EVALUATION OF COMMON RIVER SNAIL VIVIPARUS VIVIPARUS (L.) FILTRATION ACTIVITY BY THE INDICATOR OF CHLORELLA CULTURE OPTICAL DENSITY

Abstract

The role of natural self-purification processes aimed at restoring water original properties and composition increases in conditions of high anthropogenic pressure on freshwater ecosystems. A significant contribution to these processes is made by filter-feeding hydrobionts, which can deposit suspended particles from water column. A main part of the research in this area is devoted to filter-feeding mollusks – bivalves and gastropods, but gastropods are less studied. The data obtained during the experimental study of the filtration activity effect of the river Viviparus viviparus (L.) on the change in the optical density of the suspension of the unicellular algae Chlorella sp. are presented in this pa-per. The results showed that the average value of optical density of Сhlorella suspension in the presence of the mol-lusk decreased by 2 times, from (0.151 ± 0.0090) to (0.068 ± 0.0400) B. Various changes in optical density in each of the experimental glasses are associated primarily with the unequal physiological state of the mollusks. It was sug-gested that numerous populations formed as a result of V. viviparus invasion into the Novosibirsk Reservoir are able to change water quality, potentially affecting the functioning of the reservoir ecosystem.