High temperatures drive offspring mortality in a cooperatively breeding bird
High temperatures drive offspring mortality in a cooperatively breeding bird
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DOI：
10.1098/rspb.2020.1140
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发表时间：
2020-07-29
影响因子：
4.7
通讯作者：
Ridley, Amanda R.
中科院分区：
文献类型：
--
作者：
Bourne, Amanda R.;Cunningham, Susan J.;Ridley, Amanda R.
需要更好地了解生活史对当前环境变化的反应，以预测特定物种对花生性气候变化的反应。以前的研究表明，在社会团体中的合作可能会缓冲个人免受不可预测的气候的一些负面影响。我们使用一个15年的合作繁殖干旱地区鸟类的数据集，以检验(I)环境条件和群体规模是否与幼鸟在三个发育阶段(卵、雏鸟、雏鸟)的存活相关，以及(Ii)群体规模是否缓解了不利环境条件对幼鸟生存的影响。在发育早期暴露于高平均日最高温度(平均T-max)与幼鼠在所有三个发育阶段的存活率降低有关。当平均T-max和38℃时，所有群体规模的幼鼠都没有存活下来。鉴于气候变化的快速推进，高温下幼鸟的低存活率对鸟类群落的招募和种群持久性具有广泛的影响。高温对幼鸟存活的影响并没有受到群体规模的影响，这表明在一个群体中有更多的帮手不太可能缓冲受到影响的后代存活的影响，因为平均和最高温度随着快速的人为气候变化而上升。
An improved understanding of life-history responses to current environmental variability is required to predict species-specific responses to anthopogenic climate change. Previous research has suggested that cooperation in social groups may buffer individuals against some of the negative effects of unpredictable climates. We use a 15-year dataset on a cooperative breeding arid zone bird, the southern pied babbler Turdoides bicolor, to test (i) whether environmental conditions and group size correlate with survival of young during three development stages (egg, nestling, fledgling) and (ii) whether group size mitigates the impacts of adverse environmental conditions on survival of young. Exposure to high mean daily maximum temperatures (mean T-max) during early development was associated with reduced survival probabilities of young in all three development stages. No young survived when mean T-max > 38 degrees C, across all group sizes. Low survival of young at high temperatures has broad implications for recruitment and population persistence in avian communities given the rapid pace of advancing climate change. Impacts of high temperatures on survival of young were not moderated by group size, suggesting that the availability of more helpers in a group is unlikely to buffer against compromised offspring survival as average and maximum temperatures increase with rapid anthropogenic climate change.