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Community-wide seasonal shifts in thermal tolerances of mosquitoes
Ecology ( IF 4.8 ) Pub Date : 2021-04-18 , DOI: 10.1002/ecy.3368
Brunno F Oliveira 1, 2 , Wendtwoin I G Yogo 1, 3 , Daniel A Hahn 4 , Jiang Yongxing 5 , Brett R Scheffers 1
Affiliation  

The broadening in species’ thermal tolerance limits and breadth from tropical to temperate latitudes is proposed to reflect spatial gradients in temperature seasonality, but the importance of seasonal shifts in thermal tolerances within and across locations is much less appreciated. We performed thermal assays to examine the maximum and minimum critical temperatures (CTmax and CTmin, respectively) of a mosquito community across their active seasons. Mosquito CTmin tracked seasonal shifts in temperature, whereas CTmax tracked a countergradient pattern with lowest heat tolerances in summer. Mosquito thermal breadth decreased from spring to summer and then increased from summer to autumn. We show a temporal dichotomy in thermal tolerances with thermal breadths of temperate organisms in summer reflecting those of the tropics (“tropicalization”) that is sandwiched between a spring and autumn “temperatization.” Therefore, our tolerance patterns at a single temperate latitude recapitulate classical patterns across latitude. These findings highlight the need to understand the temporal and spatial components of thermotolerance variation better, including plasticity and rapid seasonal selection, and the potential for this variation to affect species responses to climate change. With summers becoming longer and increasing winter nighttime temperatures, we expect increasing tropicalization of species thermal tolerances in both space and time.

中文翻译:

社区范围内蚊子耐热性的季节性变化

提议扩大物种的热耐受极限和从热带到温带纬度的广度,以反映温度季节性的空间梯度,但很少有人认识到位置内和位置之间热耐受季节性变化的重要性。我们进行了热分析,以检查蚊子群落活跃季节的最高和最低临界温度(分别为CT max和 CT min)。蚊子 CT最小值跟踪温度的季节性变化,而 CT最大值跟踪了夏季耐热性最低的逆梯度模式。蚊子的热广度从春季到夏季减小,然后从夏季到秋季增加。我们展示了热耐受性的时间二分法,夏季温带生物的热宽度反映了夹在春季和秋季“温带化”之间的热带(“热带化”)。因此,我们在单一温带纬度的容忍模式概括了跨纬度的经典模式。这些发现强调需要更好地了解耐热性变化的时间和空间组成部分,包括可塑性和快速的季节性选择,以及这种变化影响物种对气候变化反应的潜力。随着夏季变长和冬季夜间温度升高,
更新日期:2021-04-18
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