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Year 2015, Volume 49, Issue 3
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Fauna and structure of parasite communities of the common minnow Phoxinus phoxinus in the rivers of southern Yakutia. P. 145-159.
In Southern Yakutia, the common minnow hosts 37 species of parasites, including the most numerous groups, such as Infusoria, Myxozoa, and Monogenea. Specific parasites include Myxobolus lomi, Myxobolus mongolicus, Epistylus phoxini, Apiosoma phoxini, Trichodina mira, Paratrichodina phoxini, Gyrodactylus laevis, Gyrodactylus limneus, Gyrodactylus macronychus, Gyrodactylus magnificus, and Diplostomum phoxini. The component parasite communities are characterized by high rates of evenness and diversity, but the low level of dominance. They possess different structure in dependence to specific conditions of their formation. Pollution of the Chulman River with heavy metals and organic wastewater resulted in changes of the structure of parasite communities and replacement of dominants. The characters of chronic damages of gills in the minnow caused by M. lomi have been reported, including deformations of gill arches and filaments, destructions of lamellae, and substitution of the lamellae by parasite's plasmodia.
in Russian
Morphological variability of Proteocephalus percae (Müller 1780) parasitizing coregonid fishes. P. 160-170.
Morphological variability of Proteocephalus percae from native host — perch Perca fluviatilis and two species of coregonids (whitefish Coregonus lavaretus and Arctic cisco C. autumnalis) from fish farms of Karelia were studied. Parasite groups from 3 host species differed by morphometric parameters. Morphological structure of P. percae from native host included three morphs, those numbers were almost equal. Parasite groups of whitefish and Arctic cisco differed from that of perch in morphological structure and dominance of different morphs. Changes of the P. percae morphological structure was related to differences in ecological niches of three hosts of parasite. This reflects the initial stages of microevolution. The results obtained allow us to estimate an adaptive response of parasitic worms to new host species settling to pond.
in Russian
The first record of Dimerosaccus oncorhynchi (Trematoda: Opecoelidae) in fishes from rivers of Primorsky Territory, Russia, with a discussion on its taxonomic position using morphological and molecular data. P. 171-189.
The opecoelid trematode Dimerosaccus oncorhynchi (Eguchi, 1931) Shimazu, 1980, hitherto known only from the Japanese archipelago, has been found in three species of freshwater salmonid fish (Oncorhynchus masou, Brachymystax tumensis, Salvelinus curilus) from rivers of Primorsky Territory, the Sea of Japan basin, Russia. This is the first record of the parasite in the continental part of Asia. Fishes B. tumensis and S. curilus are new hosts for D. oncorhynchi. The ecological notes, morphological description and drawings of the found trematodes clarifying the morphology of the male reproductive system are given. In the present study phylogenetic relationships of the species D. oncorhynchi with the related taxa were revealed using partial sequences of the 28S rDNA. Obtained results indicate the validity of D. oncorhynchi as the member of the subfamily Opecoelinae, which was closely related to the genus Opecoeloides, a representative of this subfamily.
in Russian
The emission of plagiorchis multiglandularis cercariae from naturally infected snails Lymnaea stagnalis in Chany Lake, south of West Siberia. P. 190-199.
The daily cercarial output of freshwater trematode Plagiorchis multiglandularis from naturally infected snail Lymnaea stagnalis were studied. The snails were collected in the Chany Lake (South of West Siberia). The daily cercarial output from the snail of different size was determined. The average daily cercarial output ranged from 4641 + 1829 at the snail with shell length 29 mm to 14022 ± 5198 at the snail with shell length 44 mm. The positive correlation between the average daily cercarial output and the shell of snail host was found (p < 0.001). The maximum of P. multiglandularis cercariae release from the snail during daytime, that coincided with period of activity of the second intermediate hosts. Temperature-mediated increase in cercarial output of P. multiglandularis in temperature range 23—24.5° C was found. The cercarial output was inhibited over the temperature optimum.
in Russian
Seasonal changes in the biology of Leucochloridium paradoxum (Trematoda, Leucochloridiomorphidae). P. 200-207.
Infection of molluscs Succinea putris by trematodes Leucochloridium paradoxum was studied in the region of Vyritsa (Leningrad Province) during the period of 2008—2014. On the basis of the obtained data, seasonal dynamics of infection of molluscs can be presented as follows. Infection of S. putris occurs during the whole warm period from May to August. Young sporocysts of L. paradoxum overwinter and the metacercariae that develop in their extensions mature during spring becoming infective for birds. In the second half of summer, sporocysts start degenerating and die in late August-September. Each sporocyst can form 2—3 mature broodsacs (maximum 5) simultaneously. In cases of multiple infections, their number can reach 19. Several cases of independent release of sporocysts from molluscs were observed. They survive in environment for about an hour, retaining the ability to infect definitive hosts. Additionally, birds can be infected by pecking of horns of infected snails.
in Russian
The mosquitoes (Diptera, Culicidae) of the Kirov region. P. 208-224.
It analyzed the data of mosquitoes caching on the Kirov region area. The habitat distribution and species diversity are analyzes. The checklist includes 25 species.
in Russian
Obituary. T.K. Mikailov (15.01.1931-17.12.2014). P. 225-227.
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in Russian
Obituary. N.M. Pronin (1941-2015). P. 228-230.
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in Russian