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Spatiotemporal patterns of N2 fixation in coastal waters derived from rate measurements and remote sensing
Marine Research Institute, Klaipeda University, Klaipeda, Lithuania.
Marine Research Institute, Klaipeda University, Klaipeda, Lithuania.
Marine Research Institute, Klaipeda University, Klaipeda, Lithuania.
Marine Research Institute, Klaipeda University, Klaipeda, Lithuania.
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2021 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 18, no 5, p. 1857-1871Article in journal (Refereed) Published
Abstract [en]

Coastal lagoons are important sites for nitrogen (N) removal via sediment burial and denitrification. Blooms of heterocystous cyanobacteria may diminish N retention as dinitrogen (N2) fixation offsets atmospheric losses via denitrification. We measured N2 fixation in the Curonian Lagoon, Europe's largest coastal lagoon, to better understand the factors controlling N2 fixation in the context of seasonal changes in phytoplankton community composition and external N inputs. Temporal patterns in N2 fixation were primarily determined by the abundance of heterocystous cyanobacteria, mainly Aphanizomenon flos-aquae, which became abundant after the decline in riverine nitrate inputs associated with snowmelt. Heterocystous cyanobacteria dominated the summer phytoplankton community resulting in strong correlations between chlorophyll a (Chl a) and N2 fixation. We used regression models relating N2 fixation to Chl a, along with remote-sensing-based estimates of Chl a to derive lagoon-scale estimates of N2 fixation. N2 fixation by pelagic cyanobacteria was found to be a significant component of the lagoon's N budget based on comparisons to previously derived fluxes associated with riverine inputs, sediment–water exchange, and losses via denitrification. To our knowledge, this is the first study to derive ecosystem-scale estimates of N2 fixation by combining remote sensing of Chl a with empirical models relating N2 fixation rates to Chl a.

Place, publisher, year, edition, pages
Copernicus Publications , 2021. Vol. 18, no 5, p. 1857-1871
National Category
Environmental Sciences Oceanography, Hydrology and Water Resources
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URN: urn:nbn:se:umu:diva-182003DOI: 10.5194/bg-18-1857-2021ISI: 000631086800001Scopus ID: 2-s2.0-85103018743OAI: oai:DiVA.org:umu-182003DiVA, id: diva2:1542112
Available from: 2021-04-06 Created: 2021-04-06 Last updated: 2023-09-05Bibliographically approved

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Andersson, AgnetaBrugel, Sonia

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