Independent and combined effects of daytime heat stress and night-time recovery determine thermal performance
Independent and combined effects of daytime heat stress and night-time recovery determine thermal performance
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DOI：
10.1242/bio.038141
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发表时间：
2019-03-01
期刊：
影响因子：
2.4
通讯作者：
Ma, Chun-Sen
中科院分区：
文献类型：
--
作者：
Bai, Chun-Ming;Ma, Gang;Ma, Chun-Sen
生物体在白天通常会经历不利的高温，但它们也可能在温度较温和的夜间恢复或修复自己。因此，每日温度波动的热效应可以分为两个相反的过程（即白天热应激的负面影响和夜间恢复的正面影响）。尽管最近的进展增加每日温度变化的后果，白天和夜间温度对生物体性能的独立和综合影响仍然不清楚。通过独立操纵每日最高和最低温度，我们测试了白天热应激和夜间恢复的变化如何影响瓢虫物种龟纹瓢虫的发育、存活和耐热性。热对发育和生存的影响在白天和夜间不同。白天高温有负面影响，而夜间温和的温度有积极的影响。白天热胁迫和夜间恢复的程度也影响了生长发育和临界最高热量，表明白天和夜间温度对热性能既有独立的影响，也有联合的影响。我们的研究结果提供了深入了解昼夜温度变化的热效应，并对预测气候变化下昼夜不对称变暖的影响具有重要意义。
Organisms often experience adverse high temperatures during the daytime, but they may also recover or repair themselves during the night-time when temperatures are more moderate. Thermal effects of daily fluctuating temperatures may thus be divided into two opposite processes (i.e. negative effects of daytime heat stress and positive effects of night-time recovery). Despite recent progress on the consequences of increased daily temperature variability, the independent and combined effects of daytime and night-time temperatures on organism performance remain unclear. By independently manipulating daily maximum and minimum temperatures, we tested how changes in daytime heat stress and night-time recovery affect development, survival and heat tolerance of the lady beetle species Propylea japonica. Thermal effects on development and survival differed between daytime and night-time. Daytime high temperatures had negative effects whereas night-time mild temperatures had positive effects. The extent of daytime heat stress and night-time recovery also affected development and critical thermal maximum, which indicates that there were both independent and combined effects of daytime and night-time temperatures on thermal performances. Our findings provide insight into the thermal effect of day-to-night temperature variability and have important implications for predicting the impacts of diel asymmetric warming under climate change.