Erastvere ( est. Erastvere ) is a valley eutrophic sewage lake located in southeastern Estonia ( Põlvamaa county), in the village of Erastvere in the Kanepi parish. From the lake Erastvere originates the river Achya [1] [2] .
| Lake | |
| Erastvere | |
|---|---|
| est. Erastvere | |
 | |
| Morphometry | |
| Square | 0.163 km² |
| Coastline | 1904 km |
| Deepest | 9.7 m |
| Average depth | 3,5 m |
| Pool | |
| Flowing river | Ahya |
| Location | |
| A country |
|
| County | Pylvamaa |
| Municipality | Kanepi |
Physico-geographical characteristics
The lake is located on the hill of Otepää. It belongs to the old lakes of Estonia, whose development began in the Pleistocene [3] .
The lake has an oblong shape, elongated from the southwest to northeast. The north-eastern part of the lake is more elongated than the south-western [3] .
The length of the reservoir is 829 m, the greatest width is 290 m. The average depth of the lake is 3.5 m [2] .
Flora and Fauna
The amount of phytoplankton in the lake is from medium to high. In the samples obtained during the flowering of blue-green algae , 62 taxa were found. In open water, blue-green algae dominated. The number of green algae increased in the coastal zone, but blue-green algae remained the dominant species [3] .
The amount of zooplankton is average. As a result of the research of A. Määmets of 1958, 18 species were found in the lake. In open water and in the coastal zone, branched crayfish dominated [3] .
The number of plants is average. A total of 17 species of macrophytes were found, growing on a third of the lake area. The maximum depth at which plants grow is 2.2 meters [3] .
The fish fauna is rich in species. Here are found perch, bream, roach, pike and tench [1] [3] .
Notes
- ↑ 1 2 Eesti nõukogude entsüklopeedia, 1987 , p. 590.
- ↑ 1 2 Keskonnaregister .
- ↑ 1 2 3 4 5 6 Eesti järved, 1968 , pp. 41-42.
Literature
- Eesti nõukogude entsüklopeedia / Gustav Naan . - Tallinn: Valgus, 1987. - T. 2. - S. 590. - 704 p.
- Eesti järved / A. Mäemets. - Tallinn: Valgus, 1968 .-- S. 41-42. - 548 p.
Links
- Erastvere järv (est.) . Keskonnaregister. Date of treatment October 5, 2015.