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Dissolved organic carbon bioreactivity and DOC:DIN stoichiometry control ammonium uptake in an intermittent Mediterranean stream

Peñarroya, Xavier; Lupon, Anna; Triadó-Margarit, Xavier; Martí, Eugènia; Ledesma, José L. J. ORCID iD icon 1; Ribot, Miquel; Soler, Montserrat; Casamayor, Emilio O.; Bernal, Susana
1 Institut für Geographie und Geoökologie (IFGG), Karlsruher Institut für Technologie (KIT)

Abstract:

1. Heterotrophic organisms in streams use dissolved organic carbon (DOC) and dissolved inorganic nitrogen (DIN) from the water column to meet their growth and energy requirements. However, the role of DOC availability in driving DIN uptake in headwater streams is still poorly understood. In this study, we focus on how DOC:DIN stoichiometry and DOC bioreactivity control ammonium (NH$_4$$^+$) uptake and heterotrophic aerobic respiration, and how this influence varies among seasons in a forested Mediterranean headwater stream.
2. We estimated in-stream NH$_4$$^+$ uptake rates seasonally by conducting whole-reach constant-rate additions of NH$_4$$^+$ with and without amendments of either lignin (recalcitrant DOC) or acetate (labile DOC). During each addition, we characterised microbial community composition by molecular analyses, stream metabolism with the single-station method, and heterotrophic aerobic respiration by adding a metabolic tracer (resazurin).
3. The stream was heterotrophic (net ecosystem production <0) regardless of the season, with a microbial community mostly composed of heterotrophic bacteria. In-stream NH$_4$$^+$ uptake rates were not related to either background NH$_4$$^+$ or DOC concentrations. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000161415
Veröffentlicht am 16.08.2023
Originalveröffentlichung
DOI: 10.1111/fwb.14152
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 0046-5070, 1365-2427
KITopen-ID: 1000161415
Erschienen in Freshwater Biology
Verlag John Wiley and Sons
Band 68
Heft 9
Seiten 1572–1587
Vorab online veröffentlicht am 25.07.2023
Schlagwörter dissolved organic carbon availability, heterotrophic activity, in-stream nitrogen uptake, stream biofilms, stream metabolism
Nachgewiesen in Web of Science
Dimensions
Scopus
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