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.Abstract
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 Oceanography2021, 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
Geochemistry
Oceanography, Hydrology, Water Resources
Publication Identifiers
DOI: https://doi.org/10.1002/lno.11619
URI (permanent link to this page)
https://res.slu.se/id/publ/108417