Cold tolerance of mountain stoneflies (Plecoptera: Nemouridae) from the high Rocky Mountains
Cold tolerance of mountain stoneflies (Plecoptera: Nemouridae) from the high Rocky Mountains
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落基山脉高山石蝇（Plecoptera：Nemouridae）的耐寒性
DOI：
10.1101/2020.06.25.171934
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发表时间：
2020
影响因子：
0.6
通讯作者：
Kelley, JL
中科院分区：
文献类型：
--
作者：
Hotaling, S.;Shah, A.A.;Dillon, M.E.;Giersch, J.J.;Tronstad, L.M.;Finn, DS;Woods, HA;Kelley, JL
。水生昆虫是如何应对低温的，人们知之甚少。对于高海拔的物种来说尤其如此，它们经常经历季节性冻结的风险。在落基山脉，石蝇（翼翅目：石蝇科）是山溪生物多样性的主要组成部分，通常在冰川和雪原提供的河流中发现，这些河流由于气候变化而迅速消退。预测气候变化对山石蝇的影响是困难的，因为它们的热生理在很大程度上是未知的。研究了来自美国落基山脉的几种高山石蝇（lenia tumana、lenia tetonica和zapadaspp .）的耐寒性。我们测量了从一系列热环境中收集的晚期若虫的过冷点（SCP）和对冰封的耐受性。SCP因物种和种群而异，来自高山池塘的若虫的SCP最低，而高山池塘在冬天比流动的溪流更容易结冰。我们也证明了l。在相对温和的温度（-0.5°C）下，即使在短时间内（<3小时），鳄蜥也不能在冰中存活。我们的研究结果表明，高海拔石蝇在更大的冻结风险中可能具有相应的较低的scp，尽管它们与冰川融水有共同的联系，但这些石蝇似乎生活在其较低的热极限附近。
.How aquatic insects cope with cold temperatures is poorly understood. This is particularly true for high-elevation species, which often experience a seasonal risk of freezing. In the Rocky Mountains, nemourid stoneflies (Plecoptera: Nemouridae) are a major component of mountain stream biodiversity and are typically found in streams fed by glaciers and snowfields, which are rapidly receding due to climate change. Predicting the effects of climate change on mountain stoneflies is difficult because their thermal physiology is largely unknown. We investigated cold tolerance of several alpine stoneflies (Lednia tumana,Lednia tetonica, andZapadaspp.) from the Rocky Mountains, USA. We measured the supercooling point (SCP) and tolerance to ice enclosure of late-instar nymphs collected from a range of thermal regimes. SCPs varied among species and populations, with the lowest SCP measured for nymphs from an alpine pond, which was much more likely to freeze solid in winter than flowing streams. We also show thatL. tumanacannot survive being enclosed in ice, even for short periods of time (<3 h) at relatively mild temperatures (–0.5 °C). Our results indicate that high-elevation stoneflies at greater risk of freezing may have correspondingly lower SCPs, and despite their common association with glacial meltwater, these stoneflies appear to be living near their lower thermal limits.