水平高，确实预示着男性在妻子农场上花费的精力较少，而男性出生家庭的集体繁殖并不影响男性是否在他们出生的农场上帮忙。因此，女性的群体繁殖稀释了男性从对妻子和孩子的投资中获得的包容性健康收益，并可能推动男性对母系偏见投资的进化。这些结果有助于解决“母系之谜”。
According to Hamilton's rule, matrilineal-biased investment restrains men in matrilineal societies from maximising their inclusive fitness (the ‘matrilineal puzzle'). A recent hypothesis argues that when women breed communally and share household resources, a man should help his sisters' household, rather than his wife's household, as investment to the later but not the former would be diluted by other unrelated members (Wu et al.,). According to this hypothesis, a man is less likely to help on his wife's farm when there are more women reproducing in the wife's household, because on average he would be less related to his wife's household. We used a farm-work observational dataset, that we collected in the matrilineal Mosuo in southwest China, to test this hypothesis. As predicted, high levels of communal breeding by women in his wife's households do predict less effort spent by men on their wife's farm, and communal breeding in men's natal households do not affect whether men help on their natal farms. Thus, communal breeding by women dilutes the inclusive fitness benefits men receive from investment to their wife and children, and may drive the evolution of matrilineal-biased investment by men. These results can help solve the ‘matrilineal puzzle'.
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