Thermal tolerance and the importance of microhabitats for Andean frogs in the context of land use and climate change
Thermal tolerance and the importance of microhabitats for Andean frogs in the context of land use and climate change
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DOI：
10.1111/1365-2656.13309
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发表时间：
2020-09-10
影响因子：
4.8
通讯作者：
Edwards, David P.
中科院分区：
文献类型：
--
作者：
Gonzalez-del-Pliego, Pamela;Scheffers, Brett R.;Edwards, David P.
全球变暖对生命之树产生了影响。了解物种对温度变化的生理敏感性，以及它们与栖息地局部温度变化的关系，对于确定对全球变暖的脆弱性至关重要。我们想知道物种的脆弱性在不同的栖息地和海拔是如何变化的，以及气候缓冲的微栖息地如何有助于降低它们的脆弱性。我们测量了生活在哥伦比亚安第斯山脉幼龄和老年次生林和原始林中的14种pristimantisfrog的热敏性（临界热最大值- ctmax）。通过记录下层和五个微生境的温度来测量温度应力暴露。我们确定了青蛙在不同栖息地、海拔高度和微栖息地的脆弱性，然后询问了在4种变暖情景下（+1.5、+2、+3和+5摄氏度）脆弱性的变化情况。我们发现，无论栖息地和海拔高度如何，不同物种的CT（max）都是恒定的。然而，由于越来越多地暴露于更高的温度，预计年轻次生林中的物种将变得更加脆弱。只要区域温度不超过+2℃，微生境的变化就能使物种保持在其热温度范围内。微生境缓冲的有效性在温度升高2 ~ 3℃时下降，在温度升高5℃时几乎为零。微栖息地将通过短距离移动跟踪适宜的气候，为安第斯蛙群落提供热保护，免受气候变化的影响。保护策略，例如通过保护原始森林和允许次生林的再生和重新连接来管理景观，将提供热缓冲的微栖息地，并有助于这一群体的生存。
Global warming is having impacts across the Tree of Life. Understanding species' physiological sensitivity to temperature change and how they relate to local temperature variation in their habitats is crucial to determining vulnerability to global warming. We ask how species' vulnerability varies across habitats and elevations, and how climatically buffered microhabitats can contribute to reduce their vulnerability. We measured thermal sensitivity (critical thermal maximum-CTmax) of 14 species ofPristimantisfrogs inhabiting young and old secondary, and primary forests in the Colombian Andes. Exposure to temperature stress was measured by recording temperature in the understorey and across five microhabitats. We determined frogs' current vulnerability across habitats, elevations and microhabitats accounting for phylogeny and then ask how vulnerability varies under four warming scenarios: +1.5, +2, +3 and +5 degrees C. We found that CT(max)was constant across species regardless of habitat and elevation. However, species in young secondary forests are expected to become more vulnerable because of increased exposure to higher temperatures. Microhabitat variation could enable species to persist within their thermal temperature range as long as regional temperatures do not surpass +2 degrees C. The effectiveness of microhabitat buffering decreases with a 2-3 degrees C increase, and is almost null under a 5 degrees C temperature increase. Microhabitats will provide thermal protection to Andean frog communities from climate change by enabling tracking of suitable climates through short distance movement. Conservation strategies, such as managing landscapes by preserving primary forests and allowing regrowth and reconnection of secondary forest would offer thermally buffered microhabitats and aid in the survival of this group.