The water quality at Lago di Vico during 1992–1993

A small monomictic, volcanic lake, Lago di Vico in Central Italy, was studied intensively for one calendar year 1992–1993 for its water quality and phytoplankton. The results were compared with those obtained 20 years before. A significant increase in nutrients such as orthophosphates and nitrates was found to have taken place during 1971–1991. Also, eutrification can be seen by the appearance of several algal species characterizing the present mesotrophic stage of the lake, while in 1971 it was classified as an oligotrophic lake.