Am Nat. 2023 Apr;201(4):610-618. doi: 10.1086/723243. Epub 2023 Feb 10.
AbstractConventional analyses suggest that the metabolism of heterotrophs is thermally more sensitive than that of autotrophs, implying that warming leads to pronounced trophodynamic imbalances. However, these analyses inappropriately combine within- and across-taxa trends. Our new analysis separates these, revealing that 92% of the difference in the apparent thermal sensitivity between autotrophic and heterotrophic protists does indeed arise from within-taxa responses. Fitness differences among taxa adapted to different temperature regimes only partially compensate for the positive biochemical relationship between temperature and growth rate within taxa, supporting the hotter-is-partially-better hypothesis. Our work highlights the importance of separating within- and across-taxa responses when comparing temperature sensitivities between groups, which is relevant to how trophic imbalances and carbon fluxes respond to warming.
摘要 传统分析表明，异养生物的代谢比自养生物更受温度影响，这意味着升温会导致明显的营养动态失衡。然而，这些分析不适当地结合了分类内和跨分类的趋势。我们的新分析将这些趋势分开，结果表明，自养生物和异养原生生物之间明显的热敏感性差异的 92%确实是由于分类内的反应造成的。适应不同温度范围的分类群之间的适应性差异只能部分补偿分类内温度和生长速率之间的正生化关系，这支持了“更热的部分更好”的假说。我们的工作强调了在比较不同群体之间的温度敏感性时，区分分类内和跨分类群反应的重要性，这与营养失衡和碳通量对升温的响应有关。
