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| 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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