Offspring fertility and grandchild survival enhanced by maternal grandmothers in a pre-industrial human society.
Offspring fertility and grandchild survival enhanced by maternal grandmothers in a pre-industrial human society.
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DOI：
10.1038/s41598-021-83353-3
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发表时间：
2021-02-11
影响因子：
4.6
通讯作者：
Lummaa V
中科院分区：
文献类型：
--
作者：
Chapman SN;Lahdenperä M;Pettay JE;Lynch RF;Lummaa V
在许多合作物种中，帮助是直接针对亲属的，但其性质和强度会因环境而异。人类是为数不多的祖母在孙辈身上投资的物种之一，这可能是我们不同寻常的生命史的重要驱动力。但是，帮助行为几乎是不一致的，要想深入了解祖母在人类进化中的重要性，需要理解帮助利益的语境表达。在这里，我们使用来自芬兰的18 - 19世纪工业化前的家谱数据集来调查母系或父系外祖母的存在（相对于焦点个体的谱系）是否对后代的两个关键适应性结果：生育能力和生存能力产生不同的影响。我们发现祖母的存在缩短了生育间隔，特别是在母亲年龄较小和出生顺序较早的情况下。外祖母的存在增加了局灶性孙子存活的可能性，无论祖母是通过女儿、儿子还是两者都有孙子。相比之下，祖母的存在与后代的生育能力或存活率无关。我们根据谱系差异在帮助结果方面的当前假设来讨论这些结果。
Help is directed towards kin in many cooperative species, but its nature and intensity can vary by context. Humans are one of few species in which grandmothers invest in grandchildren, and this may have served as an important driver of our unusual life history. But helping behaviour is hardly uniform, and insight into the importance of grandmothering in human evolution depends on understanding the contextual expression of helping benefits. Here, we use an eighteenth-nineteenth century pre-industrial genealogical dataset from Finland to investigate whether maternal or paternal grandmother presence (lineage relative to focal individuals) differentially affects two key fitness outcomes of descendants: fertility and survival. We found grandmother presence shortened spacing between births, particularly at younger mother ages and earlier birth orders. Maternal grandmother presence increased the likelihood of focal grandchild survival, regardless of whether grandmothers had grandchildren only through daughters, sons, or both. In contrast, paternal grandmother presence was not associated with descendants’ fertility or survival. We discuss these results in terms of current hypotheses for lineage differences in helping outcomes.
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影响因子：
2.6
作者：
Ellis S;Franks DW;Nattrass S;Cant MA;Bradley DL;Giles D;Balcomb KC;Croft DP
通讯作者：
Croft DP
影响因子：
2.5
作者：
Du, Bo;Guan, Meng-Meng;Chen, Guo-Liang
通讯作者：
Chen, Guo-Liang
影响因子：
2
作者：
HAMILTON, WD
通讯作者：
HAMILTON, WD
影响因子：
5.1
作者：
Chrastil, Elizabeth R.;Getz, Wayne M.;Starks, Philip T.
通讯作者：
Starks, Philip T.
影响因子：
2.4
作者：
Allainé, D;Theuriau, F
通讯作者：
Theuriau, F