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Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive Swedish lakes along a gradient of atmospheric nitrogen deposition
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
2008 (Engelska)Ingår i: Aquatic Biology, ISSN 1864-7782, E-ISSN 1864-7790, Vol. 4, s. 55-64Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Lake sampling and in situ nutrient enrichment enclosure experiments with nitrogen (N) and phosphorus (P) were conducted in unproductive Swedish lakes along a gradient of increasing atmospheric N-deposition. The regional and seasonal patterns of nutrient limitation of phytoplankton were clearly related to the amounts of N-deposition and N-inputs the lakes received. In areas of low N-deposition in northern Sweden, N-limitation of phytoplankton was evident throughout the summer season due to high catchment N-retention and very low dissolved inorganic N (DIN) inputs during the early summer. High N-deposition in the south was accompanied by high lake DIN-concentrations during the early summer and subsequent P-limitation of phytoplankton. However, P-limitation did not persist over the summer and, as a consequence of a declining DIN-pool, the lakes switched to dual- and co-limitation by N and P, and then to N-limitation. Generally, the lakes were N-limited rather than P-limited during the summer. We conclude that N-limitation is probably a natural state of the unproductive lakes studied, but P-limitation of variable intensity and duration has been induced by elevated atmospheric N-deposition.

Ort, förlag, år, upplaga, sidor
2008. Vol. 4, s. 55-64
Nyckelord [en]
N-limitation, P-limitation, Phytoplankton, Lakes, N-deposition, Seasonal variation, Nutrients
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:umu:diva-11352DOI: 10.3354/ab00099ISI: 000262027800007Scopus ID: 2-s2.0-70449345276OAI: oai:DiVA.org:umu-11352DiVA, id: diva2:151023
Tillgänglig från: 2008-12-16 Skapad: 2008-12-16 Senast uppdaterad: 2020-02-28Bibliografiskt granskad

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Bergström, Ann-KristinJonsson, AndersJansson, Mats

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Aquatic Biology
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