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Effects of N: P loading ratios on phytoplankton community composition, primary production and N fixation in a eutrophic lake
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2009 (English)In: Freshwater Biology, Vol. 54, no 2, p. 331-344Article in journal (Refereed) Published
Abstract [en]

1. The aim of this study was to assess the effects of different nitrogen (N) to phosphorus (P) loading ratios on phytoplankton community composition and primary production in a naturally eutrophic lake. Furthermore, the sources of N fuelling primary production were estimated using (15)N stable isotope tracers.2. A mesocosm experiment was performed with the same amount of P added to all mesocosms (similar to internal loading rates) but with a range of N additions (0-86 mu m N), resulting in a gradient of N : P supply ratios.3. Low N : P supply ratios resulted in a significant shift in the phytoplankton assemblage to a community dominated by N-fixing cyanobacteria and a supply of atmospheric N(2) estimated to be up to 60% of total supply.4. The N : P loading ratio had no significant effect on primary production, total nitrogen (TN) concentration or particulate N concentration.5. Our results imply that a reduced N : P ratio of the nutrient load does not necessarily result in a lower TN concentration and downstream N export due to compensation by N-fixing cyanobacteria.

Place, publisher, year, edition, pages
Blackwell Publishing Ltd , 2009. Vol. 54, no 2, p. 331-344
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-130857OAI: oai:DiVA.org:umu-130857DiVA, id: diva2:1070162
Note

394TITimes Cited:5Cited References Count:51394TITimes Cited:7Cited References Count:51

Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2018-06-09

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http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2427.2008.02118.x/full

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Gudasz, Cristian

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