Abstract
The authors studied the distribution of an invasive species of rotan fish Perccottus glenii in diverse water bodies located in the Nizhny Novgorod, Kaluga, and Chelyabinsk regions, Republic of Tatarstan of the Russian Federation. All the studied water bodies are under the influence of anthropogenic press of different nature and degree of impact. Of the 8 water bodies, 4 are located in a specially protected area. The authors identified the habitats of Perccottus glenii in all surveyed geographical locations. In these water bodies, the infection of rotan with an associated alien specific cestode, Nippotaenia mogurndae, was studied for the first time. The introduction of a parasite with a rotan was revealed in 7 out of 8 geographical points. The parasitic subsystem of "Nippotaenia mogurndae–Perccottus glenii" is stable, including in water bodies in protected areas and urbanized territories, under significant an-thropogenic stress. For most of the studied water bodies, a "riverine" vector of invasion of the species is currently marked – settlement along the hydrographic network: riverbeds, coastal sections of water bodies, including the development of floodplain water bodies. The cestode Nippotaenia mogurndae was used as a biological marker for analysing vectors and pathways of geographical dispersal of Perccottus glenii. The effectiveness of using Nippotaenia mogurndae in water bodies initially inhabited by "aquarium" individuals was noted to identify the "second wave" of Perccottus glenii expansion with a different vector of invasion.
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