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Trade-offs Between Light and Nutrient Availability Across Gradients of Dissolved Organic Carbon Lead to Spatially and Temporally Variable Responses of Lake Phytoplankton Biomass to Browning
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. Department of Aquatic Ecology, Eawag-Swiss Federal Institute of Aquatic Sciences, Dübendorf, Switzerland.ORCID-id: 0000-0003-4446-6788
School of Environment and Sustainability, University of Saskatchewan, SK, Saskatoon, Canada.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. (Arcum)
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. (Arcum)ORCID-id: 0000-0001-5102-4289
2021 (Engelska)Ingår i: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 24, nr 8, s. 1837-1852Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Northern lakes are experiencing widespread increases in dissolved organic carbon (DOC) that are likely to lead to changes in pelagic phytoplankton biomass. Pelagic phytoplankton biomass responds to trade-offs between light and nutrient availability. However, the influence of DOC light absorbing properties and carbon–nutrient stoichiometry on phytoplankton biomass across seasonal or spatial gradients has not been assessed. Here, we analyzed data from almost 5000 lakes to examine how the carbon–phytoplankton biomass relationship is influenced by seasonal changes in light availability, DOC light absorbing properties (carbon-specific visual absorbance, SVA420), and DOC–nutrient [total nitrogen (TN) and total phosphorus (TP)] stoichiometry, using TOC as a proxy for DOC. We found evidence for trade-offs between light and nutrient availability in the relationship between DOC and phytoplankton biomass [chlorophyll (chl)-a], with the shape of the relationship varying with season. A clear unimodal relationship was found only in the fall, particularly in the subsets of lakes with the highest TOC:TP. Observed trends of increasing TOC:TP and decreasing TOC:TN suggest that the effects of future browning will be contingent on future changes in carbon–nutrient stoichiometry. If browning continues, phytoplankton biomass will likely increase in most northern lakes, with increases of up to 76% for a 1.7 mg L−1 increase in DOC expected in subarctic regions, where DOC, SVA420, DOC:TN, and DOC:TP are all low. In boreal regions with higher DOC and higher SVA420, and thus lower light availability, lakes may experience only moderate increases or even decreases in phytoplankton biomass with future browning.

Ort, förlag, år, upplaga, sidor
Springer, 2021. Vol. 24, nr 8, s. 1837-1852
Nyckelord [en]
Boreal, Browning, Chlorophyll-a, DOC, DOC:TN, DOC:TP, Lake, Stoichiometry, Subarctic, Sweden
Nationell ämneskategori
Ekologi Miljövetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-182175DOI: 10.1007/s10021-021-00619-7ISI: 000632792900004Scopus ID: 2-s2.0-85103204629OAI: oai:DiVA.org:umu-182175DiVA, id: diva2:1544561
Tillgänglig från: 2021-04-15 Skapad: 2021-04-15 Senast uppdaterad: 2022-01-12Bibliografiskt granskad

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Isles, Peter D. F.Jonsson, AndersBergström, Ann-Kristin

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