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[systematization and nomenclature of microtus oeconomus pall.; mammalia muridae]. 195124541426
studies on the helminth fauna of alaska. xv. some notes on the cysticercus of taenia polyacantha leuckart, 1856, from a vole (microtus oeconomus operarius nelson). 195313053323
[the action of small doses of radiation and incorporated naturally radioactive elements on spermatogenesis of microtus oeconomus in natural conditions]. 19655889202
notes on pasteurella tularensis isolated from a vole, microtus oeconomus pallas, in alaska. 19695765177
[faunal notes on anoplura in microtus oeconomus (pallas)]. 19705529987
[the genetics of 6-pgd (ec; 1.1.1.44) in various mammals. i. studies on 6 species of microtinae, rodentia, isoenzyme polymorphism and family studies in microtus oeconomus and microtus ochrogaster]. 19705507049
in vitro chromosome studies in the root vole (microtus oeconomus). 19705535795
chromosome polymorphism in the root vole (microtus oeconomus). 19705525814
hepatozoon sp. in northern voles, microtus oeconomus, on st. lawrence island, alaska. 19715167766
leptospira interrogans in the ballum serogroup from a vole, microtus oeconomus (pallas) in alaska. 19744436918
physiological responses to hypoxia in the tundra vole. 19744415072
[blood parasites of small wild mammals in czechoslovakia].the author investigated 4,853 specimens of wild living small mammals (43 species: insectivora, chiroptera, lagomorpha, rodentia, carnivora) from czechoslovakia for blood parasites. trypanosomes were found in talpa europaea, sorex alpinus, crocidura suaveolens, myotis myotis, apodemus sylvaticus, apodemus flavicollis, mus musculus, rattus norvegicus, clethrionomys glareolus and microtus agrestis. babesia was detected in myotis emarginatus, myotis myotis, clethrionomys glareolus, microtus arvalis ...19751158292
the tundra vole (microtus oeconomus) as a laboratory animal. 1976333180
comparative solubilities and electrophoresis of microtine hemoglobins.1. the electrophoretic mobilities of the hemoglobins of 7 taxa of microtines were compared. microtus oeconomus, m. pennsylvanicus pullatus and m. xanthognatus showed identical 2-band patterns on electrophoresis of their hemoglobins while m. pennsylvanicus tananaensis showed only a single hemoglobin corresponding to the major band of the others. dicrostonyx rubricatus and d. stevensoni exhibited identical patterns different from the microtus species. lemmus sibiricus had a slow hemoglobin compone ...1977400948
microtus oeconomus (rodentia), a useful mammal for studying the induction of sex-chromosome nondisjunction and diploid gametes in male germ cells.preliminary data indicate that chemicals can also increase the frequency of sex-chromosome nondisjunction. positive results--which certainly need further confirmation--have been obtained for mms, p-fluorophenylalanine, vincristine, procarbazine, carbendazim, and bleomycin. nocodazole, benomyl, colcemic, 6-mercaptopurine, and halothane were all negative at the concentrations tested. for the induction of diploid spermatids positive results were only obtained for mms and parafluorophenylalanine. in ...1979387396
sensitivity of european microtines to injected cdcl2.basic histologic and metabolic indices of damage to the testes by cdcl2 were observed in six species of rodents: lagurus lagurus, pitymys subterraneus, microtus oeconomus, m. agrestis, clethrionomys glareolus (and mus musculus for comparison). all species showed discoloration of the subcapsular tissues and damage to the testicular parenchyma. testes of all species receiving cdcl2 utilized from 43% to 76% less oxygen than did those from untreated individuals. cadmium treatment preceded few signif ...1979232358
[leptospira distribution in the soil of a natural focus of the infection (an attempt at the radioisotopic labelling of infected voles)].the mass radioisotope (32p) labelling of all tundra voles excreting zeptospira, infected urine was carried out over the area of 1 ha, and the results of the experiment analyzed by the method of planar coherent graphs, showed the irregular (spotted) distribution of "infected spots", i. e. soil patches contaminated by zeptospira. the borders of individual small foci of infection did not coincide with the outlines of soil and vegetational divisions of the area. the spatial structure of the "extraor ...1979380242
the induction of sex-chromosomal nondisjunction and diploid spermatids following x-irradiation of pre-spermatid stages in the northern vole microtus oeconomus.chromosome nondisjunction seems to be one of the most important mutagenic effects occurring in man and makes an enormous contribution to human foetal wastage. as yet, little or no information is available on which environmental factors are important in inducing nondisjunction and accordingly we have investigated the effect of x-irradiation on inducing nondisjunction in male germ cells of an experimental mammal, the northern vole-microtus oeconomus. using a staining technique based upon the prese ...1979381906
atherosclerosis in lemmings and voles fed a high fat, high cholesterol diet.two species of lemmings and two species of voles were fed a high fat, high cholesterol diet for several months. clethrionomys rutilus had a moderate (2x) rise in serum cholesterol while microtus oeconomus had a marked increase (5x); dicrostonyx stevensoni and dicrostonyx rubricatus had extreme increases (8x and 11x, respectively). typical lesions of atherosclerosis were observed in all species, but d. rubricatus had significantly more severe lesions. hepatic fatty infiltration was the principal ...1979383113
[analysis of the antigeno-immunologic activity of heated leptospirosis vaccine in vaccinees and in an experimental study].the comparative analysis of the immunological effectiveness of heat-killed polyvalent leptospirosis vaccine has shown the low immunological effectiveness of the whole preparation (17.8%) and its components with the exception of the antigen of the grippotyphosa serogroup. antibodies could be detected in the vaccinees for not more than 10 months, and they showed the properties of 19s-macroglobulin antibodies. in experiments on rabbits newly isolated leptospira strains from human patients and wild ...19806998213
further studies on effects of x-irradiation on prespermatid stages of the northern vole microtus oeconomus: low induction of sex-chromosomal nondisjunction and very high induction of diploid spermatids.microtus males have been irradiated with x-ray doses of 25, 50, 100 and 200 rad and early spermatids were then analyzed for evidence of induction of sex-chromosomal nondisjunction and diploid spermatids at 1, 4, 6, 7, 9 and 12 days after treatment. in contrast to earlier findings, there was no induction of nondisjunction above control levels. a possible explanation for the differences in results of old and new experiments might be that genetic changes have taken place in the microtus colony that ...19817022180
[strain properties of the aina/1448 serotype of the tick-borne encephalitis virus].four strains of tick-borne encephalitis (tbe) virus isolated in the irkutsk region were shown by the agar gel diffusion and precipitation test with adsorbed sera to comprise a single antigenic group differing from members of the eastern and western tbe virus serotypes (sophyin and 256 strains). the group includes the strains isolated during 20 years (1960 - 1980) from patients with chronic tbe form (aina/1448 and 763 strains), from the brain of root vole (microtus oeconomus pall) (strain 147), a ...19817336697
some corrections in haemogregarine (apicomplexa: protozoa) nomenclature.the nomenclature of three genera in the family haemogregarinidae (haemogregarina, karyolysus, and hepatozoon) has been reviewed and the following new names are introduced to replace homonyms or for previously unnamed species: haemogregarina carlosi n. nom., in the erythrocytes of the lizard lacerta ocellata; haemogregarina tincae n. nom., in the stomach and intestine of the tench tinca tinca; hepatozoon insectivorae n. sp., in the leucocytes of the shrews sorex araneus and crocidura leucodon; he ...19826757414
[occurrence of natural tularemia foci in kamchatka].the focus of tularemia in the ust-kamchatsky region belongs probably to the flood-plain and swamp type with muskrats and tundra voles being the main carriers. in autumn 1980 for the first time three cultures were isolated in this region: 1 from a tundra vole and 2 from muskrats. the presence of antibodies to tularemia antigen in norway rats was revealed in the passive hemagglutination test.19836353814
[population ecology of leptospires. 1. an experience with evaluation of leptospira count in a carrier and the intensity of elimination in the urine].the number of l. hebdomadis and l. grippotyphosa in the body of tundra voles (microtus oeconomicus) has been shown to be approximately 500-800 million; about 100 million of them are daily eliminated from the body of a vole with urine. about 70% of the total volume and separate portions of urine contain leptospires, a single portion of urine containing about 2 million microbial cells. these data have proved to be the same for both l. hebdomadis and l. grippotyphosa.19836613420
habitat use by singing voles and tundra voles in the southern yukon.we investigated how far competitive interactions influence the use of habitats and relative abundance of two species of microtus in the southwestern yukon. we worked in the ecotone between alpine tundra and subalpine shrub tundra where populations of singing voles (microtus miurus) and tundra voles (m. oeconomus) overlap little.we removed tundra voles from shrub tundra on one live-trapping area to look at the effect on the contiguous population of singing voles in alpine tundra. the removal of t ...198528310875
[cytogenetic effect of the action of apretana on the bone marrow cells of microtus oeconomus].a frequency of aneuploid cells and mitotic activity induced in bone marrow cells of microtus oeconomus by apretan was examined. treatment with doses 10 g per kg of the weight increased the frequency of aneuploidy from 5.4 to 29.6% and that of the mitotic activity two times. the possible reasons for these data are discussed.19853899860
centric fission in microtus oeconomus. a new locality in south east norway. 19863546213
centric fission in microtus oeconomus. a new locality in south east norway. 19863539888
steroid sulphatase levels are higher in males than in females of the root vole (microtus oeconomus). yet another rodent with an active y-linked allele?steroid sulfatase (sts; ec 3.1.6.2) levels were assayed in cultured fibroblasts of root voles captured in the wild. four independent experiments were performed using two different substrates (dheas and e1s). evidence is presented that in this species, sts levels are significantly higher in males than in females (ratio 1.6:1). we discuss our findings on a comparative basis and suggest that in the root vole the sts gene(s) is x- and y-linked (as in the mouse) and that it is subject to x-inactivati ...19873305308
basic carriers of trichophyton mentagrophytes var. gypseum in the sverdlovsk region.tests for myococarriers were made on 4.297 wild small mammals. clinical examinations only were carried out on 1,204 animals, both clinical and laboratory examinations on 3,093 animals. the suppurative form of trichophytosis was diagnosed in only one specimen of microtus oeconomus out of 1,204 animals examined. t. ectothrix microides was found in the hair taken from the focus. t. mentagrophytes var. gypseum was obtained by culture on nutrient media. no clinical signs of mycosis were found in 3,09 ...19873680938
[isolation of poxvirus (poxviridae, orthopoxvirus, the cowpox complex) from the root vole microtus (m.) oeconomus pal. 1776 in the forest tundra of the kola peninsula]. 19882967016
[the functioning of a drained natural focus of leptospirosis in a nonchernozem area].the drainage of a natural focus of leptospirosis of the flood plain-swamp type, carried out over the period of 15 years, has led to changes in the species structure of small mammals and to an increase in the number of leptospira-carrying species. nevertheless, like before drainage, the prevalent species and the main carrier of leptospires is still the root vole (microtus oeconomus pallas). the intensity of the epizootic process among small mammals at the final stage of drainage has proved to be ...19882974674
postoncospheral development and cycle of taenia polyacantha leuckart, 1856 (cestoda: taeniidae). first part.the postoncospheral development and cycle of taenia polyacantha leuckart, 1856, an holarctic species of cestode, were investigated in the laboratory as well as in the tundra of northern alaska. foxes, alopex lapogus (l.) and vulpes vulpes (l.), serve as final host of t. polyacantha; the northern vole, microtus oeconomus (pallas), and the brown lemming, lemmus sibiricus (kerr), are important as the intermediate host. as determined in experimentally infected voles and lemmings, the oncosphere of t ...19883059953
the response of spermatogonia and spermatocytes of the northern vole microtus oeconomus to the induction of sex-chromosome nondisjunction, diploidy and chromosome breakage by x-rays and fast fission neutrons.microtus males were exposed to different doses of 250 kv x-rays or fast fission neutrons of 1 mev mean energy. early (= round) spermatids were analyzed for the presence of extra sex chromosomes, diploidy and micronuclei at different time intervals corresponding with treated differentiating spermatogonia and spermatocytes. induction of nondisjunction of sex chromosomes could not be detected. in contrast, induction of diploids by both types of radiation was statistically significant at all samplin ...19892642602
[the isolation of tick-borne encephalitis virus strains and the determination of the scope of immune stratification among the population and the domestic animals on the northern russian plain].between 1986 and 1987 the authors conducted virological survey of 689 ixodes persulcatus and 420 mouse-like and insectivorous rodents at the territory of arkhangelsk province and the republic of komi. a total of 8 strains of tick-borne encephalitis virus were isolated. out of them 3 strains were isolated from small mammalians (2 from clethrionomys glareolus, 1 from microtus oeconomus) at the southeastern areas of arkhangelsk province within the middle taiga subarea, 5 strains were isolated from ...19902145500
a programme to reduce the risk of infection by echinococcus multilocularis: the use of praziquantel to control the cestode in a village in the hyperendemic region of alaska.this paper reports the results of a 10-year field trial designed to reduce the risk of infection by echinococcus multilocularis to residents of a village in a hyperendemic area (savoonga, st. lawrence island). the objective was to prevent dispersal of infective eggs of the cestode within the village by means of monthly treatments of dogs with praziquantel. northern voles, microtus oeconomus, present in the village as commensals, served as an index of risk, as the incidence of infection in the vo ...19902222026
[the reproductive potential of the bank vole (clethrionomys glareolus schreb) and of the tundra vole (microtus oeconomus pall.) under the conditions of the elevated radiation background of bryansk province].the continuous irradiation (connected with the accident on the chernobyl atomic power plant) by cesium-137 of the dominant species of rodents (clethrionomys glareolus, microtus oeconomus) in the forests of bryansk province had a deteriorating effect on the state of reproductive organs and on the course of embryogenesis, stimulated the reproduction cycle but inhibited the rate of sexual maturation and increased the death-rate of young animals. these effects resulted in significant ageing of the p ...19921302492
occurrence of a syngamus sp. in tundra voles (microtus oeconomus) collected on st. lawrence island, bering sea.a species of syngamid nematode belonging to the genus syngamus was found in the respiratory tract (terminal trachea to bronchi) of tundra voles (microtus oeconomus) collected on st. lawrence island, alaska (usa). its prevalence in june 1989 was greater than 29% (12 of 41 male voles and seven of 24 females) in the village of savoonga, while no nematodes were found from 41 voles collected in the village of gambell. lesions included dilatation of parasitized respiratory ducts and peribronchial and ...19921548793
identification of x and y spermatozoa in the northern vole, microtus oeconomus. 199345952
[identification of structural rearrangements in the karyotype of microtus oeconomus from chernobyl by differential staining of chromosomes].karyological studies of rodents within a 30-km radius of the chernobyl' nuclear power plant revealed one female root vole (microtus oeconomus) with an abnormal karyotype. the use of c, g, and agnor banding methods allowed us to determine that morphological changes in two nonhomologous autosomes, which were accompanied by rearrangements in distribution of g bands, heterochromatin, and nor, are the result of a reciprocal translocation. chromosomal aberrations were probably inherited or appeared in ...19947514556
prevalence of cryptosporidium sp. in peak density microtus agrestis, microtus oeconomus and clethrionomys glareolus populations.the prevalence of cryptosporidia was determined in high density populations of microtus agrestis, microtus oeconomus, and clethrionomys glareolus in finland. one of 131 m. agrestis and one of 41 c. glareolus each were found to be infected with cryptosporidium sp.; none were found in 43 microtus oeconomus. these apparently healthy voles had neither signs of clinical disease nor histopathological changes in intestines.19948151812
the curious normality of the synaptic association between the sex chromosomes of two arvicoline rodents: microtus oeconomus and clethrionomys glareolus.in all eight species of arvicoline (microtine) rodents previously described, the x and y chromosomes have remained asynaptic throughout pachynema. since synapsis is presumed to be a prerequisite for crossing over, it has been concluded that the sex chromosomes in these species are also achiasmatic, but the mechanism(s) of their disjunction remains an enigma. their asynaptic, achiasmatic condition has been attributed to loss of the pseudoautosomal region (borodin et al. 1991; carnero et al. 1991; ...19948083057
diel pattern of locomotor activity in populations of root voles, microtus oeconomus.surface locomotor activity of root voles (microtus oeconomus) during summer and autumn was recorded with passage-counters in four experimental populations in 0.5 ha outdoor enclosures. populations differed considerably with respect to density, geographical origin and social behavior of animals, and year of observation. the general characteristics of diel activity patterns, however, were very similar among populations. root voles were generally more active during daytime than during the night, an ...19957488759
small mammals as reservoir hosts for borrelia in russia.in 1992-1993, a total of 29 isolates of borrelia were obtained from small mammals captured in taiga forests of the perm' region: 26 isolates were obtained from clethrionomus glareolus and one each from c. rufocanus, microtus oeconomus, and apodemus sylvaticus. isolation of borrelia was performed by plating the animal material on bsk-ii medium. most isolates (86.2%) were obtained from the urinary bladder, the rest from the heart and spleen. according to the results of ifa with a set of monoclonal ...19957549164
phylogenetic relationships within taenia taeniaeformis variants and other taeniid cestodes inferred from the nucleotide sequence of the cytochrome c oxidase subunit i gene.nucleotide sequence variations in a region of the mitochondrial cytochrome c oxidase subunit i (coi) gene (391 bp) were examined within seven species of the genus taenia and two species of the genus echinococcus, including ten isolates of t. taeniaeformis and six isolates of e. multilocularis. more than a 12% rate of nucleotide differences between taeniid species was found, allowing the species to be distinguished. in e. multilocularis, no sequence variation was observed among isolates, regardle ...19957567901
population dynamics of the collared lemming and the tundra vole at pearce point, northwest territories, canada.from 1987 to 1989 we monitored population changes during summer of the collared lemming (dicrostonyx groenlandicus) and the tundra vole (microtus oeconomus) at pearce point, northwest territories, canada (69° 48' n, 122° 40' w). populations on four study areas did not cycle but remained at low density (<3/ha) each year and continued at low numbers for the following 3 years (reid et al. 1995). lemming numbers often declined throghout the summer in spite of continous reproduction, and population r ...199528306997
effect of birch (betula pendula) bark and food protein level on root voles (microtus oeconomus): ii. detoxification capacity.the effect of protein and birch bark powder (bbp) content of forage on detoxification capacity of root voles (microtus oeconomus) was studied. young voles were fed with eight different diets for two weeks. individuals on low (3%) protein diets had significantly lighter livers and kidneys than those on moderate (6%) or high (12%) protein diets. birch bark powder addition did not have significant effect on organ weight. detoxification was significantly induced, apparently due to secondary compound ...199624227580
effect of birch (betula pendula) bark and food protein level on root voles (microtus oeconomus): i. food consumption, growth, and mortality.the effect of protein and birch bark powder (bbp) content of forage on food consumption and growth of root voles (microtus oeconomus) was studied by feeding young voles with eight different diets for two weeks. voles ate more when the protein content of forage was moderate (6%) or low (3%), and when bbp was added to the diets, as compared to a high (12%) protein diet without bbp addition. on high and moderate protein diets voles gained weight, whereas on low protein diets they lost weight. addit ...199624227579
[the epidemiological and epizootiological characteristics of leptospirosis in the republic of sakha (yakutia)].among zoonotic infections with natural foci in the republic of sakha (yakutia), leptospiroses have assumed greater importance. their morbidity is sporadic, mainly afflicting rural adults. the serogroups pomona, grippotyphosa, and icterohaemorrhagiae are prevalent in the etiological structure of leptospiras. an epizootiological survey has revealed natural and anthropurgic leptospirosis foci which present a hazard primarily to rural inhabitants who deal with animal husbandry, fur-bearer breeding, ...19968700015
[the isolation of borrelia from the tick ixodes trianguliceps (ixodidae) and the possible significance of this species in the epizootiology of ixodid tick-borne borrelioses].ixodes trianguliceps is a common tick species of the eurasian forest zone. these ticks live probably in natural foci of ixodid tick-borne borrelioses (itbb) from western europe to transbaikalia, but their role in circulation of corresponding pathogens remains unclear. this study was performed in a natural itbb focus located in the perm region of russia (near the urals), where borrelia garinii and b. afzelii circulate and i. persulcatus serves as their main vector. in july-august of 1994, 296 sma ...19968975209
[biochemical changes in the brain of the root vole (microtus oeconomus) from a 30-kilometer zone around the chernobyl atomic electric power station].deviations in lipid peroxidation parameters and in activity of dehydration enzymes in the brain of the tundra voles inhabiting areas with higher level of technogenic contamination (the 30-km zone of the chernobyl npp and the republic of komi) have been analyzed. during the first years after the disaster a decrease in the lipid antioxidative status of the brain and dehydrogenase activity, changes in the lipid composition of voles trapped in the disaster zone in comparison with control ones were m ...19969005669
[spontaneous mixed infection in rodents with borrelia and leptospira].this study was performed in a natural itbb focus located in perm' region of russia. in 1993-1995, 73 root voles (microtus oeconomus), collected in the forests, were examined by means of inoculation of internal organs on bsk-ii medium. borrelia were found in 13 animals (17.8%). according to the results in rlfp analysis 11 isolates were classified as b. garinii, 1 as b. afzelii and 1 as mixture of b. garinii and b. afzelii. in one case leptospira, which was identified by pfge analysis as grippotyp ...19969026677
[influence of radioactive pollution on the character of the distribution of wild mouselike rodents according to the measure of lipid antioxidant activity in their organs].the estimation of the degree of the radioactive contamination effect on the antioxidative status in tissues of rodents from natural populations is done by means of biometric methods. it is shown, that the character of distribution and variability of the lipids antioxidant activity (aoa) differs significantly depending of species and age of animals, the degree of contamination on areas where wild rodents were caught and time during which the radioactive factor affected. the change in character of ...19989889789
the effects of experimental habitat destruction and patch isolation on space use and fitness parameters in female root vole microtus oeconomus.the aim of this study was to test whether experimentally induced destruction and fragmentation of habitat and varying degrees of patch isolation applied to 11 experimental populations of root voles affected space use and fitness parameters in radio-tracked females. it was predicted that the habitat destruction would disrupt the spatiosocial relations between breeding individuals, which, in turn, would cause lowered survival and reproductive success. different degrees of patch isolation were expe ...199826412373
causes and consequences of natal dispersal in root voles, microtus oeconomus.to test the causes and consequences of variation in natal dispersal in root voles we released 53 matrilines (mothers with newly weaned litters) separately in field enclosures, during nine consecutive periods. the matrilines could disperse and distribute themselves among three pre-emptied habitat patches. two dispersal measures were recorded: short-distance dispersal defined as individuals immigrating to a neighbouring patch, and long-distance dispersal defined as unsettled individuals captured a ...19989933531
effects of temperature and photoperiod on thermogenesis in plateau pikas (ochotona curzoniae) and root voles (microtus oeconomus).we examined the effects of temperature and photoperiod on metabolic thermogenesis and the thermogenic characteristics of brown adipose tissue in plateau pikas (ochotona curzoniae) and root voles (microtus oeconomus), the dominant species of small mammals in the alpine meadow ecosystems on the qinghai-tibetan plateau. pikas and voles were acclimated in the following groups: (1) long day-warm temperature (16l:8d, 23 degrees c) (2) long day-cold temperature (16l:8d, 5 degrees c), (3) short day-warm ...199910093908
foraging behaviour of the root vole microtus oeconomus in fragmented habitats.the effect of habitat fragmentation on spatial foraging behaviour in the root vole microtus oeconomus was investigated in seven experimental populations. four of the populations were established in large, continuous blocks (30 × 95 m) of meadow habitat (treatment plots), whereas the three remaining populations had six small rectangular habitat fragments (30 × 7.5 m) with variable inter-fragment distances (control plots). both the small habitat fragments and the large continuous habitat were embe ...199928308563
microsatellite analysis of population structure and genetic differentiation within and between populations of the root vole, microtus oeconomus in the netherlands.eight microsatellite markers for the root vole (microtus oeconomus) were developed to assess the amount of genetic variation for nine dutch root vole populations from four different regions, and to evaluate the degree of differentiation and isolation. all eight microsatellite loci were found to be highly variable with observed heterozygosity values ranging from 0.61 to 0.82. these values are similar to those observed for more distant populations from norway, finland and germany. therefore, the p ...200011050559
hippocampal mossy fibers and swimming navigation learning in two vole species occupying different habitats.we showed previously for mice that size differences of the infrapyramidal hippocampal mossy fiber projection (iip-mf) correlate with spatial learning abilities. in order to clarify the role of the iip-mf in a natural environment, we studied the bank vole (clethrionomys glareolus), adapted to a wide range of different habitats, and the root vole (microtus oeconomus), living in homogenous grassland habitats with small home ranges. morphometry on timm-stained horizontal brain sections of six c. gla ...200010706213
population dynamic and genetic consequences of spatial density-dependent dispersal in patchy populations.predictions about sex-specific, spatial density-dependent dispersal and their demographic and genetic consequences were tested in experimental populations of root voles (microtus oeconomus). each population consisted of two demes inhabiting equal-sized habitat patches imbedded in a barren matrix area. we used a neutral two-allele allozyme marker to monitor gene flow. initially, the two demes were genetically distinct and had different densities so that the size of a high-density deme (genotype b ...200010686164
[the phospholipid composition of the liver in root voles living under different radioecological conditions].the effect of the increased natural radiation background (within some areas in komi republic) and man-caused radioactive contamination in the chernobyl npp accident zone on the composition of liver phospholipids in microtus oeconomus inhabiting these areas was studied. the significant changes in the liver lipid composition in rodents inhabiting both the chernobyl accident zone and the areas with the increased natural radiation background were found. the maximal changes in the liver phospholipid ...200010907414
[species specificity of karyotype instability under conditions of radionuclide contamination (the chernobyl nuclear power plant) in the voles, micrototus oeconomus, micrototus arvalis, and clethrionomys glareolus].the comparative analysis of frequencies of different type cytogenetic anomalies in voles microtus oeconomus, microtus arvalis, clethrionomys glareolus trapped in territories with different levels of radionuclide contamination inside the 30-km zone of estrangement around the chernobyl npp was carried out. animals with constitutive chromosome abnormalities were not revealed. the frequency of lympocytes with micronuclei was the most universal and sensitive character to chronic low-dose radiation in ...200111589050
melatonin and the wintering strategy of the tundra vole, microtus oeconomus.short photoperiod induces physiological changes connected to the wintering of the tundra vole, microtus oeconomus. the aim of the present study was to investigate the effects of continuous melatonin treatment on selected hormones and enzyme activities associated with energy metabolism in the species. liver, kidney, and muscle glycogen concentrations and glycogen phosphorylase activities, as well as liver and kidney glucose-6-phosphatase and lipase esterase activities were determined. plasma lept ...200212130797
holarctic phylogeography of the root vole (microtus oeconomus): implications for late quaternary biogeography of high latitudes.a species-wide phylogeographical study of the root vole (microtus oeconomus) was performed using the whole 1140 base pair mitochondrial (mt) cytochrome b gene. we examined 83 specimens from 52 localities resulting in 65 unique haplotypes. our results demonstrate that the root vole is divided into four main mtdna phylogenetic lineages that seem to have largely allopatric distributions. net divergence estimates (2.0-3.5%) between phylogroups, as well as relatively high nucleotide diversity estimat ...200312753215
molecular typing by pulsed-field gel electrophoresis of bacillus thuringiensis from root voles.the root voles intestinal strains of bacillus thuringiensis, were characterised by pulsed-field gel electrophoresis (pfge). for 14 isolates, three pulsotypes were found, with the use of smai or noti as restriction enzymes. strains in each pulsotypes presented identical dna patterns, indicating that the population structure of b. thuringiensis from root voles is clonal. the similarities in banding patterns were estimated at 56% and 33% for smai and noti digests, respectively. the strains under st ...200312732973
[genogeographic variability and genetic differentiation of the root vole (microtus oeconomus pallas, 1776, cricetidae, rodentia) from the kuril islands].electrophoretic analysis of 12 enzyme systems and 3 nonenzyme proteins (in all, 24 interpretable loci) was carried out for microtus oeconomus from ten kuril islands, kamchatka peninsula, and the vicinity of the city of magadan. gene geographic variation was examined and the coefficients of genetic variation and differentiation were estimated. the inter-population allozyme differentiation was low (dnei, 1972 not higher than 0.053) and caused by variation in the allele frequencies of polymorphic l ...200314658341
[estimation of long-time effects of chernobyl aes accident on behavior markers in a small rodent population].differences in behaviour reactions in "open field" and glycemia under conditions of immobilisation stress of vole (microtus oeconomus, pallas) from two groups ("yanov" and "lelev") were investigated. rodents were ensnared from two populations reproduced for a long time (11 years) in the areas of chnpp exclusion zone with different level of radioactive contamination. the radiation absorbed dose for animals of "yanov" group (external and internal irradiation) was 11-20 times higher than that of "l ...200314963936
[amino acid composition of blood proteins of field voles (microtus oeconomus pall.), living in different radioecological conditions]. 20034780543
[blood plasma proteins of microtus oeconomus voles living under conditions of increased natural background radiation]. 20035031437
zoonotic reservoir of babesia microti in poland.babesiosis is as one of the emerging human and animal diseases transmitted by ticks. it is caused intraerythrocytic parasites of the genus babesia. current evidence of human babesiosis suggests that the majority of cases are involved by babesia divergens and babesia microti piroplasms. as zoonotic reservoir of b. microti serve small mammals--insectivores and rodents. the occurrence of this parasite in natural environment in poland is documented for various regions, in the wide range of mammal ho ...200415787199
effects of peripheral ghrelin on the carbohydrate and lipid metabolism of the tundra vole (microtus oeconomus).ghrelin is a novel orexigenic peptide hormone. in humans and rodents, it increases food intake and its levels are reduced in obesity but increased in fasting. it is an antagonistic signal to leptin informing the central nervous system about negative energy balance. the tundra vole (microtus oeconomus) is an interesting model to study the effects of ghrelin, as it is poorly adapted to fasting. in this study, 10 male voles were injected with intraperitoneal ghrelin at 10 microg kg(-1)day(-1) for f ...200415302267
reproduction of the tundra vole (microtus oeconomus) with dietary phytosterol supplement.phytosterols (ps) are plant-derived compounds with estrogenic activity in vitro and beneficial effects on the serum lipid profile in vivo. in nature, ps exposure can derive from pulp mill effluents. the effects of a pulp-mill derived ps mixture on the reproduction, endocrine variables and enzyme activities of the tundra vole (microtus oeconomus) were investigated in a two-generation study. the cumulative food intake of ps-treated females was higher than in the control group supporting previous r ...200415110103
genetic consequences of pleistocene glaciations for the tundra vole (microtus oeconomus) in beringia.repeated glacial events during the pleistocene fragmented and displaced populations throughout the northern continents. different models of the effects of these climate-driven events predict distinct phylogeographic and population genetic outcomes for high-latitude faunas. the role of glaciations in (i) promoting intraspecific genetic differentiation and (ii) influencing genetic diversity was tested within a phylogeographic framework using the rodent microtus oeconomus. the spatial focus for the ...200414653795
density-dependent dispersal and spatial population dynamics.the synchronization of the dynamics of spatially subdivided populations is of both fundamental and applied interest in population biology. based on theoretical studies, dispersal movements have been inferred to be one of the most general causes of population synchrony, yet no empirical study has mapped distance-dependent estimates of movement rates on the actual pattern of synchrony in species that are known to exhibit population synchrony. northern vole and lemming species are particularly well ...200516024345
significant morphological but little molecular differences between trypanosoma of rodents from alaska.we examined blood smears of 173 rodents and 33 shrews captured at 4 sites in the gates of the arctic national park, northern alaska, in summer 2002. trypanosoma spp. were detected in the plasma of 5 microtus oeconomus, 4 microtus miurus, and 1 lemmus trimucronatus. the trypomastigote morphology from different individuals of m. oeconomus caught at the same site and of m. miurus from different sites varied significantly. the 4 dna sequences obtained from the blood smear positive samples contained ...200515856904
[the parameters of antioxidant status of tissues in the offspring of tundra vole (microtus oeconomus pall.) inhabiting areas with increased natural radioactivity].the parameters of the lipid peroxidation regulatory system (the antioxidative and antiperoxidant activities, the peroxide content, the lipid peroxidation intensity) in the tissues and the activities of the antioxidative defence enzymes (the peroxidase activity in blood, the superoxide dismutase activity in the blood erythrocytes) are studied in progeny of tundra vole which are reproduced from parent inhabiting areas with different radioecological environment during a long time. the progeny had t ...200516209195
babesia microti: prevalence in wild rodents and ixodes ricinus ticks from the mazury lakes district of north-eastern poland.infections of babesia microti (apicomplexa, piroplasmida), a common erythroparasitic protozoon of holarctic rodents, are not widely acknowledged in poland. the presence of this parasite in various species of wild rodents has been well documented throughout the northern temperate zone of north america, europe, and eurasia. however, human babesiosis attributable to infection with b. microti has been reported only from the north-eastern and upper midwestern united states and japan. we recently carr ...200616524774
[phospholipids content in tissues of microtus oeconomus living in the areas with elevated level of radiation]. 200616808279
the root-vole microtus oeconomus (pallas, 1776): a new potential reservoir of anaplasma phagocytophilum.anaplasma phagocytophilum infection is a recently emerged tick-borne zoonosis. the bacterium's reservoirs likely comprise cervids, some ruminants, rodents, and perhaps other small and intermediate-size mammals; the main vector in europe is the ixodes ricinus tick. the białowieza primeval forest is an ecosystem with a known prevalence of tick-borne pathogens. we studied the root-vole microtus oeconomus to evaluate the natural infection of a. phagocytophilum. intragranulocytic bacterial clusters ( ...200616989562
[seasonal changes in the energy metabolism of subarctic rodents].in widespread species, northern taiga voles, most significant differences in the intensity of energy metabolism (m), maximum (mmax) and reserve (mres) metabolism were observed at winter temperatures (-5-20 degrees c): clethrionomys rutilus greater than c. rufocanus greater than microtus oeconomus; differences in seasonal increase of mmax and mres exhibit an inverse proportion. seasonal changes in m and mmax in autochthonous tundra rodents indicate that lemmus sibiricus belongs to a more eurybion ...20062596207
[seasonal changes in the brain and skull sizes of small mammals].a comparative study of seasonal-age dynamics of brain size in six small mammal species, clethrionomys glareolus, c. rutilus, microtus oeconomus, m. gregalis (rodentia); sorex araneus, s. minutis (insectivora) has been carried out. the analysis of seasonal changes in brain weight confirms the existence of autumn-winter regression of brain weight, which takes place at the organism level. the regression is less pronounced in voles than in shrews. the decrease in brain weight both in voles and in sh ...20062800709
[effect of low doses of ionizing radiation on bone marrow cell chromosomes in microtus oeconomus pall].it is shown that microtus oeconomus pall. living in conditions of enhanced natural radioactive background do not suffer from the increased radioactivity with regard to the induction of cytogenetic disturbances in bone marrow cells. it is supposed that these animals are more radioresistant than microtus oeconomus pall. living in vivaria.20063909214
[effect of chronic gamma irradiation on dehydrogenase activity in the tissues of root voles and their progeny dwelling in a habitat with increased radioactivity].chronic gamma-irradiation during 3.5 and 6 months (at a dose = rate of 46.2 pc/kg x c) of microtus oeconomus living in conditions of normal and increased (by 50-100 times) gamma-radiation background, and of their progeny (the 1st, 2nd, 3d, and 4th generations) causes in homogenates of cardiac muscle, liver, and brain different changes in activity of succinate dehydrogenase (1.3.99.1, ec), pyruvate dehydrogenase (1.2.4.1, ec), and lactate dehydrogenase (1.1.1.27, ec) associated with the discordan ...20063554319
[embryonic mortality of the root vole as an index of the effect of small doses of natural radioactivity on genetic processes in populations].a study was made of the pre- and post-implantation death of (f2--f4) microtus oeconomus progeny whose parents lived in territories where natural radiation background was increased (an exposition dose-rate of 3.6-144.0 pc/kg x s). the spontaneous rate of pre- and post-implantation death of progeny of irradiated (experimental) animals was higher than that of intact ones (control). the animals kept in conditions of chronic irradiation (46.2 pc/kg x s) exhibited a more pronounced discrepancy in embr ...20063547461
[the influence of population factors on phospholipid content of different tissues in lemmings microtus oeconomus in their natural habitat]. 200612070911
photoperiodic regulation in energy intake, thermogenesis and body mass in root voles (microtus oeconomus).the present study was designed to examine whether photoperiod alone was effective to induce seasonal regulations in physiology in root voles (microtus oeconomus) from the qinghai-tibetan plateau noted for its extreme cold environment. root voles were randomly assigned into either long photoperiod (ld; 16l:8d) or short photoperiod (sd; 8l:16d) for 4 weeks at constant temperature (20 degrees c). at the end of acclimation, sd voles showed lower body mass and body fat coupled with higher energy inta ...200617049448
small rodent winter survival: snow conditions limit access to food resources.1. in fennoscandia during winter small rodents spend most of their time in the subnivean space, between the snow cover and the ground. the subnivean space is probably not a uniform habitat, but broken into accessible and inaccessible patches by ice covering the vegetation. this might reduce access to otherwise available food resources. 2. to test whether ice formations reduce access to food and thus limit winter survival of small rodents, we conducted an experiment where we increased subnivean s ...200616903053
seasonal regulations of energetics, serum concentrations of leptin, and uncoupling protein 1 content of brown adipose tissue in root voles (microtus oeconomus) from the qinghai-tibetan plateau.survival of small mammals in winter requires proper adjustments in physiology, behavior and morphology. the present study was designed to examine the changes in serum leptin concentration and the molecular basis of thermogenesis in seasonally acclimatized root voles (microtus oeconomus) from the qinghai-tibetan plateau. in january root voles had lower body mass and body fat mass coupled with higher nonshivering thermogenesis (nst) capacity. consistently, cytochrome c oxidase activity and mitocho ...200616786335
male turnover reduces population growth: an enclosure experiment on voles.turnover of individuals is assumed to cause disruptions of social organization, followed by reduced reproduction and survival. we tested how male turnover (removal of resident males and their replacement by unfamiliar males) affected population performance in experimental root vole (microtus oeconomus) populations. the treatment simulated predation of adult males, with the subsequent replacement by immigrants, and provided insight into the interaction between extrinsic (i.e., predation) and intr ...200616634299
[a method of comparison of dna polynucleotide sequences].the results of a comparative analysis of the kinetic curves of reassociation of dna of closely related species of microtus (microtus arvalis, microtus oeconomus oeconomus, microtus oeconomus chachlovi) are presented. a five power polynomial was used as a mathematical model of the kinetic dna reassociation curves. the values of polynomial coefficients and the theoretical value, both with statistical deviations dispersion, have been estimated with the help of a standard computer programme. the mod ...2006765772
[effect of an increased level of natural radioactivity on the glycogen content of peripheral blood leukocytes in microtus oeconomus pall].in experiments on microtus oeconomus pall., living in natural conditions with normal (0.72-1.08 pa/kg) and increased (3.6-1440 pa/kg) levels of external gamma-irradiation and affected by numerous incorporated radionuclides, the differences were detected, by the cytochemical method, both in the total glycogen content of leucocytes and in the type of grouping of cells depending on the degree of their saturation with polysaccharide.20066393207
[comparative ultrastructural study of the inner medullary zone of the kidney of rodents with varying water access in the habitat environment].studies have been made on the papillary zone of the kidney in wild rodents microtus oeconomus, m. afganus, nesokia indica and rhombomus opimus, representing related taxonomic species but differing with respect to accessibility to water. in animals with high concentrating capacity, pronounced peculiarities of ultrastructure of descending and ascending parts of henle's loop, thin epithelial layer in the collecting tubules and poor development of interstitial tissue account for higher level of wate ...20067043961
[micronuclei in the peripheral blood cells of microtus oeconomus pall. that inhabit areas with enhanced natural radioactivity]. 2006368873
[blood plasma esterases of tundra voles (microtus oeconomus), living in conditions of increased levels of natural radiation]. 20064780337
[gamasid ticks of small mammals in the charskaya basin (gamasoidea)].zooparasitological investigation of small mammals (17 species) was carried out in one of the regions of construction of the baikal-amur main line, charskaya hollow. 8475 gamasid mites belonging to 8 families and represented by 25 species were collected. in addition, in the nests of the northern redbacked vole and root vole there were found gamasid mites belonging to 6 families. the mass species, haemogamasus ambulans thorell and hirstionyssus isabellinus oud., were recorded from all landscape zo ...2007481901
[the taxonomic independence of anoplocephaloides spp. (cestoda: anoplocephalidae) with serial alternation of the genital atria].the mutual dispositions of the genital apertures in the anoplocephalidean strobila and their taxonomical significance were considered. the irregular alternations of single genital apertures from the alternations of its seria on the proglottid margins could be distinguished. the serial alternation as an intermediate type in the transformation from the irregular to unilateral dispositions of the genital apertures were considered. the conclusion about the anoplocephaloides spp. with the serial alte ...20078984444
biological consequences of increased natural radiation background for microtus oeconomus pall. populations.the results of long-term investigations (1981-1999) on the state of microtus oeconomus pall. (tundra vole) population, living under the increased natural radiation background for a long time (for more than 100 generations), are presented. population density dynamics, morphophysiological parameters, state of the lipid peroxidation regulatory system in different tissues and the cytogenetic effects in bone marrow cells of animals have been analyzed. it is shown that tundra voles from the studied ra ...200717467125
[spatio-temporal interrelations of three sympatric species of voles (mammalia: rodentia) in the south urals].the structural and functional organization and the spatio-temporal interrelations of three sympatric vole species (microtus oeconomus, clethrionomys, rutilus, and c. rufocanus) were analyzed on territories different in the type of their functional significance to the animals (survival stations, zones of temporary dispersal, and transit zones). the study was conducted in the environs of the iremel massif (54 degrees 31'25" n 58 degrees 50'18" e) in 1979-1981, in four 1 ha marking-areas in four di ...200718257290
diversities in hepatic hif-1, igf-i/igfbp-1, ldh/icd, and their mrna expressions induced by cocl(2) in qinghai-tibetan plateau mammals and sea level mice.ochotona curzoniae and microtus oeconomus are the native mammals living on the qinghai-tibetan-plateau of china. the molecular mechanisms of their acclimatization to the plateau-hypoxia remain unclear. expressions of hepatic hypoxia-inducible factor (hif)-1alpha, insulin-like growth factor-i (igf-i)/igf binding protein (bp)-1(igfbp-1; including genes), and key metabolic enzymatic genes [lactate dehydrogenase (ldh)-a/isocitrate dehydrogenase (icd)] are compared in qinghai-tibetan-plateau mammals ...200716990490
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