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Research article - Peer-reviewed, 2021

Character and environmental lability of cyanobacteria-derived dissolved organic matter

Patriarca, Claudia; Sedano-Nunez, Vicente T.; Garcia, Sarahi L.; Bergquist, Jonas; Bertilsson, Stefan; Sjoberg, Per J. R.; Tranvik, Lars J.; Hawkes, Jeffrey A.


Autotrophic dissolved organic matter (DOM) is central to the carbon biogeochemistry of aquatic systems, and the full complexity of autotrophic DOM has not been extensively studied, particularly by high-resolution mass spectrometry (HRMS). Terrestrial DOM tends to dominate HRMS studies in freshwaters due to the propensity of such compounds to ionize by negative mode electrospray, and possibly also because ionizable DOM produced by autotrophy is decreased to low steady-state concentrations by heterotrophic bacteria. In this study, we investigated the character of DOM produced by the widespread cyanobacteriaMicrocystis aeruginosausing high-pressure liquid chromatography-electrospray ionization-high-resolution mass spectrometry.M. aeruginosaproduced thousands of detectable compounds in axenic culture. These compounds were chromatographically resolved and the majority were assigned to aliphatic formulas with a broad polarity range. We found that the DOM produced byM. aeruginosawas highly susceptible to removal by heterotrophic freshwater bacteria, supporting the hypothesis that this autotroph-derived organic material is highly labile and accordingly only seen at low concentrations in natural settings.

Published in

Limnology and Oceanography
2021, volume: 66, number: 2, pages: 496-509
Publisher: WILEY

Authors' information

Patriarca, Claudia
Uppsala University
Sedano-Nunez, Vicente T.
Uppsala University
Garcia, Sarahi L.
Uppsala University
Bergquist, Jonas
Uppsala University
Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment
Uppsala University
Sjoberg, Per J. R.
Uppsala University
Tranvik, Lars J.
Uppsala University
Hawkes, Jeffrey A.
Uppsala University

UKÄ Subject classification

Oceanography, Hydrology, Water Resources

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