MODERN DISTRIBUTION OF NEMATODES P. SYPHACIA (NEMATODA, OXYURIDAE) IN POPULATIONS OF MOUSE-LIKE RODENTS IN THE VORONEZH RESERVE

Abstract

The mouse-like rodents, inhabiting natural and anthropogenic biocenoses, are sources and distributors of various helminth infections, including syphaciosis. Currently, more than ten species of nematodes of the genus Syphacia are registered in mouse-like rodents. Syphacia exhibit narrow, guest specificity, parasitizing, as a rule, in one or three species of mouse-like rodents. The main sources of infection of rodents by these nematodes are vegetable feed, soil, forest litter. We have presented long-term (2000-2018) results of helminthological studies of mouse-like rodents, conducted in the Voronezh Reserve. At present, in the territory of mouse-like rodents, 5 species of Syphacia are registered: Syphacia agraria, S. obvelata, S. nigeriana, S. petrusewiczi, S. stroma. Taxonomic diagnosis of nematodes was carried out taking into account the guest specificity, localization in the host intestine, morphometric data, and also taking into account the structural features of the nematode head end. Nematodes of syphacia are noted in 7 host species: Mus musculus, Apodemus agrarius, Sylvemus flavicollis, Sylvemus uralensis, Myodes glareolus, Microtus agrestis, Microtus arvalis. The extensiveness of invasion ranges from 6 to 51% (on average, 30%).The study area is located in a densely populated region of the Central Black Earth region of Russia. Here, at the junction of natural and anthropogenic ecosystems, mouse-like rodents are a significant source of parasitic pollution. With a high number of rodents and high extensiveness of invasion by nematodes p. Syphacia, there is a significant accumulation of invasive beginning in the external environment, which increases the epidemiological and epizootological risks of this helminthiasis.