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Heat tolerance in ectotherms scales predictably with body size
Nature Climate Change ( IF 30.7 ) Pub Date : 2020-11-16 , DOI: 10.1038/s41558-020-00938-y
Ignacio Peralta-Maraver , Enrico L. Rezende

Recent studies suggest that animals are decreasing in size as a general response to global warming, for reasons that remain unclear. Here, by analysing ectotherm death time curves that take into consideration the intensity and duration of a thermal challenge, we show that heat tolerance varies predictably with size. Smaller animals can maintain higher body temperatures than larger ones during short periods, but cannot maintain higher body temperatures over long periods as their endurance declines more rapidly with time. Body size effects and adaptive variation in heat tolerance may have been obscured in the past by these unaccounted for temporal effects. With increasing size, thermal death occurs at relatively lower metabolic rates with respect to rest at a non-stressful temperature, which might partly explain the reported reductions in organism size with climate warming and shed light on the mechanisms that underlie scaling.



中文翻译:

等温线的耐热性可预测地随体重变化

最近的研究表明,由于尚不清楚的原因,作为对全球变暖的一般反应,动物的体型正在减小。在这里,通过分析考虑了热挑战的强度和持续时间的等温线死亡时间曲线,我们显示出耐热性可预测地随尺寸而变化。较小的动物可以在短期内保持较高的体温,但不能长期保持较高的体温,因为它们的耐力随时间下降得更快。过去,由于时间因素的影响,身体尺寸的影响和耐热性的适应性变化可能已被掩盖。随着大小的增加,相对于在非压力温度下的休息,热死亡以相对较低的代谢率发生,

更新日期:2020-11-16
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