Role of carbon allocation efficiency in the temperature dependence of autotroph growth rates

Proceedings of the National Academy of Sciences of the United States of America
Bernardo García-CarrerasSamraat Pawar

Abstract

Relating the temperature dependence of photosynthetic biomass production to underlying metabolic rates in autotrophs is crucial for predicting the effects of climatic temperature fluctuations on the carbon balance of ecosystems. We present a mathematical model that links thermal performance curves (TPCs) of photosynthesis, respiration, and carbon allocation efficiency to the exponential growth rate of a population of photosynthetic autotroph cells. Using experiments with the green alga, Chlorella vulgaris, we apply the model to show that the temperature dependence of carbon allocation efficiency is key to understanding responses of growth rates to warming at both ecological and longer-term evolutionary timescales. Finally, we assemble a dataset of multiple terrestrial and aquatic autotroph species to show that the effects of temperature-dependent carbon allocation efficiency on potential growth rate TPCs are expected to be consistent across taxa. In particular, both the thermal sensitivity and the optimal temperature of growth rates are expected to change significantly due to temperature dependence of carbon allocation efficiency alone. Our study provides a foundation for understanding how the temperature dependence of carbon a...Continue Reading

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Citations

Mar 3, 2020·Evolution; International Journal of Organic Evolution·Dimitrios-Georgios KontopoulosSamraat Pawar
Mar 8, 2020·Nature Communications·Stephen C MaberlyAndrew N Tyler
May 31, 2020·Nature Reviews. Microbiology·Allison J Lopatkin, James J Collins
Jul 10, 2021·Ecology Letters·Thomas P SmithSamrāt Pawar
Jul 18, 2021·Physiologia Plantarum·J Aaron HoganJeffrey M Warren

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