Departamento de Ecología, Center of Applied Ecology and Sustainability (CAPES), Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 6513677, Chile.
Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 6513677, Chile.
Proc Biol Sci. 2020 Nov 11;287(1938):20202508. doi: 10.1098/rspb.2020.2508. Epub 2020 Nov 4.
Thermal performance curves have provided a common framework to study the impact of temperature in biological systems. However, few generalities have emerged to date. Here, we combine an experimental approach with theoretical analyses to demonstrate that performance curves are expected to vary predictably with the levels of biological organization. We measured rates of enzymatic reactions, organismal performance and population viability in acclimated to different thermal conditions and show that performance curves become narrower with thermal optima shifting towards lower temperatures at higher levels or organization. We then explain these results on theoretical grounds, showing that this pattern reflects the cumulative impact of asymmetric thermal effects that piles up with complexity. These results and the proposed framework are important to understand how organisms, populations and ecological communities might respond to changing thermal conditions.
热性能曲线为研究生物系统中温度的影响提供了一个通用框架。然而，迄今为止，很少有普遍性的结论出现。在这里，我们结合实验方法和理论分析，证明性能曲线有望随着生物组织层次的变化而可预测地变化。我们在不同的热条件下对酶反应、生物体表现和种群活力进行了测量，并表明随着热最佳值向较低温度移动，性能曲线变得更窄，在更高的组织层次上。然后，我们从理论上解释了这些结果，表明这种模式反映了随着复杂性的增加，不对称热效应的累积影响。这些结果和提出的框架对于理解生物体、种群和生态群落如何应对不断变化的热条件非常重要。
