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– Iso-Jurvo (Finland) –

Lake name: Iso-Jurvo Country: Finland GIG Region: N
GIG Type: LN2a Lake code: 14.418.1.004_001 Altitude(m a.s.l.): 138
Area (km²): 2.0 Mean depth (m): 8.6 Mixing regime: Stratified
Alkalinity (m eq/l): 0.08 Retention time (yr): 4.8 Chlorophyll a (µg/l): 2.65
Total phosphorus (µg/l): 5.5 Eutrophication status: 1 - Low Hydromorphological status: 2 - Medium

Description

A typical clear water oligotrophic lake (Secchi depth 3.5 m; August 2009) representing botanically Lobelia-type of lakes situated at sandy areas. Despite some scattered settlements around the lake, the lake represents reference conditions. Flourishing macrophytic vegetation consists of large isoetids (Lobelia dortmanna, Isoetes lacustris, Isoetes echinospora) typical for reference lakes.

At sheltered shores you can find also helophytes Phragmites australis and Equisetum fluviatile with floating leaved vegetation like Nuphar lutea. A limited number of limnological data is available from the lake since the early 1970's. The fish community includes at lest seven species, vendace (Coregonus albula) and bullhead (Cottus gobio) indicating good environmental conditions of an oligotrophic lake. All biological elements included in WISER are sampled in the lake.

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WISER: "Water bodies in Europe: Integrative Systems to assess Ecological status and Recovery"
Online: http://www.wiser.eu/programme/lake-assessment/sampling-sites/iso-jurvo/index.php [date: 2017/09/22]
© 2017 WISER (Contract No. 226273). All rights reserved.