Indexed on: 17 Mar '15Published on: 17 Mar '15Published in: Inland Water Biology
Data on the water chemical composition and species composition of periphyton algae have been analyzed in 25 rivers under different rates of anthropogenic impact in Primorskii krai, Russia. It is shown that chemical oxygen demand and the content of ammonium compounds of dissolved nitrogen are the most definite indicators of total anthropogenic impact. In the Razdol’naya River, which as the greatest anthropogenic eutrophication, it may be also indicated by organic compounds of dissolved phosphorus and nitrates. The number and biomass of periphyton algae varies considerably even within similar water streams. The alga species composition and the saprobity index calculated on its basis are more stable. The saprobity index is characterized by less spatial variability when compared to the chemical composition of river water. Nevertheless, there is a correlation between the saprobity index and the content of ammonium nitrogen, as well as between the saprobity index trend within the last 20 years and input of contaminants into the Razdol’naya River.