Tolerance landscapes in thermal ecology
Tolerance landscapes in thermal ecology
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DOI：
10.1111/1365-2435.12268
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发表时间：
2014-08-01
影响因子：
5.2
通讯作者：
Santos, Mauro
中科院分区：
文献类型：
--
作者：
Rezende, Enrico L.;Castaneda, Luis E.;Santos, Mauro
1.如何将实验室中估计的热容忍度外推到自然环境中仍然是一个有争议的课题。在这里，我们认为，单一温度可以准确地描述容差上限或下限的一般前提是不正确的。生存概率由热应激的强度和持续时间决定，这些变量之间的关联可以通过热耐受景观来充分传达。利用这一框架，我们证明了生物体可耐受的温度范围预计会随着热挑战的持续时间而缩小。分析表明，在对急性和慢性暴露于热应激的耐受性之间存在权衡，温度均值或极端的变化可能导致截然不同的选择压力和随后的进化反应。在控制了热挑战的持续时间后，我们还发现了纬度对昆虫上致死温度的影响，这在以前的大范围比较分析中仍然没有注意到。最终，由于逻辑原因，生态文献中采用了临界热限，而在概念上，临界热限不足以描述热耐受。我们认为，耐温性景观为研究耐温性及其在生态环境中的潜在影响提供了一个更合适的框架。
1. How thermal tolerance estimated in the laboratory can be extrapolated to natural settings remains a contentious subject. Here, we argue that the general premise that a single temperature can accurately describe upper or lower tolerance limits is incorrect.2. Survival probability is determined by both the intensity and the duration of a thermal stress, and the association between these variables can be adequately conveyed by a thermal tolerance landscape. Employing this framework, we demonstrate that the temperature range that an organism can tolerate is expected to narrow down with the duration of the thermal challenge.3. Analyses suggest that a trade-off exists between tolerances to acute and chronic exposition to thermal stress, and that changes in temperature means or extremes may result in drastically different selective pressures and subsequent evolutionary responses.4. After controlling for the duration of the thermal challenge, we also uncover latitudinal effects on upper lethal temperatures in insects that remained unnoticed in previous broad-scale comparative analyses.5. Ultimately, critical thermal limits have been adopted in the ecological literature for logistic reasons and are inadequate descriptors of thermal tolerance on conceptual grounds. We consider that tolerance landscapes provide a more suitable framework to study temperature tolerance and its potential impact in ecological settings.