Organic matter processing by heterotrophic bacterioplankton in a large tropical river: Relating elemental composition and potential carbon mineralization

Daniel Cuevas-Lara, Felipe García-Oliva, Salvador Sánchez-Carrillo and Javier Alcocer

PLOS ONE, 2024, vol. 19, issue 11, 1-22

Abstract: River hydrology shapes the sources, concentration, and stoichiometry of organic matter within drainage basins. However, our understanding of how the microbes process dissolved organic matter (DOM) and recycle nutrients in tropical rivers needs to be improved. This study explores the relationships between elemental DOM composition (carbon/nitrogen/phosphorus: C/N/P), C and N uptake, and C mineralization by autochthonous bacterioplankton in the Usumacinta River, one of the most important fluvial systems in Mexico. Our study investigated changes in the composition and concentration of DOM and evaluated carbon dioxide (CO2)production rates (C–CO2) through laboratory experiments. We compared three sites representing the middle and lower river basins, including their transitional zones, during the rainy and dry seasons. After incubation (120 h at 25°C), the DOM decreased between 25% and 89% of C content. Notably, the initial high proportion of C in DOM in samples from the middle–forested zone and the transition led to elevated C–CO2 rates (>10 mg l−1 day−1), in contrast to the lower initial C proportion and subsequent C–CO2 rates (

Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0311750

DOI: 10.1371/journal.pone.0311750

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