The effects of acclimation and rates of temperature change on critical thermal limits in Tenebrio molitor (Tenebrionidae) and Cyrtobagous salviniae (Curculionidae)
The effects of acclimation and rates of temperature change on critical thermal limits in Tenebrio molitor (Tenebrionidae) and Cyrtobagous salviniae (Curculionidae)
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DOI：
10.1016/j.jinsphys.2012.01.016
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发表时间：
2012-05-01
影响因子：
2.2
通讯作者：
Chown, Steven L.
中科院分区：
文献类型：
--
作者：
Allen, Jessica L.;Clusella-Trullas, Susana;Chown, Steven L.
临界热极限提供了生物体可能生存的温度范围的指示，这些极限的不稳定性程度提供了对热环境变化对这种生存的可能影响的见解。但是，对这些限度的调查可能受到进行审判的情况的影响。只有少数研究考察了这些影响，而且通常不是针对甲虫的。在驯化及其逆转的时间过程中也没有考虑到这一群体，这两者对于估计物种对瞬态温度变化的响应都很重要。因此，我们研究了温度变化速率对黄粉虫（tenbrio molitor）和Cyrtobagous salviniae两种甲虫的临界热最大值（CTmax）和最小值（CTmin）的影响，以及驯化响应的时间过程及其逆转。温度变化速率的增加对大鼠和鼠尾草有相反的影响。在T. molitor中，更快的变化速率降低了CTmax （c. 2℃）和CTmin （c. 3℃），而在c. salviniae中，更快的变化速率增加了CTmax （c. 6℃）和CTmin （c. 4℃）。T. molitor的CTmax对驯化反应不明显，而CTmin的驯化反应在35℃（25℃起）后最明显，并在24 h内完成。36℃（26℃起）时，木苁茸CTmax的驯化时间为2天，18℃时，CTmin的驯化时间不到3天。15℃和35℃75% RH处理后再驯化至25℃的时间比驯化时间长，且CTmax为3 ~ 6 d， CTmin为6 d。在丹参中，CTmax和CTmin变化不大。
Critical thermal limits provide an indication of the range of temperatures across which organisms may survive, and the extent of the lability of these limits offers insights into the likely impacts of changing thermal environments on such survival. However, investigations of these limits may be affected by the circumstances under which trials are undertaken. Only a few studies have examined these effects, and typically not for beetles. This group has also not been considered in the context of the time courses of acclimation and its reversal, both of which are important for estimating the responses of species to transient temperature changes. Here we therefore examine the effects of rate of temperature change on critical thermal maxima (CTmax) and minima (CTmin), as well as the time course of the acclimation response and its reversal in two beetle species, Tenebrio molitor and Cyrtobagous salviniae. Increasing rates of temperature change had opposite effects on T. molitor and C. salviniae. In T. molitor, faster rates of change reduced both CTmax (c. 2 degrees C) and CTmin (c. 3 degrees C), while in C. salviniae faster rates of change increased both CTmax (c. 6 degrees C) and CTmin (c. 4 degrees C). CTmax in T. molitor showed little response to acclimation, while the response to acclimation of CTmin was most pronounced following exposure to 35 degrees C (from 25 degrees C) and was complete within 24 h. The time course of acclimation of CTmax in C. salviniae was 2 days when exposed to 36 degrees C (from c. 26 degrees C), while that of CTmin was less than 3 days when exposed to 18 degrees C. In T. molitor, the time course of reacclimation to 25 degrees C after treatments at 15 degrees C and 35 degrees C at 75% RH was longer than the time course of acclimation, and varied from 3-6 days for CTmax and 6 days for CTmin. In C salviniae, little change in CTmax and CTmin in (