title: [The adaptive reactions of the gill ectoparasites of the bream (Abramis brama) and of the white bream (Blicca bjoerkna) to exposure to an anthropogenic factor in the Ivan'kovo Reservoir].
abstract: Adaptive responses of some gill ectoparasites of the common bream Abramus brama and the white bream Blicca bjoerkna have been studied in five zones of the Ivan'kovo Reservoir: in the region of favorable ecological conditions, in two eutrophic zones and in two areas under the toxic loading. It is found out, that at the response to the pollution the infestation of fishes with most parasite species decreases. The replacement of dominant species is also can be considered as the adaptive response of parasites. It is recorded, that each examined zone with a specific ecological conditions obtains a specific parasite species grouping with a certain composition and abundance of parasite species. The monogeneans of the genus Dactylogyrus express their adaptation to increased temperature by decrease of chitinoid structure size in attachment disc, while the copepods Ergasilus sieboldi react to this factor by faster maturation of egg sacks.
authors.forename: T I
authors.initials: TI
authors.lastname: Zharikova
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D017753:Ecosystem; D004478:Ectoparasitic Infestations / Q000469:parasitology / Q000662:veterinary*; D005068:Eutrophication; D005393:Fish Diseases / Q000469:parasitology*; D005399:Fishes / Q000469:parasitology; D005618:Fresh Water / Q000469:parasitology*; D005880:Gills / Q000469:parasitology*; D010271:Parasites / Q000502:physiology*; D012426:Russia; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical