Climate change and invasive species are among the biggest threats to global biodiversity and ecosystem function. Although the individual impacts of climate change and invasive species are commonly assessed, we know far less about how a changing climate may impact invading species. Increases in water temperature due to climate change are likely to alter the thermal regime of UK rivers, and this in turn may influence the performance of invasive species such as signal crayfish (Pacifastacus leniusculus), which are known to have deleterious impacts on native ecosystems. We evaluate the relationship between water temperature and two key performance traits in signal crayfish—feeding and burrowing rate—using thermal experiments on wild‐caught individuals in a laboratory environment. Although water temperature was found to have no significant influence on burrowing rate, it did have a strong effect on feeding rate. Using the thermal performance curve for feeding rate, we evaluate how the thermal suitability of three UK rivers for signal crayfish may change as a result of future warming. We find that warming rivers may increase the amount of time that signal crayfish can achieve high feeding rate levels. These results suggest that elevated river water temperatures as a result of climate change may promote higher signal crayfish performance in the future, further exacerbating the ecological impact of this invasive species.

中文翻译：

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在英国水域中，侵入性小龙虾的摄食和挖洞活动的热敏感性

气候变化和入侵物种是对全球生物多样性和生态系统功能的最大威胁。尽管通常评估气候变化和入侵物种对个体的影响，但是我们对气候变化如何影响入侵物种的了解还很少。由于气候变化而引起的水温升高可能会改变英国河流的热状况，这反过来可能会影响诸如小龙虾（Pacifastacus leniusculus）等入侵物种的性能。），对当地生态系统具有有害影响。我们通过在实验室环境中对野生捕获个体进行热实验，评估了水温与信号小龙虾的两个关键性能特征之间的关系（摄食率和穴居率）。尽管发现水温对挖洞速度没有显着影响，但对进食速度确实有很强的影响。使用饲料的热性能曲线，我们评估了未来变暖的结果，英国三条河流对小龙虾的热适应性可能会如何变化。我们发现，变暖的河流可能会增加小龙虾发出信号的时间，从而达到较高的摄食率水平。