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– Vuojärvi (Finland) –

Lake name: Vuojärvi Country: Finland GIG Region: N
GIG Type: LN1 Lake code: 14.322.1.001 Altitude(m a.s.l.): 91
Area (km²): 0.73 Mean depth (m): N/A Mixing regime: Stratified
Alkalinity (m eq/l): 0.45 Retention time (yr): ---- Chlorophyll a (µg/l): 27
Total phosphorus (µg/l): 36 Eutrophication status: 3 - High Hydromorphological status: 2 - Medium

Description

A former clear water lake (Secchi depth 0.95 m) located in the city of Laukaa in central Finland. Lake Vuojärvi is largely eutrophicated as a consequence of agricultural activities and non-purified wastewaters. At present the water column of the lake is completely anoxic below the depth of 3 meters during the stratified period and the lake exhibits temporal mass occurrences of cyanobacteria in summer.
Eutrophication is seen in the aquatic macrophyte flora as a disappearance of large isoetids, which cannot tolerate increased sedimentation. Dense helophyte vegetation (Phragmites, Schoenoplectus lacustris, Typha latifolia) dominates littoral. High eutrophication is indicated by the floating plant Lemna minor. A limited number of limnological data is available from the lake since the mid 1970's. The fish community of at least eight species is dominated, typically for eutrophic lakes, by cyprinid fishes, mainly roach (Rutilus rutilus), but also bream (Abramis brama) and white bream (Abramis björkna) are abundant. All biological elements included in WISER are sampled in 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/vuojaervi/index.php [date: 2017/11/20]
© 2017 WISER (Contract No. 226273). All rights reserved.