Resistance to temperature extremes in sub-Antarctic weevils: interspecific variation, population differentiation and acclimation
Resistance to temperature extremes in sub-Antarctic weevils: interspecific variation, population differentiation and acclimation
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DOI：
10.1046/j.1095-8312.2003.00154.x
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发表时间：
2003-03-01
影响因子：
1.9
通讯作者：
Chown, SL
中科院分区：
文献类型：
--
作者：
Klok, CJ;Chown, SL
许多关于陆生节肢动物对高温和低温的反应的研究都是在果蝇等模式生物上进行的。然而，相当大的变化，耐热性划分在家庭水平和以上，提出了更广泛的适用性，这项工作的其他类群的问题。在这里，我们调查耐高温和低温，不同的温度处理后，在亚Antaretic赫德岛和马里恩岛，这有很大的不同的气候中发现的10个物种和31个种群的象鼻虫。在这些象鼻虫有相当大的种间和种群间的变化，在临界热最低（CTmin）和临界热最高（CTmax），但这种变化的临界极限可以归因于表型可塑性。我们发现CTmin和CTmax之间没有关系，在物种水平上，这也是真实的人口和温度处理的反应。一般而言，CTmin的塑性（适应）变化大于CTmax。因此，我们的数据提供了支持的想法，耐热性和耐寒性是解耦的陆生节肢动物。此外，我们的研究结果表明，调查的生理限制物种边界应纳入生理能力的表型可塑性的影响。(C)2003年，伦敦林奈学会。
Much of the work on the responses of terrestrial arthropods to high and low temperatures has been done on model organisms such as Drosophila. However, considerable variation in thermotolerance is partitioned at the family level and above, raising questions about the broader applicability of this work to other taxa. Here we investigate resistance to high and low temperatures, following different temperature treatments, in ten species and 31 populations of weevils found on sub-Antaretic Heard Island and Marion Island, which have substantially different climates. In these weevils there is considerable interspecific and among-population variation in critical thermal minimum (CTmin) and critical thermal maximum (CTmax), but most of this variation in critical limits can be ascribed to phenotypic plasticity. We find no relationship between CTmin and CTmax at the species level, and this is true also of populations and of responses to the temperature treatments. In general, plastic (acclimation) changes in CTmin are larger than those in CTmax. Our data therefore provide support for the idea that resistance to heat and to cold are decoupled in terrestrial arthropods. Furthermore, our results suggest that investigations of physiological limits to species borders should incorporate the effects of phenotypic plasticity on physiological capabilities. (C) 2003 The Linnean Society of London.