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达马拉兰鼠不依赖助手进行繁殖或生存

Jack Thorley^1,2, Hanna M Bensch^2,3, Kyle Finn^2,4

¹Department of Zoology, University of Cambridge, Cambridge, United Kingdom.

Evolution letters

|July 21, 2023

概括

在达马拉兰的鼠中,合作繁殖是不强制性的. 伴侣可以在没有非繁殖助手的情况下成功繁殖,这挑战了以前关于脊椎动物社会性的假设.

科学领域:

* 行为生态学
* 进化生物学进化生物学
*哺乳动物社会系统

背景情况:

*无脊椎动物和一些脊椎动物中常见的是共生性和合作繁殖,其中非繁殖者协助繁殖的个体.
* 达马拉兰鼠 (Fukomys damarensis) 经常被引用作为脊椎动物社会性的例子,但对助手的生殖必要性仍在争论中.
*以前的研究表明,它们的社会结构与欧社会昆虫的社会结构非常相似.

研究的目的:

* 调查繁殖达马拉兰鼠从非繁殖群成员中获益的程度.
* 确定合作繁殖是否是该物种的强制性策略.
* 评估群体大小对生殖成功和个体生存的影响.

主要方法:

*对野生达马拉兰鼠的实地观测,重点关注潜在繁殖者的分散和定居模式.
*监测孤独雌性动物的生存率和身体状况.
*对群体大小进行实验操纵,以比较繁殖成功和幼招募率,对比较大的群体.

主要成果:

* 未来的雌性繁殖者通常会分散并建立单独的洞穴,在配对之前长时间生存.
* 没有助手成功繁殖的对,繁殖成功与较大的群体相美.
*成年人生存率与群体大小无关,而幼招募和非繁殖者生长显示出对群体大小的混合反应.

结论:

* 在达马拉兰鼠中,合作繁殖是不必要的;对经常在没有帮助的情况下繁殖.
*生态因素可能会推动分散和群体形成,而不是对合作繁殖的强制性需求.
* 群体生活的进化可能涉及合作的间接收益比此前对该物种的假设要少.

关键词:

合作繁殖的合作繁殖家庭生活家庭生活辅助效应是一种辅助效应.作为一个哲学家.社会性社交性社交性

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