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Comparisons of behavioural and TRPA1 heat sensitivities in three sympatric Cuban Anolis lizards

机译：三个合并古巴Anolis蜥蜴的行为和TRPA1热敏比较

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Thermal tolerances of organisms play a role in defining geographic ranges and occurrence of species. In Cuba, three sympatric species of Anolis lizards (Anolis allogus, Anolis homolechis and Anolis sagrei) inhabit different thermal microhabitats. A previous study found that these species showed distinct gene expression patterns in response to temperature stimuli, suggesting the genetically distinct thermal physiology among species. To investigate whether the Anolis species inhabiting locally distinct thermal habitats diverge their thermal tolerances, we first conducted behavioural experiments to analyse the temperatures at which the three Anolis species escape from heat source. Then, for each of the three species, we isolated cDNA encoding a putative molecular heat sensor, transient receptor potential ion channel ankyrin 1 (TRPA1), which has been suggested to play a role on eliciting behavioural responses to heat stimuli. We performed electrophysiological analysis to quantify activation temperature of Anolis TRPA1 to see whether the pattern of divergence in TRPA1 responses is congruent with that of divergence in behavioural responses. We found that temperatures triggering behavioural and TRPA1 responses were significantly lower for shade-dwelling species (A. allogus) than for sun-dwelling species (A. homolechis and A. sagrei). The ambient temperature of shade habitats where A. allogus occurs stays relatively cool compared to that of open habitats where A. homolechis and A. sagrei occur and bask. The high temperature thresholds of A. homolechis and A. sagrei may reflect their heat tolerances that would benefit these species to inhabit the open habitats.
机译：生物体的热耐受性在定义地理范围和物种的发生方面发挥作用。在古巴，三个Anolis蜥蜴（Anolis Allogus，Anolis Homolechis和AnoLis Sagrei）的三种合并物种居住不同的热微藻。先前的研究发现，这些物种响应于温度刺激而显示出不同的基因表达模式，表明物种之间的遗传杂于突出的热生理学。为了研究居住在局部不同的热栖息地的AnOLIS物种是否分歧，我们首先进行行为实验，以分析三个AnOLIS物种逃离热源的温度。然后，对于三种种类中的每一种，我们分离编码推定的分子热传感器的cDNA，瞬态受体电位离子通道ankylin 1（TRPA1），这提出了在引发对热刺激的引发行为响应中起作用。我们进行了电生理分析，以量化AnOLIS TRPA1的激活温度，看看TRPA1响应中的分歧模式是否与行为反应的分歧中的一致性。我们发现触发行为和TRPA1响应的温度对于遮蔽物种（A. AlloGus）而不是太阳居住物种（A. Homolechis和A. Sagrei）显着降低。与A allogus发生的环境温度相比，与A. Homolechis和A. SAGREI发生和晒太阳的开放栖息地相比，血小曲线的环境温度保持相对凉爽。 A. Homolechis和A. Sagrei的高温阈值可能反映其耐热性，这些耐热性会使这些物种居住在开放的栖息地。

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