Structural changes of helminthofauna in rodents caused by introduction and settlement of animals in the Volga Delta

Long-term parasitological monitoring is important for observation of the emergence, establishment, and development of relations in parasite-host systems. The greatest achievement in helminthological investigations carried out in reserves is obtaining and analyzing long-term data that quantitatively and qualitatively characterize the interrelation of members in a biocenosis. The investigation of natural and anthropogenic processes in natural complexes and especially the identification of ecological mechanisms activated by different changes possess both scientific and practical value.