Interspecies physiological variation as a tool for cross-species assessments of global warming-induced endangerment: validation of an intrinsic determinant of macroecological and phylogeographic structure
Interspecies physiological variation as a tool for cross-species assessments of global warming-induced endangerment: validation of an intrinsic determinant of macroecological and phylogeographic structure
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DOI：
10.1098/rsbl.2007.0259
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发表时间：
2007-12-22
期刊：
影响因子：
3.3
通讯作者：
Crandall, Keith A.
中科院分区：
文献类型：
--
作者：
Bernardo, Joseph;Ossola, Ryan J.;Crandall, Keith A.
全球变暖现在被认为是对生物多样性的主要威胁，因为即使是受保护的种群和栖息地也容易受到影响。尽管如此，目前评估物种相对濒危的标准仍然纯粹是生态的，而公认的栖息地保护和种群管理的保护策略假设，如果给予保护，物种可以产生生态反应。气候变化的潜在威胁是，它将减弱或阻止生理上受到限制的物种的生态反应；然而，目前还缺乏定量的、客观的标准来评估不同分类群对变暖胁迫的相对易感性。我们通过将物种的生理表型与生态和遗传交换的景观模式联系起来，探索了利用种间生理变异来实现这一目的的效用。利用一个生态、遗传和生理多样性都很好地表征的蝾螈模型系统，我们发现基础代谢率（BMR）与宏观生态和系统地理模式都有很强的定量关系，BMR的降低导致了扩散限制（小范围的当代分布，系统地理结构明显）。内在生理耐受性的测量随宏观生态和系统地理模式而有系统地变化，为评估各种物种的濒危提供了客观标准，应纳入目前完全依赖生态预测指标的保护评估标准。
Global warming is now recognized as the dominant threat to biodiversity because even protected populations and habitats are susceptible. Nonetheless, current criteria for evaluating species' relative endangerment remain purely ecological, and the accepted conservation strategies of habitat preservation and population management assume that species can mount ecological responses if afforded protection. The insidious threat from climate change is that it will attenuate or preclude ecological responses by species that are physiologically constrained; yet, quantitative, objective criteria for assessing relative susceptibility of diverse taxa to warming-induced stress are wanting. We explored the utility of using interspecies physiological variation for this purpose by relating species' physiological phenotypes to landscape patterns of ecological and genetic exchange. Using a salamander model system in which ecological, genetic and physiological diversity are well characterized, we found strong quantitative relationships of basal metabolic rates (BMRs) to both macroecological and phylogeographic patterns, with decreasing BMR leading to dispersal limitation (small contemporary ranges with marked phylogeographic structure). Measures of intrinsic physiological tolerance, which vary systematically with macroecological and phylogeographic patterns, afford objective criteria for assessing endangerment across a wide range of species and should be incorporated into conservation assessment criteria that currently rely exclusively upon ecological predictors.