Global variation in thermal physiology of birds and mammals: evidence for phylogenetic niche conservatism only in the tropics
Global variation in thermal physiology of birds and mammals: evidence for phylogenetic niche conservatism only in the tropics
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DOI：
10.1111/jbi.12573
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发表时间：
2015-11-01
影响因子：
3.9
通讯作者：
Hof, Christian
中科院分区：
文献类型：
--
作者：
Khaliq, Imran;Fritz, Susanne A.;Hof, Christian
接近基本气候生态位的生理特征--物种生存的气候条件--是在历史和当前环境约束下适应环境的结果。如果物种间生理性状的大量变异可以用它们的系统发育来解释，而不是用当时的环境条件来解释，这将表明生理性状的系统发育保守性，即物种随着时间的推移保持其祖先生理学的趋势。在这里，我们评估的相对贡献的生殖和环境，以解释在全球范围内的鸟类和哺乳动物的生理特征的变化，以及分别为热带与温带物种。对552只恒温动物的热特性和基础代谢率的影响（255种鸟类和297种哺乳动物），沿着系统发育、地理和气候数据。我们的分析，这是单独进行的鸟类和哺乳动物，分区的相对贡献的系统发育和环境距离matrix.ResultsOverall的比较生理数据的变化，目前的环境解释了更大的量的物种之间的热性状的变化比的同源性。然而，我们发现，在热带地区的生理性状的变化，而环境是更重要的比在温带species.Main conclusionsWhile证据系统发育保守性在全球范围内的生理性状的变化比当前环境更重要，热带物种的结果表明系统发育保守性在其生理性状。这些结果表明，热带物种保留其祖先的热特性，这可能反过来意味着热带物种的生理适应性较低，以持续和未来的气候变化的更强的趋势。
AimPhysiological traits that approximate the fundamental climatic niche - the climatic conditions where a species can survive - are the outcome of adaptation to the environment under historical and current environmental constraints. If a large amount of the variation in physiological traits among species can be explained by their phylogeny rather than by contemporary environmental conditions, this would indicate phylogenetic conservatism in physiological traits, i.e. the tendency of species to retain their ancestral physiology over time. Here, we evaluate the relative contributions of phylogeny and environment to explain the variation in physiological traits of birds and mammals at the global level, as well as separately for tropical versus temperate species.LocationGlobal.MethodsWe compiled a large data set from the literature, on the thermal traits and basal metabolic rates of 552 endotherms (255 bird and 297 mammal species) as measured in physiological experiments, along with phylogenetic, geographical and climatic data. Our analyses, which were performed separately for birds and mammals, partitioned the variation in comparative physiological data into the relative contributions of phylogenetic and environmental distance matrices.ResultsOverall, the current environment explained a larger amount of variation in thermal traits among species than the phylogeny. However, we found that phylogeny was much more important than current environment for explaining the variation in physiological traits in the tropics, whereas environment was more important than phylogeny in temperate species.Main conclusionsWhile evidence for phylogenetic conservatism in physiological traits at the global level was weak, results for tropical species suggest phylogenetic conservatism in their physiological traits. These results indicate a stronger tendency in tropical species to retain their ancestral thermal traits, which might in turn imply a lower physiological adaptability of tropical species to ongoing and future climate change.