Mechanistic constraints on the trade-off between photosynthesis and respiration in response to warming

Suzana G. Leles; Naomi M. Levine

doi:10.1126/sciadv.adh8043

journal article Sep 01, 2023

Mechanistic constraints on the trade-off between photosynthesis and respiration in response to warming

Suzana G. Leles Naomi M. Levine

Science Advances Vol. 9 No. 35 · American Association for the Advancement of Science (AAAS)

View at Publisher Save 10.1126/sciadv.adh8043

Abstract

Phytoplankton are responsible for half of all oxygen production and drive the ocean carbon cycle. Metabolic theory predicts that increasing global temperatures will cause phytoplankton to become more heterotrophic and smaller. Here, we uncover the metabolic trade-offs between cellular space, energy, and stress management driving phytoplankton thermal acclimation and how these might be overcome through evolutionary adaptation. We show that the observed relationships between traits such as chlorophyll, lipid content, C:N, and size can be predicted on the basis of the metabolic demands of the cell, the thermal dependency of transporters, and changes in membrane lipids. We suggest that many of the observed relationships are not fixed physiological constraints but rather can be altered through adaptation. For example, the evolution of lipid metabolism can favor larger cells with higher lipid content to mitigate oxidative stress. These results have implications for rates of carbon sequestration and export in a warmer ocean.

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Published: Sep 01, 2023
Vol/Issue: 9(35)

Authors

S

Suzana G. Leles

Department of Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA.

N

Naomi M. Levine

Department of Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA.

Cite This Article

Suzana G. Leles, Naomi M. Levine (2023). Mechanistic constraints on the trade-off between photosynthesis and respiration in response to warming. Science Advances, 9(35). https://doi.org/10.1126/sciadv.adh8043

Mechanistic constraints on the trade-off between photosynthesis and respiration in response to warming

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