Warming and temperature variability determine the performance of two invertebrate predators
Warming and temperature variability determine the performance of two invertebrate predators
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DOI：
10.1038/s41598-020-63679-0
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发表时间：
2020-04
影响因子：
4.6
通讯作者：
Sonia C. Morón Lugo;Moritz Baumeister;O. Nour;F. Wolf;M. Stumpp;C. Pansch
中科院分区：
文献类型：
--
作者：
Sonia C. Morón Lugo;Moritz Baumeister;O. Nour;F. Wolf;M. Stumpp;C. Pansch
在变暖的海洋中，温度变化会加剧峰值压力，但也会提供压力释放期。虽然对热浪的生物反应的现场观察不断出现，但实验证据很少，而且几乎缺乏短期环境变化的证据。对于两种主要的无脊椎动物捕食者，我们基于高分辨率的 15 年温度数据，模拟了当前温暖夏季气温和未来两个月变暖情景（+4°C）的正弦温度变化（±3°C），这些数据允许实现实际的季节性温度变化峰值中点。变暖降低了海星（Asterias rubens）的能量吸收（Mytilus edulisconspiration）和整体生长。变暖情景的变化给紫星带来了额外的压力，导致在正弦波动下进食提前崩溃。高峰值温度阻碍了进食，而在应激释放阶段（低温峰值）则没有得到补偿。相比之下，温度升高会增加对贻贝的摄食，但不会增加新近入侵者Hemigrapsus takanoi的生长速度，无论温度变化的范围有多大。这项研究强调了变暖对物种的特定影响，并将几天到几周/几个月范围内的温度变化确定为热响应的重要驱动因素。从未来变暖情景中可以看出，当超过物种的热极限时，温度变化就代表了额外的压力来源。
In a warming ocean, temperature variability imposes intensified peak stress, but offers periods of stress release. While field observations on organismic responses to heatwaves are emerging, experimental evidence is rare and almost lacking for shorter-scale environmental variability. For two major invertebrate predators, we simulated sinusoidal temperature variability (±3 °C) around todays’ warm summer temperatures and around a future warming scenario (+4 °C) over two months, based on high-resolution 15-year temperature data that allowed implementation of realistic seasonal temperature shifts peaking midpoint. Warming decreased sea stars’ (Asterias rubens) energy uptake (Mytilus edulisconsumption) and overall growth. Variability around the warming scenario imposed additional stress ontoAsteriasleading to an earlier collapse in feeding under sinusoidal fluctuations. High-peak temperatures prevented feeding, which was not compensated during phases of stress release (low-temperature peaks). In contrast, increased temperatures increased feeding onMytilusbut not growth rates of the recent invaderHemigrapsus takanoi, irrespective of the scale at which temperature variability was imposed. This study highlights species-specific impacts of warming and identifies temperature variability at the scale of days to weeks/months as important driver of thermal responses. When species’ thermal limits are exceeded, temperature variability represents an additional source of stress as seen from future warming scenarios.