Identifying the role of temperature on species-specific performance is critical for predicting how species will respond to temperature increases expected under climate change. We compared the thermal performance of two sympatric Pacific rockfish species complexes (controls for relatedness and geographic location) that vary in larval life-history traits associated with different oceanographic regimes including temperature during early life-history stages: the BY complex (Black: Sebastes melanops, Yellowtail: S. flavidus) and the CQ complex (Copper: S. caurinus, Quillback: S. maliger). By using controlled experiments, we evaluated foraging activity, growth, and survival of young-of-the-year rockfish recruits under current and future habitat temperatures over a 14-day time period indicative of marine heatwave events expected with climate change. BY rockfish displayed a heat-intolerant behaviour by only foraging at temperatures within current habitat temperatures, whereas the CQ rockfish displayed a heat-tolerant behaviour by actively foraging at temperatures above current and future predicted temperatures for a limited time. Although growth and survival in each species significantly declined with temperature, the magnitude of the effect did not vary between species. Taken together, our results show that rockfish are capable of using different behavioural strategies to cope with warming and may be differentially impacted by future climate conditions.

中文翻译：

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四种年幼温带珊瑚鱼的热性能比较

确定温度对物种特异性表现的作用对于预测物种将如何应对气候变化下预期的温度升高至关重要。我们比较了两种同域太平洋岩鱼物种复合体（相关性和地理位置的控制）的热性能，它们在与不同海洋状况相关的幼虫生活史特征上有所不同，包括早期生活史阶段的温度：BY 复合体（黑色：Sebastes melanops , Yellowtail: S. flavidus) 和 CQ 复合体 (Copper: S. caurinus, Quillback: S. maliger)。通过使用受控实验，我们评估了在当前和未来栖息地温度下，在 14 天的时间段内，年幼岩鱼新兵的觅食活动、生长和生存情况，这表明气候变化预计会发生海洋热浪事件。BY 岩鱼仅在当前栖息地温度范围内觅食，表现出耐热行为，而 CQ 岩鱼通过在当前和未来预测温度以上的温度下在有限时间内主动觅食，表现出耐热行为。尽管每个物种的生长和存活率随着温度的升高而显着下降，但影响的大小在物种之间没有变化。总之，我们的研究结果表明，岩鱼能够使用不同的行为策略来应对变暖，并且可能会受到未来气候条件的不同影响。而 CQ 岩鱼通过在高于当前和未来预测温度的温度下在有限的时间内主动觅食而表现出耐热行为。尽管每个物种的生长和存活率随着温度的升高而显着下降，但影响的大小在物种之间没有变化。总之，我们的研究结果表明，岩鱼能够使用不同的行为策略来应对变暖，并且可能会受到未来气候条件的不同影响。而 CQ 岩鱼通过在高于当前和未来预测温度的温度下在有限的时间内主动觅食而表现出耐热行为。尽管每个物种的生长和存活率随着温度的升高而显着下降，但影响的大小在物种之间没有变化。总之，我们的研究结果表明，岩鱼能够使用不同的行为策略来应对变暖，并且可能会受到未来气候条件的不同影响。