Aim: Higher temperatures increase the metabolic rate of ectothermic organisms up to a certain level and make them grow faster. This temperature-sensitivity of growth is frequently used to predict the long-term effects of climate warming on ectotherms. Yet, realized growth also depends on ecological factors and evolutionary adaptation. Here we study whether faster growth is observed along temperature clines within and between marine fish species from polar to tropical regions. Location: Global. Time period: The sampling or publication year is for 718 observations before 1980, 1,073 observations between 1980 and 2000, and 390 observations after 2000 (for 336 observations no year was recorded). Major taxa studied: Marine teleost fish and elasmobranchs. Methods: The effects of temperature on fish growth are studied using 2,517 growth observations, representing 771 species in 165 marine ecoregions. The effects of temperature are presented with a Q10, describing relative increase in the rate of growth for each 10 °C increase. Results: We find weak within- and between-species effects of temperature on growth. The typical within-species effect of temperature has a Q10 of 1.1. The between-species effect is a little higher (Q10 = 1.4, or Q10 = 1.2 when corrected for phylogenetic relationships). When analysed per fish guild, growth responses vary from nearly independent of temperature in large demersals (Q10 = 1.1) to positive in small pelagics (Q10 = 1.6) and elasmobranchs (Q10 = 2.3). Average growth is higher in ecoregions with high primary production. Main conclusion: The change in average growth along temperature clines is weaker than predicted by metabolic theory, suggesting that the metabolic predictions are not sustainable in an ecosystem context. The long-term response of fish to the increase in temperature associated with climate change may hence be shaped more by local environmental and ecological dynamics than by the physiological temperature response of the species currently present.

中文翻译：

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鱼类增长率的全球分析显示，对温度的反应比代谢预测要弱

目的：较高的温度将变温生物的代谢率提高到一定水平，并使它们生长得更快。这种生长对温度的敏感性经常被用来预测气候变暖对变温动物的长期影响。然而，实现增长还取决于生态因素和进化适应。在这里，我们研究是否在从极地到热带地区的海洋鱼类物种内部和之间观察到更快的生长。地点：全球。时间段：采样或出版年份为 1980 年之前的 718 个观测值，1980 年和 2000 年之间的 1,073 个观测值，以及 2000 年之后的 390 个观测值（336 个观测值没有记录年份）。研究的主要分类群：海洋硬骨鱼和软骨鱼。方法：使用 2,517 次生长观察研究温度对鱼类生长的影响，代表 165 个海洋生态区的 771 个物种。温度的影响用 Q10 表示，描述每增加 10 °C 的增长率的相对增加。结果：我们发现温度对生长的种内和种间影响较弱。温度的典型物种内效应的 Q10 为 1.1。种间效应稍高（Q10 = 1.4，或 Q10 = 1.2，校正系统发育关系后）。当对每个鱼类行会进行分析时，生长反应从几乎不受温度影响的大型底层 (Q10 = 1.1) 到小型中上层鱼类 (Q10 = 1.6) 和 elasmobranchs (Q10 = 2.3) 不等。初级生产量高的生态区的平均增长率更高。主要结论：平均生长沿温度变化的变化比代谢理论预测的要弱，表明代谢预测在生态系统环境中是不可持续的。因此，鱼类对与气候变化相关的温度升高的长期反应可能更多地受到当地环境和生态动态的影响，而不是目前存在的物种的生理温度反应。