[The seasonal dynamic of fleas (Siphonaptera) abundance on apodemus uralensis in the northen part of Novgorod Region].

Seven fleas species were revealed on Apodemus uralensis. Only three of them (Ctenophthalmus agyrtes, Ct. uncinatus, Megabothris turbidus) are the main parasites of this rodent species and have similar phenology of imago. They appear in April, parasitise during spring and summer periods and disappear in autumn, in September-October. The abundance of all three species shows two peaks in a year, which correspond to two generations. Four species (Amalaraeus penicilliger, Ct. bisoctodentatus, Peromyscopsylla bidentata, P. silvatica) are not peculiar to Apodemus uralensis. They pass on this host species occasionally from other animals inhabiting forest biotopes.