Disentangling climatic and nest predator impact on reproductive output reveals adverse high-temperature effects regardless of helper number in an arid-region cooperative bird,Ecology Letters

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Disentangling climatic and nest predator impact on reproductive output reveals adverse high-temperature effects regardless of helper number in an arid-region cooperative bird
Ecology Letters ( IF 7.6 ) Pub Date : 2021-11-17 , DOI: 10.1111/ele.13913
Pietro B D'Amelio _{1,

2} , André C Ferreira _{2,

3,

4} , Rita Fortuna _{3,

4,

5} , Matthieu Paquet ₆ , Liliana R Silva _{3,

4} , Franck Theron _{2,

3,

4} , Claire Doutrelant _{1,

2} , Rita Covas _{1,

3,

4}

Affiliation

Climate exerts a major influence on reproductive processes, and an understanding of the mechanisms involved and which factors might mitigate adverse weather is fundamental under the ongoing climate change. Here, we study how weather and nest predation influence reproductive output in a social species, and examine whether larger group sizes can mitigate the adverse effects of these factors. We used a 7-year nest predator-exclusion experiment on an arid-region cooperatively breeding bird, the sociable weaver. We found that dry and, especially, hot weather were major drivers of nestling mortality through their influence on nest predation. However, when we experimentally excluded nest predators, these conditions were still strongly associated with nestling mortality. Group size was unimportant against nest predation and, although positively associated with reproductive success, it did not mitigate the effects of adverse weather. Hence, cooperative breeding might have a limited capacity to mitigate extreme weather effects.

中文翻译：

解开气候和巢穴捕食者对生殖产量的影响揭示了不利的高温效应，无论干旱地区合作鸟类的助手数量如何

气候对生殖过程产生重大影响，了解所涉及的机制以及哪些因素可以缓解不利天气是当前气候变化的基础。在这里，我们研究了天气和巢穴捕食如何影响社会物种的繁殖产量，并检查更大的群体规模是否可以减轻这些因素的不利影响。我们对干旱地区合作繁殖的鸟类——善于交际的织布工进行了为期 7 年的巢穴捕食者排斥实验。我们发现干燥，尤其是炎热的天气通过影响巢穴捕食是雏鸟死亡率的主要驱动因素。然而，当我们通过实验排除巢穴捕食者时，这些条件仍然与雏鸟死亡率密切相关。群体规模对于巢穴捕食并不重要，而且，尽管与繁殖成功呈正相关，但它并没有减轻恶劣天气的影响。因此，合作育种在减轻极端天气影响方面的能力可能有限。

更新日期：2021-12-10

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