Infant survival in western lowland gorillas after voluntary dispersal by pregnant females.
Infant survival in western lowland gorillas after voluntary dispersal by pregnant females.
复制标题
DOI：
10.1007/s10329-020-00844-z
复制
发表时间：
2020-11
期刊：
影响因子：
--
通讯作者：
Robbins MM
中科院分区：
文献类型：
--
作者：
Manguette ML;Breuer T;Robeyst J;Kandza VH;Robbins MM
在许多社会性物种中，当雄性首领被取代或群体解体后，雌性的婴儿就有被雄性杀死的危险。雌性大猩猩已经发展出了罕见的二次扩散策略，即在断奶和怀孕之间的有限时间内，它们在生殖群体之间转移（自愿扩散）。通过这样做，他们离开了一个较弱的银背接近他的任期结束，并加入了一个较强的银背在他自己的任期的早期阶段，从而减少了风险，如果前者死亡。如果雌性怀孕或有未断奶的后代时，唯一的男性在组中死亡，他们的后代很容易被新的银背杀死，他们加入（通过非自愿分散）。在少数已知的雌性大猩猩怀孕时（主要是在群体解体后）转移的案例中，它们的后代被杀死。我们在这里报告了三只成年雌性在怀孕期间自愿在两组之间转移多次，但它们的后代没有被新组的银背杀死。这些大猩猩于1995年至2015年在刚果共和国北方的姆贝利巴伊研究基地被观察到。雌性动物在最后一次转移后5-6个月（妊娠期8.5个月）分娩。据我们所知，这些观察结果首次表明，野生雌性西部低地大猩猩在怀孕期间可以自愿转移，而不会被新的银背大猩猩杀死。这些观察结果突出了雌性大猩猩在应对雄性性胁迫时所表现出的行为可塑性。本文的在线版本（10.1007/s10329-020-00844-z）包含补充材料，可供授权用户使用。
In many social species, after the alpha male has been replaced or the group disintegrates, a female’s infant is at risk of infanticide by a male. Female gorillas have developed the rare strategy of secondary dispersal in which they transfer between reproductive groups during the limited time period between weaning an infant and conceiving the next one (voluntary dispersal). By doing so they leave a weaker silverback near the end of his tenure and join a stronger silverback at an earlier stage of his own tenure, thereby mitigating the risk of infanticide if the former dies. If females are pregnant or have unweaned offspring when the only male in the group dies, their offspring are vulnerable to infanticide by the new silverback that they join (via involuntary dispersal). In the few known cases of female gorillas transferring when pregnant (mainly after group disintegration), their offspring were killed. We report here on three adult females that transferred voluntarily while pregnant multiple times between two groups yet their offspring were not killed by the new group’s silverback. The gorillas were observed from 1995 to 2015 at the Mbeli Bai research site in northern Republic of the Congo. The females gave birth 5–6 months (gestation period 8.5 months) after their last transfer. To our knowledge, these observations are the first to show that wild female western lowland gorillas can transfer voluntarily while pregnant without incurring infanticide by a new silverback. These observations highlight the behavioural plasticity shown by female gorillas in response to sexual coercion by males. The online version of this article (10.1007/s10329-020-00844-z) contains supplementary material, which is available to authorized users.
登录
查看更多内容
影响因子：
56.9
作者：
Roberts, Eila K.;Lu, Amy;Beehner, Jacinta C.
通讯作者：
Beehner, Jacinta C.
影响因子：
3.8
作者：
Greeff, J. M.;Erasmus, J. C.
通讯作者：
Erasmus, J. C.
影响因子：
2.4
作者：
Parnell, RJ
通讯作者：
Parnell, RJ
影响因子：
2.4
作者：
SICOTTE, P
通讯作者：
SICOTTE, P
DOI：
10.1098/rspb.2006.3723
发表时间：
2007-01-22
影响因子：
4.7
作者：
Isvaran, Kavita;Clutton-Brock, Tim
通讯作者：
Clutton-Brock, Tim