Inbreeding depresses altruism in a cooperative society.,Ecology Letters

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Inbreeding depresses altruism in a cooperative society.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-08-11 , DOI: 10.1111/ele.13578
David A Wells _{1,

2} , Michael A Cant ₃ , Joseph I Hoffman _{1,

4} , Hazel J Nichols _{1,

5}

Affiliation

In some animal species, individuals regularly breed with relatives, including siblings and parents. Given the high fitness costs of inbreeding, evolutionary biologists have found it challenging to understand the persistence of these inbred societies in nature. One appealing but untested explanation is that early life care may create a benign environment that offsets inbreeding depression, allowing inbred societies to evolve. We test this possibility using 21 years of data from a wild cooperatively breeding mammal, the banded mongoose, a species where almost one in ten young result from close inbreeding. We show that care provided by parents and alloparents mitigates inbreeding depression for early survival. However, as adults, inbred individuals provide less care, reducing the amount of help available to the next generation. Our results suggest that inbred cooperative societies are rare in nature partly because the protective care that enables elevated levels of inbreeding can be reduced by inbreeding depression.

中文翻译：

近交会抑制合作社中的利他主义。

在某些动物物种中，个体经常与亲戚（包括兄弟姐妹和父母）一起繁殖。鉴于近交的适应性成本高昂，进化生物学家发现了解这些近交社会在自然界中的持久性具有挑战性。一种吸引人但未经检验的解释是，早期生命护理可能会创造一个良性环境，以抵消近亲抑郁症，使近交社会得以发展。我们使用来自野生合作繁殖的哺乳动物（带状猫鼬）的21年数据测试了这种可能性，该物种是近距离繁殖的十分之一的年轻人。我们表明，父母和同父异母父母提供的护理减轻了近亲抑郁症的早期生存。但是，作为成年人，近交个体提供的照顾较少，从而减少了对下一代的帮助。

更新日期：2020-09-24

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