Table 5.17 - Examples of European lakes in which phosphorus concentration has decreased during the last 10 to 20 years
Country* | Lake(s) | Period | Reduction in in-lake phosphorus level (%) |
---|---|---|---|
Europe1,2 | 9 deep lakes | Mid-1970s to late 80s | 51 |
Europe1,2 | 9 shallow lakes | Mid-1970s to late 80s | 63 |
DK3 | 46 lakes | 197279 to 198589 | 33 |
SE4 | Vättern | 1962 to 86 | 57 |
CH5 | Zürichsee | 1979 to 88 | 31 |
CH5 | Walensee | 1979 to 88 | 92 |
AT, CH, DE5,6 | Bodensee | 1979 to 89 | 45 |
CH, FR7 | Lac Léman | 1976 to 89 | 36 |
CH, IT8 | Lago di Lugano | 1984 to 90 | 32 |
IT9 | Lago Maggiore | 1977 to 88 | 46 |
AT10 | Mondsee | 1979 to 89 | 70 |
NO11 | Mjøsa | Early 1970s to 1991 | 39 |
* See Table 5.9 for country codes.