COMPLEX INFLUENCE OF DESICATION AND HELMINTHS ON THE TROPHOLOGICAL INDICES OF PLANORBARIUS CORNEUS (MOLLUSCA, GASTROPODA, BULINIDAE)

Abstract

This article focuses on the complex influence of the desication in various
duration (6, 12, 18, 24, 30 days) and the impact of mothernal and daughternal
rediae Notocotylus thienemanni and sporocysts Bilharziella polonica on the two
main trophological indices of Planorbarius corneus. These are the mean quantity
of daily rathion and the duration of feed advancenment.
The research shows that both these factors, depending on the level of their
expressiveness, put definite pressure on the mollusks organism and its
physiological status, including the mean quantity of daily rathion and the duration
of food advancenment. The most negative influence on the both trophological
indices of P. corneus render the sporocyst B. polonica and mothernal daughternae
rediae N. thienemanni.
Keywords: Planorbarius corneus, Trematoda, desication, daily rathion, food
advancenment.