Macroecological relationships provide insights into rules that govern ecological systems. Bergmann's rule posits that members of the same clade are larger at colder temperatures. Whether temperature drives this relationship is debated because several other potential drivers covary with temperature. We conducted a near-global comparative analysis on marine copepods (97 830 samples, 388 taxa) to test Bergmann's rule, considering other potential drivers. Supporting Bergmann's rule, we found temperature better predicted size than did latitude or oxygen, with body size decreasing by 43.9% across the temperature range (-1.7 to 30ºC). Body size also decreased by 26.9% across the range in food availability. Our results provide strong support for Bergman's rule in copepods, but emphasises the importance of other drivers in modifying this pattern. As the world warms, smaller copepod species are likely to emerge as ‘winners', potentially reducing rates of fisheries production and carbon sequestration.

中文翻译：

---

在海洋桡足类动物中测试伯格曼法则

宏观生态关系提供了对管理生态系统规则的见解。伯格曼法则假定同一进化枝的成员在较冷的温度下较大。温度是否会驱动这种关系存在争议，因为其他几个潜在的驱动因素会随温度而变化。我们对海洋桡足类（97 830 个样本，388 个分类群）进行了近乎全球的比较分析，以测试伯格曼规则，同时考虑其他潜在驱动因素。支持伯格曼规则，我们发现温度比纬度或氧气更好地预测尺寸，在整个温度范围内（-1.7 到 30ºC），身体尺寸减少了 43.9%。在食物供应范围内，体型也减少了 26.9%。我们的结果为伯格曼在桡足类中的规则提供了强有力的支持，但强调其他驱动程序在修改此模式中的重要性。随着世界变暖，较小的桡足类物种可能会成为“赢家”，这可能会降低渔业生产和碳固存的速度。