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Predation risk constrains herbivores' adaptive capacity to warming.
Nature Ecology & Evolution ( IF 16.8 ) Pub Date : 2020-06-01 , DOI: 10.1038/s41559-020-1218-2
Michiel P Veldhuis 1, 2, 3 , Tim R Hofmeester 4 , Guy Balme 5, 6 , Dave J Druce 7, 8 , Ross T Pitman 5, 6 , Joris P G M Cromsigt 4, 9, 10
Affiliation  

Global warming compels larger endothermic animals to adapt either physiologically or behaviourally to avoid thermal stress, especially in tropical ecosystems. Their adaptive responses may however be compromised by other constraints, such as predation risk or starvation. Using an exceptional camera-trap dataset spanning 32 protected areas across southern Africa, we find that intermediate-sized herbivores (100–550 kg) switch activity to hotter times of the day when exposed to predation by lions. These herbivores face a tight window for foraging activity being exposed to nocturnal predation and to heat during the day, suggesting a trade-off between predation risk and thermoregulation mediated by body size. These findings stress the importance of incorporating trophic interactions into climate change predictions.



中文翻译:

捕食风险限制了食草动物对变暖的适应能力。

全球变暖迫使较大的吸热动物适应生理或行为,避免热应激,特别是在热带生态系统中。然而,它们的适应性反应可能会受到其他限制因素的影响,例如掠食风险或饥饿。使用横跨非洲南部32个保护区的特殊相机陷阱数据集,我们发现,中型草食动物(100-550千克)在被狮子捕食时会将活动切换到一天中的更热时间。这些草食动物在白天的夜间捕食和高温下面临着觅食活动的严密窗口,这表明在捕食风险和体型介导的体温调节之间要进行权衡。这些发现强调了将营养相互作用纳入气候变化预测的重要性。

更新日期:2020-06-01
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