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Spatial and temporal changes of benthic macroinvertebrate assemblages in acidified streams in the Bohemian Forest Czech Republic



Spatial and temporal changes of benthic macroinvertebrate assemblages in acidified streams in the Bohemian Forest Czech Republic



Aquatic Insects 34(sup1): 157-172



Outflows from two atmospherically acidified lakes in the Bohemian Forest were studied in 25 and 27. While Lake ?ertovo has been strongly acidified (?pH 4.6), Lake Laka was only slightly acidified in the past and is recovering now (?pH 5.2). The water chemistry and macrozoobenthos composition were analysed along longitudinal gradients of both lake outflows to determine the present status of their streams. A certain progression in stream chemistry to more neutral conditions was observed along the longitudinal gradients of both streams. However, a possible recovery of macrozoobenthos was evident only in the Lake Laka outflow, mainly via an increasing number of Ephemeroptera and Trichoptera taxa, and an increasing number of Gammarus fossarum, both along the longitudinal gradient and during the period of study. In contrast, no considerable changes were observed in the macrozoobenthos composition of the Lake ?ertovo outflow, presumably because its chemistry was harmful for acidosensitive taxa such as Epheme.

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Accession: 036503118

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DOI: 10.1080/01650424.2012.643048



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