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The biogeography of thermal risk for terrestrial ectotherms: scaling of thermal tolerance with body size and latitude
Journal of Animal Ecology ( IF 4.8 ) Pub Date : 2020-02-28 , DOI: 10.1111/1365-2656.13181
Juan G Rubalcaba 1 , Miguel Á Olalla-Tárraga 1
Affiliation  

1.Many organisms are shrinking in size in response to global warming. However, we still lack a comprehensive understanding of the mechanisms linking body size and temperature of organisms across their geographical ranges. Here we investigate the biophysical mechanisms determining the scaling of body temperature with size across latitudes in terrestrial ectotherms. 2.Using biophysical models, we simulated operative temperatures experienced by lizard-like ectotherms as a function of microclimatic variables, body mass and latitude and used them to generate null predictions for the effect of size on temperature across geographical gradients. We then compared model predictions against empirical data on lizards' field body temperature (Tb), and thermal tolerance limits (CTmax and CTmin). 3.Our biophysical models predict that the allometric scaling of operative temperatures with body size varies with latitude, with a positive relationship at low latitudes that vanishes with increasing latitude. The analyses of thermal traits of lizards show a significant interaction of body size and latitude on Tb and CTmax and no effect of body mass on CTmin, consistent with model's predictions. The estimated scaling coefficients are within the ranges predicted by the biophysical model. The effect of body mass, however, becomes non-significant after controlling for the phylogenetic relatedness between species. 4.We propose that large-bodied terrestrial ectotherms exhibit higher risk of overheating at low latitudes, while size differences in thermal sensitivity vanish towards higher latitudes. 5.Our work highlights the potential of combining mechanistic models with empirical data to investigate the mechanisms underpinning broad-scale patterns and ultimately provide a null model to develop baseline expectations for further empirical research.

中文翻译:

陆地外温动物热风险的生物地理学:热耐受性随体型和纬度的变化

1.为了应对全球变暖,许多生物体的体积正在缩小。然而,我们仍然缺乏对跨越地理范围的生物体大小和温度之间联系机制的全面了解。在这里,我们研究了生物物理机制,该机制决定了陆地外温动物跨纬度的体温随大小的变化。2. 使用生物物理模型,我们模拟了类蜥蜴外温动物所经历的操作温度,作为小气候变量、体重和纬度的函数,并使用它们生成大小对跨地理梯度的温度影响的无效预测。然后,我们将模型预测与蜥蜴野外体温 (Tb) 和热耐受极限(CTmax 和 CTmin)的经验数据进行比较。3. 我们的生物物理模型预测,操作温度随体型的异速生长随纬度变化,在低纬度呈正相关,随着纬度的增加而消失。蜥蜴的热特性分析表明,体型和纬度对 Tb 和 CTmax 有显着的相互作用,而体重对 CTmin 没有影响,与模型的预测一致。估计的比例系数在生物物理模型预测的范围内。然而,在控制物种之间的系统发育相关性后,体重的影响变得不显着。4.我们提出,体型大的陆地外温动物在低纬度地区表现出更高的过热风险,而热敏感性的大小差异向高纬度地区消失。5.
更新日期:2020-02-28
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