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There are more than 2,000 lakes in Italy: 389 of these are freshwater (natural, enlarged natural and reservoirs) and 104 are coastal with brackish water, excluding lagoons. 147 of these are aquatic environments (87 lakes and 60 reservoirs) have been classified according to the OECD criteria (Ministry of the Environment, 1997). Phosporus is mainly responsible for the eutrophication process because it is the limiting factor in 85% of examined lakes. On the basis of OECD boundary values for phosphorus, chlorophyll a and transparency, only 19% of lakes and reservoirs are presently in oligotrophic conditions; 40% are to be classified as mesotrophic, and 41% as eutrophic. Among these, 10% are to be considered as hypertrophic.

Additional information

Authors: PASSINO R, PO RIVER AUTHORITY BASIN, PARMA (IT);CHIADANI G, Biology Department (Milan (IT);GIOVANARDI F, Consorzio Ital copo, Parma (IT);PREMAZZI G, EI, JRC-Ispra (IT)
Bibliographic Reference: Paper presented: 8th International Conference on the Conservation and Management of Lakes, Copenhagen (DK), 17-21st May (1999)
Availability: Available from Public Relations and Publications Unit, Ispra (IT)
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