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首页> 外文期刊>The Journal of Experimental Biology >Upper lethal temperatures in three cold-tolerant insects are higher in winter than in summer
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Upper lethal temperatures in three cold-tolerant insects are higher in winter than in summer

机译：在冬天的冬季含有三种耐冷昆虫的上部致死气温较高

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摘要

Upper lethal temperatures (ULTs) of cold-adapted insect species in winter have not been previously examined. We anticipated that as the lower lethal temperatures (LLTs) decreased (by 20-30 degrees C) with the onset of winter, the ULTs would also decrease accordingly. Consequently, given the recent increases in winter freeze-thaw cycles and warmer winters due to climate change, it became of interest to determine whether ambient temperatures during thaws were approaching ULTs during the cold seasons. However, beetle Dendroides canadensis (Coleoptera: Pyrochroidae) larvae had higher 24 and 48 h ULT50 (the temperature at which 50% mortality occurred) in winter than in summer. The 24 and 48 h ULT50 for D. canadensis in winter were 40.9 and 38.7 degrees C, respectively. For D. canadensis in summer, the 24 and 48 h ULT50 were 36.7 and 36.4 degrees C. During the transition periods of spring and autumn, the 24 h ULT50 was 37.3 and 38.5 degrees C, respectively. While D. canadensis in winter had a 24 h LT50 range between LLT and ULT of 64 degrees C, the summer range was only 41 degrees C. Additionally, larvae of the beetle Cucujus clavipes clavipes (Coleoptera: Cucujidae) and the cranefly Tipula trivittata (Diptera: Tipulidae) also had higher ULTs in winter than in summer. This unexpected phenomenon of increased temperature survivorship at both lower and higher temperatures in the winter compared with that in the summer has not been previously documented. With the decreased high temperature tolerance as the season progresses from winter to summer, it was observed that environmental temperatures are closest to upper lethal temperatures in spring.
机译：冬天冷适应昆虫物种的最高致死温度（ULTS）以前未被检查。我们预计，作为下致死温度（LLTs）下降（20-30摄氏度）随着冬季的来临，在ULTS也将相应减少。因此，鉴于最近在冬季冻融循环和气候变化造成的暖冬的增加，它成为利益来确定解冻过程中的环境温度是否在寒冷的季节快到ULTS。然而，甲虫Dendroides飞蓬（鞘翅目：Pyrochroidae）幼虫在冬季具有较高的24和48小时ULT50（在其中发生50％的死亡率的温度）比夏季。在24和48小时对于ULT50 D.飞蓬在冬天为40.9和38.7℃，分别。为D.在夏季飞蓬，在24和48小时ULT50分别为36.7和36.4℃。在春季和秋季的过渡时期，24小时ULT50为37.3和38.5℃，分别。而D.在冬季飞蓬有LLT和64度ULT℃之间的24小时范围LT50，夏季范围仅为41℃。此外，甲虫Cucujus clavipes clavipes的幼虫（鞘翅目：Cucujidae）和cranefly蒂普洛trivittata（双翅目：Tipulidae）也有冬季高出ULTS比夏季。在冬季较低和较高温度下，在夏天以前没有被记录相比，温度升高生存的这种意想不到的现象。随着高温耐受性从冬到夏下降随着赛季的进行，有人指出，环境温度最接近最高致死温度在春季。

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