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Vesijärvi

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Location
  
Päijänne Tavastia

Max. length
  
25 km (16 mi)

Max. depth
  
42 m (138 ft)

Surface elevation
  
81 m

Mean depth
  
6 m

Cities
  
Lahti, Asikkala

Basin countries
  
Finland

Average depth
  
6 m (20 ft)

Area
  
107.6 km²

Shore length
  
181 km

Length
  
25 km

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Surface area
  
107.57 km (41.53 sq mi)

Vesijärvi is a lake of 111 square kilometres (43 sq mi) near Lahti in southern Finland. It suffered severe effects of eutrophication in the 1960s and a restoration programme began in the 1970s. The Enonselkä Basin is a part of Vesijärvi.

Contents

Map of Vesijarvi, 17120 Hollola, Finland

The name of the lake means The Water Lake.

Cyanobacteria Bloom RemediationEdit

  • Biomanipulation is an approach that applies the top-down model of community organization to alter ecosystem characteristics.
  • Ecologists used cyanobacteria blooms as an alternative to using chemical treatments.
  • Lake Vesijärvi was polluted by city sewage and industrial wastewater until 1976, at which point pollution controls reduced these inputs. By 1986 massive blooms of cyanobacteria began occurring, as well as dense populations of roach, a fish that benefited from the pollution's mineral nutrients. Roach eat zooplankton that otherwise keep cyanobacteria in check. To remediate this problem, ecologists removed about a million of kilograms of fish, reducing roach to 20% of their former abundance, between 1989 and 1994, and stocked the lake with pike perch which eats roach. The water has since become clear, and the last cyanobacteria bloom was in 1989.
  • The ninth track on Geographer's 2012 album Myth is titled "Vesijärvi".

    • References

    Vesijärvi Wikipedia
    (Text) CC BY-SA