Streams and rivers are an important source of CO2 emissions1. One important control of these emissions is the metabolic balance between photosynthesis, which converts CO2 to organic carbon, and respiration, which converts organic carbon into CO2 (refs 2,3). Carbon emissions from rivers could increase with warming, independently of organic carbon inputs, because the apparent activation energy is predicted to be higher for respiration than photosynthesis4,5. However, physiological CO2-concentrating mechanisms may prevent the increase in photorespiration, limiting photosynthesis with warming6. Here we report the thermal response of aquatic photosynthesis from streams located in geothermal areas of North America, Iceland and Kamchatka with water temperatures ranging between 4 and 70 °C. Based on a thermodynamic theory of enzyme kinetics, we show that the apparent activation energy of aquatic ecosystem photosynthesis is approximately 0.57 electron volts (eV) for temperatures ranging from 4 to 45 °C, which is similar to that of respiration4,5,7,8,9. This result and a global synthesis of 222 streams suggest that warming will not create increased stream and river CO2 emissions from a warming-induced imbalance between photosynthesis and respiration. However, temperature could affect annual CO2 emissions from streams if ecosystem respiration is independent of gross primary production, and may be amplified by increasing organic carbon supply.
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We wish to thank the park rangers for permission to work in Iceland and Kamchatka; B. Marteau, R. Magnúsdóttir, D. Árnadóttir, Yu. Bespalaya, O. Usacheva, A. Kondakov and I. Bolotov for help with fieldwork; and Y. Cook, H. Watson, L. Johnson, S. McIntyre for processing water chemical analyses. B.O.L.D. and T.E.F. were funded by the Scottish Government Rural and Environmental Science and Analytical Services (RESAS). J.S.Ó., G.M.G. and B.O.L.D. were funded by the Icelandic National Power Company’s Energy and Environmental Fund. J.R.M. was funded by Stockton University. N.F. and the travel to Kamchatka were partly funded by AU IDEAS. J.M.H. was supported by the Icelandic Research Fund (i. Rannsóknasjóður) 141840-051 during manuscript preparation. J.J.D.T. was funded by NERC grant NE/J011967/1. Comments by S. Maberly and J. Kemp improved the manuscript.
The authors declare no competing financial interests.
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Demars, B., Gíslason, G., Ólafsson, J. et al. Impact of warming on CO2 emissions from streams countered by aquatic photosynthesis. Nature Geosci 9, 758–761 (2016). https://doi.org/10.1038/ngeo2807
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