Abstract
Benthic macroinvertebrates and epilithic diatoms were surveyed in six forest spring brooks of Saxonia-Anhalt and Saxonia (eastern Germany). The aquatic communities changed from acid-sensitive to acid-tolerant along a gradient of acidity within the sampling area. The acidity states of the brooks were assessed by indicator species and pH values measured weekly. Waters close to industrial emitters showed lower acidity states than those farther from them. The different assessment methods used tended to yield corresponding results. In some cases, however, the results were not congruent, particularly when macroinvertebrates were used. Possible modifications of acidity-indication evaluation systems are discussed which may lead to improved assessments.
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