[Effects of abiotic factors (temperature, pH, heavy metals) on activities of glycosidases in invertebrate animals].

We have established differences in amylolytical activity in the whole organisms of several invertebrate animals (larvae of chironomids Chironomnus plumosus, pond snail Limnaea stagnalis, orb snail Planorbis corneus, faucet snail Bithynia tentaculata, and zebra mussel Dreissena polymorpha)--potential objects of nutrition of fish benthophages under separate and combined actions of temperature (0, 10 or 20 degrees C), pH (5.0, 7.4 or 8.3), and ions of heavy metals (copper, zinc at a concentration of 10 mg/l) in vitro. The strongest inhibitory effect on the amylolytical activity in tissues of the studied animals was produced by a combination of the low temperature, acidic pH values, and the presence of the heavy metal ions. Enzymes of chironomids were more resistant to action of the studied agents as compared with mollusks.