The multivariate relationship between phytoplankton abundance and different factors both natural and generated by oil shale mining in the Purtse catchment rivers (Purtse, Kohtla, and Ojamaa) in Augusts 1996-2000 was studied. Impact of oil shale mine water discharges, causing the input of sulfates and chlorides into the rivers, on phytoplankton abundance in river water was characterized by significant negative linear correlation. The amount of annual precipitation influenced positively the characteristics of phytoplankton abundance in river water. The complex of linear regression formulas was derived for characterising phytoplankton abundance in the lower course of the Purtse River using meteorological, hydrological and hydrogeological as well as geochemical data of water circulation.Closing the Sompa, Tammiku and Kohtla mines in 2000-2001 decreased essentially anthropogenic stress on ecological condition of the Purtse catchment rivers.
Underground mining of oil shale in northeastern Estonia causes changes in the exterior of the local landscape in the form of depressions with a depth up to 1.7 metres. As a result of the changing water regime (formation of small water-bodies and marshy areas) the environmental conditions in subsided areas will be affected as well, influencing the development and alternation of local plant communities. Researches and surveys in the subsided area, which was formed 20 years ago in the area of room-andpillar mining, prove that the former forest has become a poor fen that may further develop to a swamp forest or a transitional bog forest. The affected areas are of great interest from the viewpoint of landscape diversity.
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