Multi‐scale relationships in thermal limits within and between two cold‐water frog species uncover different trends in physiological vulnerability
Multi‐scale relationships in thermal limits within and between two cold‐water frog species uncover different trends in physiological vulnerability
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两种冷水蛙物种内部和之间热极限的多尺度关系揭示了生理脆弱性的不同趋势
DOI：
10.1111/fwb.14102
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发表时间：
2023
影响因子：
2.7
通讯作者：
Funk, W. Chris
中科院分区：
文献类型：
--
作者：
Cicchino, Amanda S.;Shah, Alisha A.;Forester, Brenna R.;Dunham, Jason B.;Ghalambor, Cameron K.;Funk, W. Chris
1.临界温度极限代表了生物体科普未来温度变化能力的重要组成部分。了解这些特征变化的驱动因素可能会揭示气候变化的生理脆弱性模式。局部极端温度已成为热极限的主要驱动因素，尽管其影响可以通过行为温度调节来利用温度的细尺度空间变化来调节。在这里，我们研究了两种冷水蛙（Ascaphusspp.）内部和之间沿着海拔梯度的温度限制，一种是沿海分布（A. truei），另一种是大陆分布（A. montanus）。我们量化了超过700只蝌蚪的温度极限，代表了每个物种的多个种群。我们结合了当地的时间和精细尺度的空间温度数据来量化当地的热景观（即，thermalscapes），包括行为体温调节的机会。3.在没有水冻结的情况下，这两个物种的温度下限都无法通过实验达到，这表明耐寒性<0.3°C。相比之下，温度上限在种群之间存在差异，但这种变化仅反映了A.montanus的局部温度极端，可能是由于其范围内的溪流温度变化较大。最后，我们发现温度的细微空间变异性很小，这表明行为温度调节的机会有限，因此增加了所有人群对变暖的脆弱性。通过量化当地的热景观，我们发现了不同的趋势，在不同海拔的人口的相对脆弱性为每个物种。在A.truei，生理脆弱性降低海拔，而在A.montanus，所有的人口同样的生理脆弱性。这些结果强调了相似的环境如何不同地塑造物种的生理耐受性和脆弱性模式，从而影响它们对未来变暖的脆弱性。
1. Critical thermal limits represent an important component of an organism's capacity to cope with future temperature changes. Understanding the drivers of variation in these traits may uncover patterns in physiological vulnerability to climate change. Local temperature extremes have emerged as a major driver of thermal limits, although their effects can be mediated by the exploitation of fine‐scale spatial variation in temperature through behavioural thermoregulation.2. Here, we investigated thermal limits along elevation gradients within and between two cold‐water frog species (Ascaphusspp.), one with a coastal distribution (A. truei) and the other with a continental range (A. montanus). We quantified thermal limits for over 700 tadpoles, representing multiple populations from each species. We combined local temporal and fine‐scale spatial temperature data to quantify local thermal landscapes (i.e., thermalscapes), including the opportunity for behavioural thermoregulation.3. Lower thermal limits for either species could not be reached experimentally without the water freezing, suggesting that cold tolerance is <0.3°C. By contrast, upper thermal limits varied among populations, but this variation only reflected local temperature extremes inA.montanus, perhaps as a consequence of the greater variation in stream temperatures across its range. Lastly, we found minimal fine‐scale spatial variability in temperature, suggesting limited opportunity for behavioural thermoregulation and thus increased vulnerability to warming for all populations.4. By quantifying local thermalscapes, we uncovered different trends in the relative vulnerability of populations across elevation for each species. InA.truei, physiological vulnerability decreased with elevation, whereas inA.montanus, all populations were equally physiologically vulnerable. These results highlight how similar environments can differentially shape physiological tolerance and patterns of vulnerability of species, and in turn impact their vulnerability to future warming.
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