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High rates of daytime river metabolism are an underestimated component of carbon cycling

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dc.contributor.authorTromboni, Flaviaen
dc.contributor.authorHotchkiss, Erin R.en
dc.contributor.authorSchechner, Anne E.en
dc.contributor.authorDodds, Walter K.en
dc.contributor.authorPoulson, Simon R.en
dc.contributor.authorChandra, Sudeepen
dc.date.accessioned2023-04-24T13:24:23Zen
dc.date.available2023-04-24T13:24:23Zen
dc.date.issued2022-11en
dc.description.abstractDiel variations in the isotopic composition of dissolved oxygen in river water reveal high rates of gross primary production and respiration rates in 14 rivers across three biomes, suggesting that the microbial loop in rivers may cycle carbon more rapidly than thought. River metabolism and, thus, carbon cycling are governed by gross primary production and ecosystem respiration. Traditionally river metabolism is derived from diel dissolved oxygen concentrations, which cannot resolve diel changes in ecosystem respiration. Here, we compare river metabolism derived from oxygen concentrations with estimates from stable oxygen isotope signatures (delta O-18(2)) from 14 sites in rivers across three biomes using Bayesian inverse modeling. We find isotopically derived ecosystem respiration was greater in the day than night for all rivers (maximum change of 113 g O-2 m(-2) d(-1), minimum of 1 g O-2 m(-2) d(-1)). Temperature (20 degrees C) normalized rates of ecosystem respiration and gross primary production were 1.1 to 87 and 1.5 to 22-fold higher when derived from oxygen isotope data compared to concentration data. Through accounting for diel variation in ecosystem respiration, our isotopically-derived rates suggest that ecosystem respiration and microbial carbon cycling in rivers is more rapid than predicted by traditional methods.en
dc.description.notesWe thank Khaliun Sanchir, Bonnie Trejo, Loren Secor, Dr. Liana Prudencio, Christie Carey, Dr. Thomas Harmon, Dr. Curtis Gray, Dr. Brian Reid, Samadee Saray, and Lizzy Sisson for their help in the field. Funding for this work was provided by NSF Macrosystems Biology (MSB) grants 1442562 to S.C., and MSB grant 1442544 to W.K.D., and by USAID's "Wonders of the Mekong" Cooperative Agreement No: AID-OAA-A-16-00057 to Zeb Hogan and S.C. F.T. also received support through a visiting postdoc fellowship by the Leibniz Institute of Freshwater Ecology and Inland Fisheries. Picture of the Mekong site courtesy of Dr. Liana Prudencio.en
dc.description.sponsorshipNSF Macrosystems Biology (MSB) [1442562, 1442544]; USAID's "Wonders of the Mekong" Cooperative Agreement [AID-OAA-A-16-00057]; Leibniz Institute of Freshwater Ecology and Inland Fisheriesen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s43247-022-00607-2en
dc.identifier.eissn2662-4435en
dc.identifier.issue1en
dc.identifier.other270en
dc.identifier.urihttp://hdl.handle.net/10919/114758en
dc.identifier.volume3en
dc.language.isoenen
dc.publisherSpringerNatureen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectDissolved organic-matteren
dc.subjectaquatic metabolismen
dc.subjectstream metabolismen
dc.subjectfresh-wateren
dc.subjectrespirationen
dc.subjectoxygenen
dc.subjectphotosynthesisen
dc.subjectpatternsen
dc.subjectlakesen
dc.subjectphytoplanktonen
dc.titleHigh rates of daytime river metabolism are an underestimated component of carbon cyclingen
dc.title.serialCommunications Earth & Environmenten
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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