VTechWorks staff will be away for the Thanksgiving holiday beginning at noon on Wednesday, November 27, through Friday, November 29. We will resume normal operations on Monday, December 2. Thank you for your patience.
 

Gradients of Anthropogenic Nutrient Enrichment Alter N Composition and DOM Stoichiometry in Freshwater Ecosystems

Simple item page
dc.contributor.authorWymore, Adam S.en
dc.contributor.authorJohnes, Penny J.en
dc.contributor.authorBernal, Susanaen
dc.contributor.authorBrookshire, E. N. Jacken
dc.contributor.authorFazekas, Hannah M.en
dc.contributor.authorHelton, Ashley M.en
dc.contributor.authorArgerich, Albaen
dc.contributor.authorBarnes, Rebecca T.en
dc.contributor.authorCoble, Ashley A.en
dc.contributor.authorDodds, Walter K.en
dc.contributor.authorHaq, Shahanen
dc.contributor.authorJohnson, Sherri L.en
dc.contributor.authorJones, Jeremy B.en
dc.contributor.authorKaushal, Sujay S.en
dc.contributor.authorKortelainen, Pirkkoen
dc.contributor.authorLopez-Lloreda, Carlaen
dc.contributor.authorRodriguez-Cardona, Bianca M.en
dc.contributor.authorSpencer, Robert G. M.en
dc.contributor.authorSullivan, Pamela L.en
dc.contributor.authorYates, Christopher A.en
dc.contributor.authorMcDowell, William H.en
dc.date.accessioned2021-11-17T13:36:52Zen
dc.date.available2021-11-17T13:36:52Zen
dc.date.issued2021-08en
dc.description.abstractA comprehensive cross-biome assessment of major nitrogen (N) species that includes dissolved organic N (DON) is central to understanding interactions between inorganic nutrients and organic matter in running waters. Here, we synthesize stream water N chemistry across biomes and find that the composition of the dissolved N pool shifts from highly heterogeneous to primarily comprised of inorganic N, in tandem with dissolved organic matter (DOM) becoming more N-rich, in response to nutrient enrichment from human disturbances. We identify two critical thresholds of total dissolved N (TDN) concentrations where the proportions of organic and inorganic N shift. With low TDN concentrations (0-1.3 mg/L N), the dominant form of N is highly variable, and DON ranges from 0% to 100% of TDN. At TDN concentrations above 2.8 mg/L, inorganic N dominates the N pool and DON rarely exceeds 25% of TDN. This transition to inorganic N dominance coincides with a shift in the stoichiometry of the DOM pool, where DOM becomes progressively enriched in N and DON concentrations are less tightly associated with concentrations of dissolved organic carbon (DOC). This shift in DOM stoichiometry (defined as DOC:DON ratios) suggests that fundamental changes in the biogeochemical cycles of C and N in freshwater ecosystems are occurring across the globe as human activity alters inorganic N and DOM sources and availability. Alterations to DOM stoichiometry are likely to have important implications for both the fate of DOM and its role as a source of N as it is transported downstream to the coastal ocean.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesThis work was conducted as a part of the Stream Elemental Cycling Synthesis Group funded by the National Science Foundation (NSF) under grant DEB#1545288, through the Long-Term Ecological Research Network Office (LNO), National Center for Ecological Analysis and Synthesis (NCEAS), University of California-Santa Barbara. The authors acknowledge the efforts of Julien Brun for assistance with data synthesis and the efforts of multiple individuals who collected and analyzed samples. Partial support for ASW during data synthesis and manuscript preparation was provided by NSF grant DEB#1556603 (Deciphering Dissolved Organic Nitrogen). Partial funding was provided by the New Hampshire Agricultural Experiment Station. This is Scientific Contribution 2880. This work was supported by the USDA National Institute of Food and Agriculture McIntire-Stennis Project 1006760. Support for AA was provided by the USDA National Institute of Food and Agriculture McIntire-Stennis Project 1016163. Partial support for PJJ and CAY was provided by Natural Environment Research Council, UK Large Grant NE/K010689/1 (DOMAINE: Characterizing the Nature, Origins and Ecological Significance of DOM in Freshwater Ecosystems). The authors are also grateful for feedback from two anonymous reviewers whose comments significantly improved this manuscript. This paper is dedicated to the memory of Dr. John Schade, a friend, colleague, and mentor to many of us. John studied ecological stoichiometry in freshwater ecosystems and led the Long-Term Ecological Research (LTER) group at the US National Science Foundation.en
dc.description.sponsorshipNational Science Foundation (NSF) through the Long-Term Ecological Research Network Office (LNO), National Center for Ecological Analysis and Synthesis (NCEAS), University of California-Santa Barbara [1545288]; NSFNational Science Foundation (NSF) [1556603]; New Hampshire Agricultural Experiment Station; USDA National Institute of Food and Agriculture McIntire-Stennis Project [1006760, 1016163]; Natural Environment Research Council, UK Large Grant [NE/K010689/1]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2021GB006953en
dc.identifier.eissn1944-9224en
dc.identifier.issn0886-6236en
dc.identifier.issue8en
dc.identifier.othere2021GB006953en
dc.identifier.urihttp://hdl.handle.net/10919/106665en
dc.identifier.volume35en
dc.language.isoenen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectitrogen cycleen
dc.subjecttotal dissolved nitrogenen
dc.subjectdissolved organic matteren
dc.subjectdissolved organic carbonen
dc.subjectdissolved organic nitrogenen
dc.subjectstoichiometryen
dc.subjectfreshwater ecosystemsen
dc.titleGradients of Anthropogenic Nutrient Enrichment Alter N Composition and DOM Stoichiometry in Freshwater Ecosystemsen
dc.title.serialGlobal Biogeochemical Cyclesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
2021GB006953.pdf
Size:
1.23 MB
Format:
Adobe Portable Document Format
Description:
Published version
Download

Collections

Scholarly Works, Biological Sciences
Destination Area: Global Systems Science (GSS)