Zhytova O. Parasite-host relations in the system of trematodes - freshwater gastropods (under Ukrainian Polissya conditions

The thesis is an integrated research related to the system of trematode- freshwater gastropods on various levels of organization. It is for the first time in the region that 22 species ara found, 12 of which being new for Ukraine. The distribution of trematodes by the species of host mollusks is determined. The specific complexes of trematodes from various types of water reservoirs are analyzed. The dynamics of trematode cercariae emission is investigated. The correlation between the quantitative index of cercariae emission, the degree of invasion intensity and the character of the mollusk hepatopancreas affection is determined. The ecological components of the functioning of mollussks-trematodes system are revealed.