Asymmetry of thermal sensitivity and the thermal risk of climate change
Asymmetry of thermal sensitivity and the thermal risk of climate change
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DOI：
10.1111/geb.13570
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发表时间：
2022-07-21
影响因子：
6.4
通讯作者：
Kingsolver, Joel G.
中科院分区：
文献类型：
--
作者：
Buckley, Lauren B.;Huey, Raymond B.;Kingsolver, Joel G.
了解和预测气候变化的生物后果需要考虑生物体相对于环境温度的热敏感性。一种常见的方法涉及“热安全裕度”（TSM），其通常被估计为生物体可以耐受的最高温度（临界热最大值，CTmax）与其经历的平均或最高环境温度之间的温差。然而，生物体在低于其CTmax的体温下面临热应力和性能损失，并且该损失的陡度随着热性能曲线（TPC）的不对称性而增加。位置全球。2015-2019年期间。主要类群研究蚂蚁、鱼类、昆虫、蜥蜴和浮游植物。方法：我们研究TPC不对称的变化和热应力的影响，384个种群，289个物种的分类群和指标，包括蚂蚁和蜥蜴的运动，鱼类生长，昆虫和浮游植物的健身。结果我们发现最适温度（T-opt，超过此温度性能下降）比CTmax更不稳定，导致种间不对称性的变化。重要的是，TPC不对称的程度随着T-opt的增加而增加。因此，即使在热环境中具有较高T（opt）s的人群可能比具有较低T（opt）s的人群更少经历高于最佳体温的体温，但他们在高体温下的表现下降更快。估计的年度累计下降的性能温度以上T-opt表明，TPC不对称性改变的发病率，在高体温的性能递减率和严重程度。主要结论具有相同TSM的物种可以经历不同的热风险，由于TPC不对称性的差异。与TSM相比，结合TPC形状的其他方面的热量更好地捕捉气候变化的热风险。
Aim Understanding and predicting the biological consequences of climate change requires considering the thermal sensitivity of organisms relative to environmental temperatures. One common approach involves 'thermal safety margins' (TSMs), which are generally estimated as the temperature differential between the highest temperature an organism can tolerate (critical thermal maximum, CTmax) and the mean or maximum environmental temperature it experiences. Yet, organisms face thermal stress and performance loss at body temperatures below their CTmax, and the steepness of that loss increases with the asymmetry of the thermal performance curve (TPC). Location Global. Time period 2015-2019. Major taxa studied Ants, fish, insects, lizards and phytoplankton. Methods We examine variability in TPC asymmetry and the implications for thermal stress for 384 populations from 289 species across taxa and for metrics including ant and lizard locomotion, fish growth, and insect and phytoplankton fitness. Results We find that the thermal optimum (T-opt, beyond which performance declines) is more labile than CTmax, inducing interspecific variation in asymmetry. Importantly, the degree of TPC asymmetry increases with T-opt. Thus, even though populations with higher T(opt)s in a hot environment might experience above-optimal body temperatures less often than do populations with lower T(opt)s, they nonetheless experience steeper declines in performance at high body temperatures. Estimates of the annual cumulative decline in performance for temperatures above T-opt suggest that TPC asymmetry alters the onset, rate and severity of performance decrement at high body temperatures. Main conclusions Species with the same TSMs can experience different thermal risk due to differences in TPC asymmetry. Metrics that incorporate additional aspects of TPC shape better capture the thermal risk of climate change than do TSMs.