Abstract
Total aluminium, pH and water colour were measured over two years in three lakes of different pH in an area undergoing anthropogenic acidification in southern Norway. Al content decreased in Ca-rich lakes near the coast, but also with increasing organic content of the lakes. Seasonal variation was pronounced in the most acidic lake. Al concentration seems virtually independent of pH, suggesting that it is in the form of organic complexes, at least in the two most coloured lakes. Precipitation processes affecting fish metabolism in the acidic lakes with high Al content may have caused the frequent lack of success in liming lakes in this area. Similarily, humic acidic lakes with organic complexed Al still carry considerable fish biomass.
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