Action: Use lime to reduce acidification in lakes
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A before-and-after study from Sweden found no difference in osprey Pandion haliaetus productivity during a period of extensive liming of acidified lakes compared to two periods without liming.
Acid rain, caused by airborne pollutants such as sulphur dioxide and nitrogen oxides, can acidify lakes and reduce the number of fish they hold. Adding lime (calcium and magnesium-rich minerals) to lakes can help reduce acidity.
Supporting evidence from individual studies
A before-and-after study at three acidified lakes in southwest Sweden (Eriksson & Wallin 1994) found that the average number of large (over four week-old) osprey Pandion haliaetus nestlings produced in successful breeding attempts was not significantly different during a period of extensive liming of acidified lakes (1980–7), compared to either of two periods without liming (1961-71: 2.0 nestlings/successful breeding attempt; 1972-9: 2.0 nestlings/successful attempt; 1980-7: 1.9 nestlings/successful attempt).