Evolutionary temperature compensation of carbon fixation in marine phytoplankton.,Ecology Letters

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Evolutionary temperature compensation of carbon fixation in marine phytoplankton.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-02-14 , DOI: 10.1111/ele.13469
Samuel Barton ₁ , James Jenkins ₁ , Angus Buckling ₁ , C-Elisa Schaum ₂ , Nicholas Smirnoff ₃ , John A Raven _{4,

5,

6} , Gabriel Yvon-Durocher ₁

Affiliation

The efficiency of carbon sequestration by the biological pump could decline in the coming decades because respiration tends to increase more with temperature than photosynthesis. Despite these differences in the short-term temperature sensitivities of photosynthesis and respiration, it remains unknown whether the long-term impacts of global warming on metabolic rates of phytoplankton can be modulated by evolutionary adaptation. We found that respiration was consistently more temperature dependent than photosynthesis across 18 diverse marine phytoplankton, resulting in universal declines in the rate of carbon fixation with short-term increases in temperature. Long-term experimental evolution under high temperature reversed the short-term stimulation of metabolic rates, resulting in increased rates of carbon fixation. Our findings suggest that thermal adaptation may therefore have an ameliorating impact on the efficiency of phytoplankton as primary mediators of the biological carbon pump.

中文翻译：

海洋浮游植物固碳的进化温度补偿。

在未来几十年中，通过生物泵吸收碳的效率可能会下降，这是因为随着温度的升高呼吸作用比光合作用的上升趋势更大。尽管光合作用和呼吸作用的短期温度敏感性存在这些差异，但全球变暖对浮游植物代谢率的长期影响是否可以通过进化适应来调节尚不清楚。我们发现，在18种不同的海洋浮游植物中，呼吸作用始终比光合作用更依赖温度，这导致碳固定率普遍下降，温度短期升高。高温下的长期实验演变逆转了对代谢率的短期刺激，从而导致碳固定率提高。

更新日期：2020-02-18

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