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Compensatory nutrient enrichment in an oligotrophicated mountain reservoir - effects and fate of added nutrients
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
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2008 (English)In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 70, no 3, 323-336 p.Article in journal (Refereed) Published
Abstract [en]

Most Scandinavian rivers are impounded for power production. High altitude reservoirs retain water during summer and fall for power production during winter and spring. The oligotrophic lakes Mjolkvattnet and Burvattnet were impounded in 1942. Annual water level fluctuations caused by regulation have resulted in a loss of littoral habitat, and Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) populations have declined. To assess compensatory nutrient enrichment as a remedy against declining fish populations, we added dissolved phosphate and nitrate to Mjolkvattnet in June and July in 2002 and 2003, and used the upstream lake Burvattnet as a reference system. Nutrient addition doubled water column total phosphorus concentration, from 3 to 6 mu g P/L and increased nitrogen concentration by about 20 mu g/L. Half of the added phosphorus settled out as organic matter, and about one third was lost downstream. Phytoplankton production and biomass increased, but species composition remained principally unchanged. Rotifers and cladocerans responded rapidly, as did the condition of fish. After two years of nutrient addition, five year old Arctic char had doubled in weight and increased significantly in length, reaching pre-impoundment conditions.

Place, publisher, year, edition, pages
2008. Vol. 70, no 3, 323-336 p.
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:miun:diva-7248DOI: 10.1007/s00027-008-8061-xISI: 000258704000011Scopus ID: 2-s2.0-50649084532OAI: oai:DiVA.org:miun-7248DiVA: diva2:127101
Note
VR-BiologyAvailable from: 2008-11-30 Created: 2008-11-30 Last updated: 2011-04-06Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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