School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
Biol Lett. 2018 Aug;14(8). doi: 10.1098/rsbl.2018.0442.
The sensitivity of metabolic rate to temperature constrains the climate in which ectotherms can function, yet the temperature dependence of metabolic rate may evolve in response to biotic and abiotic factors. We compiled a dataset on the temperature dependence of metabolic rate for heterotrophic ectotherms from studies that show a peak in metabolic rate at an optimal temperature (i.e. that describe the thermal performance curve for metabolic rate). We found that peak metabolic rates were lower in aquatic than terrestrial habitats and increased with body mass, latitude and the optimal temperature. In addition, the optimal temperature decreased with latitude. These results support competing hypotheses about metabolic rate adaptation, with hotter being better in the tropics but colder being better towards the poles. Moreover, our results suggest that the temperature dependence of metabolic rate is more complex than previously suggested.
代谢率对温度的敏感性限制了变温动物的生存气候，但代谢率的温度依赖性可能会因生物和非生物因素而发生进化。我们从研究中编译了一个关于异养变温动物代谢率对温度依赖性的数据集，这些研究显示代谢率在最佳温度下达到峰值（即描述代谢率的热性能曲线）。我们发现，在水生栖息地中，峰值代谢率低于陆地栖息地，并且随着体重、纬度和最佳温度的增加而增加。此外，最佳温度随纬度降低而降低。这些结果支持关于代谢率适应的竞争性假说，即在热带地区，温度越高越好，但在极地地区，温度越低越好。此外，我们的结果表明，代谢率的温度依赖性比以前认为的更为复杂。
