Demidenko L. Consortive ties of Phoca caspica with its helmintofauna in ecosystem of Caspian Sea.

The objects are caspian seals and them parasites helmints-consorts. The aim is to study the Consortive ties of the Caspian seal with its helmints fauna. Methods - incomplete and complete openings, gistopathological, mathematical statistics. It has been shown that caspial seal has a complex web of trophic ties and plays a role of third, fourth or fifth link in a range of trophic chains of the Caspian Sea ecosystem. Twenty three helminte species belong to its consorts, among them tremathodes are major. Only one helminte species was found in mero-consortions of liver, gall-bladder and pancreatic gland. Ten helminte species infect mero-consortion of small intestine. Two species were found in stomach and three species were found in large intestine. Helmints-consorts evoke deep pathomorphological alterations, which cause violation of metabolic processes in the mero-consortions of liver, gall-bladder, pancreatic gland and stomach. Non-simple trends in weight accumulation were pointed in relation to occuranceof one or another helmints-consorts in the seal organs. Consortive ties confirm the species differentiation into northern an southern populations. Within the northern population consortive ties clearly mark threе seal sub-populations, each of them has an unique helminte set. The consortive ties confirm the hypothesis of the Caspian seal autochthonous origin. Sphere of use is the training courses.