Linking critical thermal maximum to mortality from thermal stress in a cold-water frog

Linking critical thermal maximum to mortality from thermal stress in a cold-water frog
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将冷水蛙的临界热最大值与热应激死亡率联系起来

DOI:
10.1098/rsbl.2023.0106
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发表时间:
2023
期刊:
影响因子:
3.3
通讯作者:
Funk, W. Chris
Funk, W. Chris
中科院分区:
生物学2区
文献类型:
--
作者:
Cicchino, Amanda S.;Ghalambor, Cameron K.;Funk, W. Chris

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对生物耐热性的估计经常被用来评估气候变暖带来的生理风险,然而,认为这些估计可以预测死亡率的假设受到了质疑。我们在冷水专家青蛙Ascaphus montanus身上测试了这一假设。采用动态实验方法测定了7个种群的蝌蚪临界最高温度(CTmax),并测定了在不同温度下3d的慢性热应激死亡率。我们测试了先前估计的种群CTmax和观察到的死亡率之间的关系,以及CTmax作为死亡率预测因子的强度,并与捕捉不同时间尺度的当地溪流温度进行了比较。CTmax较高的种群在最高温度(25℃)处理下的死亡率显著降低。我们还发现,作为观察到的死亡率的最高预测因子,人口CTmax的表现优于流温指标。这些结果表明CTmax和热应激死亡率之间存在明显的联系,为CTmax是生理脆弱性评估的相关指标提供了证据。
Estimates of organismal thermal tolerance are frequently used to assess physiological risk from warming, yet the assumption that these estimates are predictive of mortality has been called into question. We tested this assumption in the cold-water-specialist frog,Ascaphus montanus. For seven populations, we used dynamic experimental assays to measure tadpole critical thermal maximum (CTmax) and measured mortality from chronic thermal stress for 3 days at different temperatures. We tested the relationship between previously estimated population CTmax and observed mortality, as well as the strength of CTmax as a predictor of mortality compared to local stream temperatures capturing varying timescales. Populations with higher CTmax experienced significantly less mortality in the warmest temperature treatment (25°C). We also found that population CTmax outperformed stream temperature metrics as the top predictor of observed mortality. These results demonstrate a clear link between CTmax and mortality from thermal stress, contributing evidence that CTmax is a relevant metric for physiological vulnerability assessments.
寻找正确的热极限:协调变温动物 CTmax 的生态、生理和方法学方面的框架。
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