Partitioning the Apparent Temperature Sensitivity into Within- and Across-Taxa Responses: Revisiting the Difference between Autotrophic and Heterotrophic Protists
Partitioning the Apparent Temperature Sensitivity into Within- and Across-Taxa Responses: Revisiting the Difference between Autotrophic and Heterotrophic Protists
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DOI：
10.1086/723243
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发表时间：
2022-11
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通讯作者：
Bingzhang Chen (陈炳章);D. Montagnes;Qing Wang (王庆);Hongbin Liu (刘红斌);S. Menden‐Deuer
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作者：
Bingzhang Chen (陈炳章);D. Montagnes;Qing Wang (王庆);Hongbin Liu (刘红斌);S. Menden‐Deuer
传统的分析表明，异养生物的代谢比自养生物对热更敏感，这意味着变暖会导致明显的营养动力学失衡。然而，这些分析不恰当地结合了分类群内部和跨分类群的趋势。我们的新分析将这些分离开来，揭示了自养和异养原生生物之间表观热敏性差异的92%确实是由类群内反应引起的。不同温度环境下不同类群间的适应性差异只能部分补偿温度与生长速率之间的正生化关系，支持“越热越好”的假说。我们的工作强调了在比较不同组之间的温度敏感性时区分分类群内部和跨分类群响应的重要性，这与营养失衡和碳通量如何响应变暖有关。
Conventional 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.