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Year 2021, Volume 55, Issue 5
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Genetic variability of Leucochloridium paradoxum trematodes from the Leningrad region with the use of the mitochondrialcytochrome oxidase subunit I (cox1) gene fragment. P. 355-361.
Genetic variability of Leucochloridium paradoxum Carus, 1835 trematodes from the north-eastern Europe (Russia, Leningrad Region: Vyritsa, Kuzmolovo, Boksitogorsk, Lyuban) based on the mitochondrial cytochrome oxidase subunit I (cox1) gene fragment was analyzed. Ten cox1 haplotypes were revealed. The average genetic distance between samples was 0.00237 ± 0.00117. The average genetic distance between sampling sites was 0.00219 ± 0.00030.
in Russian
Interpopulation differences of fleas (Siphonaptera) in the transmission of plague pathogen. P. 362-386.
The interactions of the plague pathogen with fleas from various natural populations have been considered. A significant effect of the population factor on the proventriculus block formation, on the intensity of the microbial clumps formation in the gastric tract of insects, and on the efficiency of the pathogen transmission to intact animals has been demonstrated on the basis of large-scale experimental work carried out mainly in the Siberian natural foci of plague. The results led us to assume that the ecological plasticity of the plague pathogen was caused not only by its close contacts with specific flea populations in the past. However, this factor significantly affects the characteristics of the interaction between the pathogen and these insects.
in Russian
Host preferences of Nosopsyllus laeviceps (Siphonaptera), the main vector of flea plague on the territory of the southern part of the Caspian sandy natural plague focus. P. 387-397.
The Stavropol part of the Caspian sandy natural plague focus (No. 43) is located in the Eastern Ciscaucasia. The main carriers of the plague pathogen in the focus are small gerbils (midday jird Meriones meridianus Pallas, 1773 and tamarisk jird Meriones tamariscinus Pallas, 1773) and little souslik Spermophilus pygmaeus Pallas, 1779. The main vectors, fleas of the small gerbils Nosopsyllus (Gerbillophilus) laeviceps (Wagner, 1909), have been collected from the fur of 15 host species - 13 species of rodents and two species of insectivores. Preference of this species to the tamarisk jird and, to a lesser extent, to the midday jird has been established. The largest number of adult fleas in the fur of the jird hosts was recorded in spring. In autumn, the abundance of fleas was 1.5-2.5 times lesser than in spring. The Sorensen-Chekanovsky similarity coefficient showed a low degree of similarity between the abundances of N. laeviceps on the two species of jirds. The Mann-Wilcoxon-Whitney test demonstrated significant differences between the median abundances of N. laeviceps on tamarisk and midday jirds. A few N. laeviceps was collected in the fur of additional feeders.
in Russian
Fleas (Siphonaptera) of rodents in the Eastern Caucasian highland natural plague focus. P. 398-407.
The Eastern Caucasian high-mountain natural plague focus is located on the northern slope of the Main Caucasian ridge. This peculiar region has a rich fauna of rodent fleas, represented by 32 species of 17 genera. Most flea species parasitize here on a wide range of hosts, including representatives of different subfamilies, but belonging to the same ecological group of rodents. Fleas of 26 species are distributed throughout whole northern slope of the Eastern Caucasus. Three species inhabit the Samur and Sulak river basins and were not found to the west, despite the presence of suitable hosts. Three more species occur in the westernmost part of the East Caucasus. The warm period of the year is the most favorable time for the transmission of plague due to the high activity of feeding and reproduction of most of the fleas of the common vole.
in Russian
Tick-borne diseases: the epizootological survey of Tunkinsky district, Republic of Buryatia. P. 408-422.
Ixodid ticks, collected during three seasons (2017-2019) in different plots of the Tunkinsky district of Buryat Republic, were tested for the tick-borne diseases agents range. The genetic markers of tick-borne encephalitis virus (TBEV), Ehrlichia spp., Anaplasma spp., Borrelia spp. and Rickettsia spp. have been detected (in increasing order of magnitude). Two or more agents' markers in different combinations have been detected in 15.2-73.8% specimens depending on the set of pathogens tested. The existence of combined tick-borne infections natural foci has been shown. Differences have been detected in spatial, temporal, species, age and sex prevalence of the agents in ticks. The subtype of TBEV isolates and Borrelia species circulating have been identified.
in Russian
Gamasid mites (Acari: Parasitiformes: Gamasina) of rodents of the valley-foothill zone of Issyk-Kul basin (northern Tian-Shan). P. 423-434.
The article presents the current species composition of gamasid mites (Gamasina) of rodents in the valley-foothill zone of Issyk-Kul basin, including 28 species belonging to 10 genera and 4 families - Parasitidae (2 species), Macrochelidae (1 species), Laelapidae (14 species), and Haemogamasidae (11 species). Nine species of mites have been recorded in the Issyk-Kul basin for the first time. The indices of abundance of mites on hosts have been calculated.
in Russian
Combes Claude (22 июля 1935 г. - 8 июля 2021 г.). Obituary. P. 435-440.
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in Russian