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The article is devoted to the determination of anthropogenic impact on the Siret River and its tributaries (the Sukhyj, the Mikhidra and the Malyj Siret Rivers). The taxons of attached algae were determined in this case. Then they were distributed in the saprobity groups and the correlation of each group was found. It was necessary to identify the stage of ecological regress on each site of the researched...
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