Helminth communities of grass snake Natrix natrix L. (Reptilia: Colubridae) from south of Middle Volga area

In 1996-2001 helminthological dissection of 232 grass snakes in various areas of the Samara region has been made. 20 species of helminthes (15 - trematodes, 1 - cestodes, 1 - acanthocephalans, 3 - nematodes) are registered at a snake. Characteristics of parasite communities the different order are resulted. Laws of formation and functioning of helminth communities of reptile are revealed. The analysis of composition of helminth communities from grass snake in areas of the Samara area with a different degree of anthropogenous influence is made. The original method of integrated estimation of a condition of natural ecosystems based on change of structure of helminthes community of grass snake is offered.