The present study determined the effect of body mass and acclimation temperature (15-28°C) on oxygen consumption rate (ṀO2 ) and the size dependency of preferred temperature in European perch Perca fluviatilis. Standard metabolic rate (SMR) scaled allometrically with body mass by an exponent of 0.86. Temperature influenced SMR with a Q10 of 1.9 regardless of size. Maximum metabolic rate (MMR) and aerobic scope (MMR-SMR) scaled allometrically with body mass by exponents of 0.75-0.88. The mass scaling exponents of MMR and aerobic scope changed with temperature, and were lowest at the highest temperature. Consequently, The optimal temperature for aerobic scope decreased with increasing body mass. Notably, fish <40 g did not show a decrease aerobic scope with increasing temperature. Factorial aerobic scope (MMR ∙ SMR-1 ) generally decreased with increasing temperatures, was unaffected by size at the lower temperatures, and scaled negatively with body mass at the highest temperature. Similar to the optimal temperature for aerobic scope, preferred temperature declined with increasing body mass, unaffectedly by acclimation temperature. The present study indicates a limitation in the capacity for oxygen uptake in larger fish, while smaller fish do not appear oxygen limited. A constraint in oxygen uptake at high temperature may restrict growth of larger fish with environmental warming, at least if food availability is not limited. Furthermore, behavioural thermoregulation may be contributing to changes in size distribution of fish in the wild caused by global warming as larger individuals will prefer colder water at higher latitudes and at larger depths than smaller conspecifics with increasing environmental temperatures. This article is protected by copyright. All rights reserved.

中文翻译：

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体型和温度对欧洲鲈鱼的耗氧率和偏好温度的大小依赖性的综合影响

本研究确定了体重和适应温度 (15-28°C) 对欧洲鲈鱼的耗氧率 (ṀO2 ) 和首选温度的大小依赖性的影响。标准代谢率 (SMR) 与体重以 0.86 的指数异速缩放。无论尺寸如何，温度都会影响 SMR，Q10 为 1.9。最大代谢率 (MMR) 和有氧范围 (MMR-SMR) 与体重以 0.75-0.88 的指数异速生长。MMR和有氧范围的质量标度指数随温度变化，在最高温度时最低。因此，有氧范围的最佳温度随着体重的增加而降低。值得注意的是，<40 g 的鱼没有表现出随着温度升高有氧范围的减小。因子有氧范围 (MMR ∙ SMR-1 ) 通常随着温度的升高而减小，在较低温度下不受大小的影响，在最高温度下与体重成负相关。类似于有氧范围的最佳温度，首选温度随着体重的增加而下降，不受适应温度的影响。目前的研究表明，较大鱼的摄氧能力有限，而较小的鱼则似乎没有氧气限制。高温下摄氧量的限制可能会随着环境变暖而限制大型鱼类的生长，至少在食物供应不受限制的情况下。此外，行为体温调节可能会导致全球变暖引起的野外鱼类体型分布的变化，因为随着环境温度的升高，体型较大的个体比较小的同种个体更喜欢高纬度和更大深度的较冷的水。本文受版权保护。版权所有。