Response to thermal and hydric regimes point to differential inter- and intraspecific vulnerability of tropical amphibians to climate warming
Response to thermal and hydric regimes point to differential inter- and intraspecific vulnerability of tropical amphibians to climate warming
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对热量和水分状况的响应表明热带两栖动物对气候变暖的不同种间和种内脆弱性
DOI：
10.1016/j.jtherbio.2021.103148
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发表时间：
2022
影响因子：
2.7
通讯作者：
Burrowes, Patricia A.
中科院分区：
文献类型：
--
作者：
Delgado-Suazo, Peter;Burrowes, Patricia A.
在波多黎各这个受到气候变暖威胁的岛屿上，两种青蛙中只有一种在最近经历了向更高海拔地区的范围收缩。我们质疑它们对温度和脱水的生理反应差异是否可以解释这种分布变化。我们研究了一个低地和一个高地种群的Eleutherodactylus coqui，一个广泛分布的通才，和E. portoricensis，一个濒危物种，目前只发现超过600米。我们比较了各种生理方面：操作温度;温度选择;临界温度;以及它们在各种热和氢制度下对跳跃性能测试的反应。结果表明，在实验温度梯度中，门冬尺蠖的CTmin最高，CTmax最低，且选择较低的温度范围。三个种群的跳跃性能随着温度的升高而增加，直到达到最大性能。之后，性能急剧下降，直到达到CTmax。脱水对这两个物种的性能有负面影响，特别是对最大性能。这种影响对波多里艾树最大，其次是高海拔艾树。考基。显着更大的热-水生理限制的E.portoricensis可能解释其最近的范围收缩，作为一种潜在的，作为对气候变暖的反应。低海拔科基人的有效变暖耐受力最低，是唯一选择与其环境中遇到的温度相同的温度的群体，这表明它可能仅能适应当地的热条件，因此也容易受到气候变化的影响。我们的结果指向可塑性的反应ofE。气候条件的变化，并提出证据表明，在同一地点密切相关的物种之间的不同生理反应。这项工作强调了研究温度和水合作用的综合影响对于了解外温动物对变暖环境的反应的重要性，并提供了进一步的证据表明干燥可能是决定哪些物种可能生存的限制因素。
In Puerto Rico, an island threatened by climate warming, only one of two species of frogs that share part of their distribution has undergone a recent range contraction to higher elevations. We questioned if differences in their physiological response to temperature and dehydration might explain this distributional change. We studied a lowland and a highland population ofEleutherodactylus coqui, a widespread generalist, andE.portoricensis, an endangered species that is currently found only above 600 m. We compared various physiological aspects: operative temperature; temperature selection; critical temperatures; and their response to jumping performance tests at various thermal and hydric regimes. Results revealed thatE.portoricensishad the highest CTminand lowest CTmaxand selected a cooler range of temperatures from the experimental gradient. Jumping performance increased with temperature for the three populations until attaining maximum performance. Afterwards, performance dropped drastically until reaching CTmax. Dehydration had a negative effect on performance for both species, particularly on maximum performance. This effect was greatest forE.portoricensis,followed by high-elevationE. coqui. The significantly greater thermo-hydric physiological limitations ofE.portoricensismay explain its recent range contraction, potentially, as a response to climate warming. Low-elevationE. coquihad the lowest operative warming tolerance and was the only population to select temperatures like those encountered in their environment, indicating it may be narrowly adapted to local thermal conditions and thus, also vulnerable to climate change. Our results point towards plasticity in the response ofE. coquito varying climatic conditions, and present evidence of different physiological responses between closely related species at the same locality. This work highlights the importance of studying the combined effects of temperature and hydration to understand the response of ectotherms to warming environments and presents further evidence that desiccation may be a limiting factor determining which species may survive.