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A water level drawdown index for aquatic macrophytes in Nordic lakes
Norwegian Institute for Water Research (NIVA), Trondheim.
Finnish Environment Institute (SYKE), University of Oulu.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-4208-345X
2013 (Engelska)Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 704, nr 1, s. 141-151Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Many northern lakes are regulated to enhance hydropower production and flood protection. This bears hydromorphological pressures which are important factors causing lowered ecological status. Water level fluctuation triggers erosion on the shoreline and, depending on fluctuation range, also affects species composition or disappearance of sensitive aquatic macrophytes. We developed a water leveldrawdown index (WIc) for Nordic lakes using macrophytedata from 73 lakes with varying water level fluctuation in Finland, Norway and Sweden. The index is based on the ratio between sensitive and tolerant macrophyte species. The sensitive and tolerant species are identified based on a percentile approach, analysing the presence or absence of species along the winter drawdown range. The index correlates well with winter drawdown in Finnish and Norwegian lakes with strongest correlations with winter drawdown in storage lakes (lakes regulated for hydroelectric power and with a considerable winter drawdown). The WIcindex is applicable in low alkalinity, oligotrophic and ice-covered lakes, and is suggested to be a useful tool to identify and designate heavily modified water bodies in Nordic lakes according to the European Water Framework Directive.

Ort, förlag, år, upplaga, sidor
2013. Vol. 704, nr 1, s. 141-151
Nationell ämneskategori
Ekologi
Forskningsämne
Landskapsekologi
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URN: urn:nbn:se:ltu:diva-8396DOI: 10.1007/s10750-012-1323-6ISI: 000314693600010Scopus ID: 2-s2.0-84873716198Lokalt ID: 6e867779-9989-44e8-9da1-6f199a646270OAI: oai:DiVA.org:ltu-8396DiVA, id: diva2:981334
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Validerad; 2013; 20121015 (fawa)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

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