Abstract
In 1994 the atmospheric deposition on three moorland pools in The Netherlands was only one third of its value in 1980. The effects of this reduction on these moorland pool ecosystems were examined by regular sampling of surface water chemistry and diatoms between 1979 and 1994. Moreover, diatom samples taken at irregular intervals between 1916 and 1978 were studied. In the pools Gerritsfles and Achterste Goorven, the median sulphate concentrations in 1994 were only one third of recorded values in 1980. Peak concentrations of sulphate were found after extremely dry summers. In the pool Kliplo, with an initially low concentration of sulphate, there was 16% increase of the concentration over the same period. Ammonium increased significantly in Kliplo and showed large variations in the other pools. Redundancy analysis showed that sulphate was the most important variable for the distribution of diatoms. As a consequence, the abundance of the acidification indicatorEunotia exigua in 1994 was only 25% of its value in 1980 in Achterste Goorven and 14% in Gerritsfles. Peaks ofE. exigua were found after drought periods. In Kliplo no clear change was observed. In 1994 the diatom assemblages of Achterste Goorven were much more similar to those of 1916–1925 than they were in 1980. In Gerritsfles a new situation, without historical analogue, developed. Overall, the large reduction of SOx-deposition had very positive consequences for the diatom assemblages.
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Van Dam, H. Partial recovery of moorland pools from acidification: Indications by chemistry and diatoms. Netherlands Journal of Aquatic Ecology 30, 203–218 (1996). https://doi.org/10.1007/BF02272240
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DOI: https://doi.org/10.1007/BF02272240