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identification of a novel hantavirus strain in the root vole (microtus oeconomus) in lithuania, eastern europe.hantaviruses are zoonotic pathogens that can cause subclinical to lethal infections in humans. in europe, five orthohantaviruses are present in rodents: myodes-associated puumala orthohantavirus (puuv), microtus-associated tula orthohantavirus, traemmersee hantavirus (trav)/ tatenale hantavirus (tatv)/ kielder hantavirus, rat-borne seoul orthohantavirus, and apodemus-associated dobrava-belgrade orthohantavirus (dobv). human puuv and dobv infections were detected previously in lithuania, but the ...202032890767
associations between different laelapidae (mesostigmata: dermanyssoidea) mites and small rodents from lithuania.associations between species of laelapidae (mesostigmata: dermanyssoidea) mites and small rodents have been studied insufficiently. the aim of this study was to investigate infestation patterns of small rodent species by laelapid mites at six locations in lithuania. a total of 728 rodents were snap- and live-trapped in various locations during 2013-2016. eight rodent species were identified, namely apodemus flavicollis, apodemus agrarius, myodes glareolus, micromys minutus, mus musculus, microtu ...202032307619
gonads or body? differences in gonadal and somatic photoperiodic growth response in two vole species.to optimally time reproduction, seasonal mammals use a photoperiodic neuroendocrine system (pnes) that measures photoperiod and subsequently drives reproduction. to adapt to late spring arrival at northern latitudes, a lower photoperiodic sensitivity and therefore a higher critical photoperiod for reproductive onset is necessary in northern species to arrest reproductive development until spring onset. temperature-photoperiod relationships, and hence food availability-photoperiod relationships, ...202032917818
geographical distribution of ljungan virus in small mammals in europe.ljungan virus (lv), which belongs to the parechovirus genus in the picornaviridae family, was first isolated from bank voles (myodes glareolus) in sweden in 1998 and proposed as a zoonotic agent. to improve knowledge of the host association and geographical distribution of lv, tissues from 1685 animals belonging to multiple rodent and insectivore species from 12 european countries were screened for lv-rna using reverse transcriptase (rt)-pcr. in addition, we investigated how the prevalence of lv ...202032487013
the competition between immatures of ixodes ricinus and dermacentor reticulatus (ixodida: ixodidae) ticks for rodent hosts.the numbers of ixodes ricinus (l.) and dermacentor reticulatus (fabricius) larvae and nymphs attached to small mammals are influenced by interspecific competition. the present study analyses data collected over several years in two study areas: kosewo górne (mazurian district, n poland; between july 1997 and july 2009) and białowieża primeval forest (e poland; in july 2007). in total, 975 ticks were collected from striped field mice (apodemus agrarius), yellow-necked mice (a. flavicollis), bank ...201930346558
larval spirurids in a supralittoral amphipod in the north-east of russia and the identification of the intermediate host of antechiniella septentrionalis (spirurida: acuariidae), parasitic in a tundra vole.the supralittoral amphipod traskorchestia ditmari (derzhavin, 1923) was identified as the intermediate host for antechiniella septentrionalis ivanova, dokuchaev & spiridonov, 2019, a parasite of the tundra vole microtus oeconomus and skrjabinocerca sp. (both spirurida: acuariidae) in magadan oblast in north-eastern russia. joint infection by both larval spirurids was not observed. the infective stage of a. septentrionalis was the encysted larvae, while larvae of skrjabinocerca sp. were free in t ...201931514757
first record of natural baylisascaris transfuga (ascaridoidea, nematoda) infection in wild rodents.the intestinal parasitic nematode, baylisascaris transfuga, was recorded in wild rodents for the first time. representatives of four murid species (15 myodes rufocanus, 10 m. rutilus, 3 m. glareolus and 27 microtus oeconomus) were collected in the white sea coastal habitats in the south of the kola peninsula, russia in july 2015 and examined for parasites. encapsulated nematode larvae were detected in the mesentery and the large intestine wall of one grey-sided vole (m. rufocanus) and one tundra ...201931452476
synergistic effects of predation and parasites on the overwinter survival of root voles.predators and parasites have been important extrinsic factors influencing the fluctuation of small mammal populations. they can have non-additive effects on a shared group of preys or hosts, which can have important consequences for population dynamics. however, experimental studies incorporating the interactions between predation and parasites are scarce in small mammal populations. here we systematically examined the synergistic effects of predators and coccidian parasites interaction on overw ...201931332519
antechiniella septentrionalis n. sp. (spirurida: acuariidae), a new intestinal nematode parasite of the tundra vole microtus oeconomus (pallas) (rodentia: muridae) in the north-east of russia.antechiniella septentrionalis n. sp. (spirurida: acuariidae) is described from the duodenum of a tundra vole, microtus oeconomus (pallas), collected in the magadan region in the north-east part of russia. it differs from a. suffodiax (beveridge & barker, 1975) and a. sertatum smales, 1991 mainly in having a larger number of postcloacal papillae (5-6 pairs vs 4 pairs), a differently shaped left spicule, the disposition of precloacal papillae in two rows vs one, and oblong vs oval eggs. other ...201929759087
[a case of the tick (ixodidae) hiperinvasion of the tundra vole in magadan environs].a case of tundra vole death as a result its hyperinvasion by ticks ixodes angustus on the northern periphery of the asiatic range of the parasite is given.201829401575
bartonella infections in three species of microtus: prevalence and genetic diversity, vertical transmission and the effect of concurrent babesia microti infection on its success.bartonella spp. cause persistent bacterial infections in mammals. although these bacteria are transmitted by blood-feeding arthropods, there is also evidence for vertical transmission in their mammalian hosts. we aimed to determine: (i) the prevalence and diversity of bartonella spp. in a microtus spp. community; (ii) whether vertical transmission occurs from infected female voles to their offspring; (iii) the effect of concurrent babesia microti infection on the success of vertical transmission ...201830165879
taxonomic position of chinese voles of the tribe arvicolini and the description of 2 new species from xizang, china.china has 26 species in the tribe arvicolini. the taxonomic status of these voles remains controversial despite much effort. herein, we evaluate the taxonomic position of 22 species plus 2 unidentified taxa using mitochondrial dna gene sequences (cytb + co1). we also evaluate 18 species and 2 unidentified taxa using morphological data. phylogenetic analyses of cytb resolve monophyly for the genera alexandromys, lasiopodomys, microtus, neodon, proedromys, and volemys with strong support. stenocra ...201729674783
prevalence, genetic identity and vertical transmission of babesia microti in three naturally infected species of vole, microtus spp. (cricetidae).vertical transmission is one of the transmission routes for babesia microti, the causative agent of the zoonotic disease, babesiosis. congenital babesia invasions have been recorded in laboratory mice, dogs and humans. the aim of our study was to determine if vertical transmission of b. microti occurs in naturally-infected reservoir hosts of the genus microtus.201728166832
metagenomic evaluation of bacteria from voles.voles (arvicolinae, rodentia) are known carriers of zoonotic bacteria such as bartonella spp. and francisella tularensis. however, apart from f. tularensis, the bacterial microbiome of voles has not previously been determined in finland and rarely elsewhere. therefore, we studied liver samples from 61 voles using 16s ribosomal rna gene pcr analysis, followed by sanger sequencing. twenty-three of these samples were also studied with tag-encoded pyrosequencing. the samples originated from 21 field ...201727854567
the nexus of hair corticosterone level, immunocompetence, metabolic rates and overwinter survival in the root vole, microtus oeconomus.although corticosterone (cort) regulates many physiological mechanisms, the associations between cort levels, immunocompetence, energy expenditures and overwinter survival have not been examined. here, we studied individual variation in cort level extracted from hair, immunocompetence quantified as the neutrophil-to-lymphocyte (n/l) ratio, total white blood cells (wbc) and natural antibody levels (nabs), along with the resting (rmr) and peak metabolic rates (pmr) and mortality during three conse ...201728577898
heterogeneity of 90sr radioactive contamination at the head part of the east ural radioactive trace (eurt).1: we measured 90sr concentrations and beta particle flux density (bpfd) in 44 soil samples collected from four soil profiles across a central transect on the head of the east ural radioactive trace (eurt). the relationship between bpfd and 90sr concentration of each soil sample can be characterised by a linear regression model; 90sr concentration in the upper 12 cm soil layer can thus be assessed by measuring bpfd in the soil surface. 2: the bpfd on the soil surface was measured at 969 points a ...201727890298
[some aspects of structural alterations of erythrocyte membranes under the effect of uranyl chloride at low concentrations].the influence of nanomolar concentrations of the uranyl ion on the parameters of some membrane structures of rodent erythrocytes (laboratory mice and tundra voles--classical objects of radioecological monitoring) was investigated in vitro. a high sensitivity of the tundra vole red blood cells to the uranyl influence was shown. this fact may be determined by the cross-species difference in the membrane structures of erythrocytes--the low sphingomyelin content in tundra voles. investigation into t ...201725962280
individual age and odontologic characteristics of root vole. 201723129279
[characteristics of erythrocyte lipids in blood of tundra voles (microtus oeconomus pall.) inhabiting areas with increased natural radioactivity].interrelations between the lipid characteristics of the blood erythrocytes and 226ra accumulation in the body of tundra voles (microtus oeconomus pall.) inhabiting areas with different levels of the radiation background were investigated. it is shown that the ratio of the phospholipid (pl) fractions which cause the blood erythrocyte structure depends on the phase of the population cycle, as well as on the sex and age of tundra voles. the statistically significant interrelation between lysoforms ...201622279775
[adaptive reactions of dehydrogenation processes in root voles during additional impacts of the physical nature].variations of the dehydrogenation enzyme activity (succinate dehydrogenase, pyruvate dehydrogenase, lactate dehydrogenase) in the heart muscle, liver and brain of root voles (microtus oeconomus pall.) and their progeny associated with additional stress effects (chronic low-level gamma-irradiation, short-term exposure to cold) have been studied. root voles (parents) were caught in the areas with a normal and high-level natural radioactivity in the republic of komi. it has been revealed that the d ...201622279768
the synergistic effect of density stress during the maternal period and adulthood on immune traits of root vole (microtus oeconomus) individuals-a field experiment.the literature reveals that stress in early life or adulthood can influence immune function. as most studies on this are from the laboratory, there is a need for replicated studies in wild animals. this study aims to examine the effects of density stress during the maternal period and adulthood on immune traits of root vole (microtus oeconomus) individuals. four replicated high- and low-density parental populations were established, from which we obtained offspring and assigned each into four en ...201626373286
de novo lipogenesis is suppressed during fasting but upregulated at population decline in cyclic voles.arvicolines are susceptible to the development of fatty liver during short-term fasting. we examined the potential role of de novo lipogenesis (dnl) (i) in the development of fasting-induced fatty liver and (ii) during a population cycle by measuring the mrna expression of acetyl-coa carboxylase-1 (acc1) and fatty acid synthase (fas). laboratory voles (microtus oeconomus and microtus arvalis) were fed or fasted for 12 or 18 h and their liver mrna levels were determined. both species showed decre ...201626892709
[morphological variability of microtus oeconomus pallas (rodentia, rrvicolidae) from baikal region].the analysis of morphological variability of the ten samples of microtus oeconomus from islands of baikal and adjacent regions gas shown, that island samples differ from continental ones by complex of parameters, defining proportions of a skuul, mainly, proportions of an auditory region. island samples also differ higher indexes of complexity and asymmetry of morphotypes of the third upper molar. an environment of the baikal islands differ absence of the damp habitats preferred microtus oeconomu ...201617168467
[function of the thyroid gland of tundra voles living on sites with the increased natural radioactivity].we studied a functional condition of the thyroid gland of tundra voles living on sites with the increased level of a natural radioactivity (in republic komi areas in russia). we have revealed that the functional condition of the thyroid gland depends on the phase of the population cycle of animals. the level of thyroid hormones in the irradiated animals differed from the norm; a high concentration of hormones in the irradiated animals was observed in the phase of the maximum number of animals, w ...201624450213
[complex estimation of thyroid gland state in tundra voles, inhabiting the natural radioactive polluted sites].behow is presented the complex state of thyroid gland of tundra voles living in high level natural radioactivity conditions (ukhta region of komi republic) by morphological and functional criteria. high sensitivity of thyroid gland under natural chronic irradiation of whole organism is noticed. the essential changes in the morphological structure and in the hormone level of the thyroid gland are found in animals, which live for a long time in the conditions of the radioactive pollution. it is de ...201616080630
[monitoring of tundra vole (microtus oeconomus pall.) population inhabiting areas with increased radiation background].the data of complex examinations of morphophysiological state of tundra vole (microtus oeconomus pall.), the lipid peroxidation (lpo) processes and the energy exchange in their organs, the cytogenetic analysis of marrow cells and the process of multiplication in populations inhabiting areas with increased natural radiation background more 50 years are generalized. the data obtained support the existence of qualitative differences of tundra vole subpopulations inhabiting control and radioactive n ...201615287255
[spatiotemporal dynamics of the vole populations in heterogeneous habitats of the iremel mountain range].specific features of seasonal changes in the demographic structure and distribution of three vole species were studied in heterogeneous, qualitatively different habitats of three altitudinal belts in the southern ural. the results showed that the fauna of small mammals in the mountain-forest, subgoltsy, and mountain-tundra belts of the iremel' mountain range could be regarded as metapopulations of the northern red-backed vole, large-toothed red-backed vole, and root vole, and the fauna of each b ...201615131988
[embryonic malformations in rodents in forest communities of the bryansk region exposed to radioactive pollution].embryonic malformations have been described and classified in small forest rodents (microtus oeconomus, clethrionomys glareolus), which had several generations living on the radioactively contaminated territory and were exposed to small doses of radiation (140-200 mkr/h).20169467640
the transstadial persistence of tick-borne encephalitis virus in dermacentor reticulatus ticks in natural conditions.there are a number of reports regarding natural infection of dermacentor reticulatus ticks with tbe virus; however, the transmission mode of tbe virus in this tick population has not been investigated. this study was conducted in białowieża primeval forest, east poland. forty fully engorged nymphs of d. reticulatus were sampled from root voles (microtus oeconomus). ticks were kept until molting. all ticks were screened for the presence of tbe virus by nested rt-pcr. three adult ticks were positi ...201626751892
[cytogenetic indices for somatic mutagenesis in mammals exposed to chronic low-dose irradiation].we used cytogenetic analysis in the studies of the biological effects of a radiation factor of natural and artificial origin (under conditions ofthe 30-km exclusion zone ofthe chernobyl experimental landfills in ukraine, belarus and russia). the studies have been performed on various types of mammals: domestic animals--cows, pigs, horses and rodents--root voles, the af mouse line, and yellow necked field mouse, bank voles. we found significant changes in the level of mn and chromosomal aberratio ...201625962274
[developmental instability of the organism as a result of pessimization of environment under anthropogenic transformation of natural landscapes].the value of fluctuating asymmetry is considered to be an indicator of the developmental instability of the organism. the consequences of activities of the mining industry plants, which are characterized by alienation and transformation of large areas of natural landscapes, are analyzed as an anthropogenic factor. the objects of study were small mammals (northern red-backed (clethrionomys rutilus) and gray red-backed (clethrionomys rufocanus) voles, tundra vole (microtus oeconomus), laxmann's (s ...201525720274
effect of the abrasive properties of sedges on the intestinal absorptive surface and resting metabolic rate of root voles.recent studies on grasses and sedges suggest that the induction of a mechanism reducing digestibility of plant tissues in response to herbivore damage may drive rodent population cycles. this defence mechanism seems to rely on the abrasive properties of ingested plants. however, the underlying mechanism has not been demonstrated in small wild herbivores. therefore, we carried out an experiment in which we determined the joint effect of abrasive sedge components on the histological structure of s ...201525524975
contribution of quantitative methods of estimating mortality dynamics to explaining mechanisms of aging.accumulation of various types of unrepaired damage of the genome because of increasing production of reactive oxygen species and decreasing efficiency of the antioxidant defense system and repair systems can cause age-related diseases and emergence of phenotypic signs of senescence. this should lead to increasing vulnerability and to mortality monotonously increasing with age independently of the position of the species on the evolutionary tree. in this light, the survival, mortality, and fertil ...201526638679
maternal effects and population regulation: maternal density-induced reproduction suppression impairs offspring capacity in response to immediate environment in root voles microtus oeconomus.the hypothesis that maternal effects act as an adaptive bridge in translating maternal environments into offspring phenotypes, and thereby affecting population dynamics has not been studied in the well-controlled fields. in this study, the effects of maternal population density on offspring stress axis, reproduction and population dynamics were studied in root voles (microtus oeconomus). parental enclosures for breeding offspring were established by introducing six adults per sex into each of 4 ...201525327547
shaving increases daily energy expenditure in free-living root voles.experimental manipulation of energy expenditure has long been recognized as an effective means for identifying causative effects and avoiding confounded interpretations arising from spurious correlations. this approach has been successfully applied mainly to studies on birds, particularly on reproducing adults, whereas manipulations in mammals have proved more problematic. here, we tested the hypothesis that shaving off 50% of the dorsal pelage should effectively increase energy expenditure in w ...201425278468
chromosomal polymorphism in the peripheral population of the root vole mirotus oeconomus (rodentia, arvicolinae) of the valdai national park. 201424659283
relationships between dominance, testosterone level and scent marking of males in a free-living root vole (microtus oeconomus) population.in many species, dominance increases a male's mating success via intrasexual competition and/or female choice. the level of androgen hormones, mainly testosterone (t), the intensity of scent marking and body mass are traits that are known to be linked to mammalian male social rank. recently, however, it has been noted that this link between male dominance and the aforementioned traits in natural free-living populations is not universal and does not exist in some species. that is why we tested th ...201424522243
reliability assessment of null allele detection: inconsistencies between and within different methods.microsatellite loci are widely used in population genetic studies, but the presence of null alleles may lead to biased results. here, we assessed five methods that indirectly detect null alleles and found large inconsistencies among them. our analysis was based on 20 microsatellite loci genotyped in a natural population of microtus oeconomus sampled during 8 years, together with 1200 simulated populations without null alleles, but experiencing bottlenecks of varying duration and intensity, and 1 ...201424119056
immunocompetence and high metabolic rates enhance overwinter survival in the root vole, microtus oeconomus.despite its presumed significance, the association between immune defence, energy expenditures and overwinter survival is rarely studied. we analysed individual variation in immunocompetence quantified as neutrophil-to-lymphocyte ratio (n/l), total white blood cells (wbc) and natural antibody levels, along with resting (rmr) and peak metabolic rates (pmr) and mortality during three consecutive winter seasons in a natural population of the root vole, microtus oeconomus. in early winter, wbc count ...201425519753
bears are simply voles writ large: social structure determines the mechanisms of intrinsic population regulation in mammals.the literature reveals opposing views regarding the importance of intrinsic population regulation in mammals. different models have been proposed; adding importance to contrasting life histories, body sizes and social interactions. here we evaluate current theory based on results from two scandinavian projects studying two ecologically different mammal species with contrasting body sizes and life history traits: the root vole microtus oeconomus and the brown bear ursus arctos. we emphasize four ...201424481982
indirect food web interactions mediated by predator-rodent dynamics: relative roles of lemmings and voles.production cycles in birds are proposed as prime cases of indirect interactions in food webs. they are thought to be driven by predators switching from rodents to bird nests in the crash phase of rodent population cycles. although rodent cycles are geographically widespread and found in different rodent taxa, bird production cycles appear to be most profound in the high arctic where lemmings dominate. we hypothesized that this may be due to arctic lemmings inducing stronger predator responses th ...201324173526
codon 104 variation of p53 gene provides adaptive apoptotic responses to extreme environments in mammals of the tibet plateau.mutational changes in p53 correlate well with tumorigenesis. remarkably, however, relatively little is known about the role that p53 variations may play in environmental adaptation. here we report that codon asparagine-104 (104n) and glutamic acid-104 (104e), respectively, of the p53 gene in the wild zokor (myospalax baileyi) and root vole (microtus oeconomus) are adaptively variable, meeting the environmental stresses of the tibetan plateau. they differ from serine-104 (104s) seen in other rode ...201324297887
[morphometric analysis of follicular structure of the thyroid gland after chronic low-dose gamma-irradiation].a quantitative study of follicle average cross-sectional diameter distribution was conducted in the thyroid gland (tg) of mouse like rodents (25 tundra voles, 24 cba mice, 16 wistar rats) after chronic exposure to low-level external y-radiation both in the environment and under the experimental condition (absorbed dose range 0.05-0.5 gy). spectrum analysis of tg follicle cross-sectional diameter distribution in the irradiated animals has demonstrated a universal regularity: in comparison with th ...201323898721
arctic small rodents have diverse diets and flexible food selection.the ecology of small rodent food selection is poorly understood, as mammalian herbivore food selection theory has mainly been developed by studying ungulates. especially, the effect of food availability on food selection in natural habitats where a range of food items are available is unknown. we studied diets and selectivity of grey-sided voles (myodes rufocanus) and tundra voles (microtus oeconomus), key herbivores in european tundra ecosystems, using dna metabarcoding, a novel method enabling ...201323826371
distinct post-transcriptional regulation of igfbp1 gene by hypoxia in lowland mouse and qinghai-tibet plateau root vole microtus oeconomus.our previous study revealed the particular expression patterns of insulin-like growth factor 1 (igf1) and insulin-like growth factor binding protein 1 (igfbp1) in the qinghai-tibet plateau root vole (microtus oeconomus) under hypoxic challenge. here we report the molecular mechanisms of igf gene regulation associated with adaptation to hypoxia. m. oeconomus igf1 and igfbp1 were shown to be highly conserved. hypoxia (8.0% o2, 6h) did not change the liver-derived igf1 expression in either m. oecon ...201323748030
the role of colonization in the dynamics of patchy populations of a cyclic vole species.the crash phase of vole populations with cyclic dynamics regularly leads to vast areas of uninhabited habitats. yet although the capacity for cyclic voles to re-colonize such empty space is likely to be large and predicted to have become evolved as a distinct life history trait, the processes of colonization and its effect on the spatio-temporal dynamics have been little studied. here we report from an experiment with root voles (microtus oeconomus) specifically targeted at quantifying the proce ...201323443355
local and regional determinants of colonisation-extinction dynamics of a riparian mainland-island root vole metapopulation.the role of local habitat geometry (habitat area and isolation) in predicting species distribution has become an increasingly more important issue, because habitat loss and fragmentation cause species range contraction and extinction. however, it has also become clear that other factors, in particular regional factors (environmental stochasticity and regional population dynamics), should be taken into account when predicting colonisation and extinction. in a live trapping study of a mainland-isl ...201323437137
[cytogenetic research on micropopulations of the root vole (microtus oeconomus pall.) living under various radioecological habitat conditions].percentage of aneuploid cells and that of cell with chromosome aberrations in microtus oeconomus pall. living in areas with the enhanced radiation background (the dose of external radiation is 50 times and that of internal irradiation of bone marrow by incorporated 226ra 10 times higher than the controls) exceeds significantly (p less than 0.05) the control values. it is concluded that mutations occur in the experimental animals more frequently than in the controls.20133041438
[effect of increased natural radioactivity on bone marrow morphology of microtus oeconomus pall].it was established that microtus oeconomus pall. living in territories with the increased radiation background exhibit focal myeloid hyperplasia in the bone marrow, changes in the maturation indices of erythroid and myeloid elements, increase in number of karyocytes due to the increase in their mitotic activity. it is suggested that activation of vole haemopoiesis is an adaptive reaction of the organism to the effect of the radioecological factor.20136374747
manifestations of fasting-induced fatty liver and rapid recovery from steatosis in voles fed lard or flaxseed oil lipids.long-chain n-3 polyunsaturated fatty acids (pufa) can have beneficial effects against fat deposition, cardiovascular diseases, and liver steatosis. we investigated how diets based on lard (predominantly saturated and monounsaturated fatty acids) or flaxseed oil (rich in 18:3n-3) affect liver fat-% and fatty acid profiles of tundra voles (microtus oeconomus). we also studied potential participation of hyaluronan (ha) in the pathology of fatty liver and whether the development and recovery of fast ...201324152753
parasite diversity at the holarctic nexus: species of arostrilepis (eucestoda: hymenolepididae) in voles and lemmings (cricetidae: arvicolinae) from greater beringia.previously unrecognized species of hymenolepidid cestodes attributable to arostrilepis mas-coma & tenora, 1997 in arvicoline rodents from the greater beringian region and western north america are described. discovery and characterization of these tapeworms contributes to the recognition of a complex of cryptic species distributed across the holarctic region. three species are proposed: arostrilepis gulyaevi sp. n. is named for cestodes in myodes rufocanus from the republic of buryatia, southeas ...201324614481
a new intermediate host for echinococcus multilocularis: the southern red-backed vole (myodes gapperi) in urban landscape in calgary, canada.human alveolar echinococcosis (hae) is a potentially fatal parasitic disease caused by echinococcus multilocularis, a cestode characterized by a sylvatic life-cycle involving several species of rodents and lagomorphs as intermediate hosts and canids as definitive hosts. despite the wide distribution of the parasite in north america, the number of competent intermediate host species identified to date is still relatively small, and mainly includes the northern vole (microtus oeconomus), brown lem ...201323608104
cytochrome b gene (cytb) sequence diversity in a microtus oeconomus population from bialowieza primeval forest.based on published information about the glacial, postglacial, and recent distribution of the root vole, microtus oeconomus, we hypothesized that a population inhabiting the pristine wetland in eastern poland (bialowieza primeval forest) might comprise a high diversity of haplotypes. the support for this hypothesis was provided by an analysis of partial cytb gene sequences from 149 voles sampled within a two-hectare plot during a nine-year study. in this population, we identified eight haplotype ...201223538781
cyclic voles and shrews and non-cyclic mice in a marginal grassland within european temperate forest.cyclic population dynamics of small mammals are not restricted to the boreal and arctic zones of eurasia and north america, but long-term data series from lower latitudes are still less common. we demonstrated here the presence of periodic oscillations in small mammal populations in eastern poland using 22-year (1986-2007) trapping data from marginal meadow and river valley grasslands located in the extensive temperate woodland of białowieża primeval forest. the two most common species inhabitin ...201222707756
vole preference of bilberry along gradients of simulated moose density and site productivity.browsing by large herbivores might either increase or decrease preference for the plant by other herbivores, depending on the plant response. using a cafeteria test, we studied the preference by root voles (microtus oeconomus [pallas, 1776]) for bilberry (vaccinium myrtillus l.) previously subjected to 4 levels of simulated moose (alces alces [linnaeus, 1758]) density. the different levels of moose density were simulated at population densities relevant for fennoscandian conditions, in exclosure ...201122182326
[comparative analysis of phospholipid composition in erythrocytes of mouse-like rodents of different species].comparative analysis of phospholipid quantitative composition of blood erythrocytes has been performed in white (laboratory mice and rats) and wild (tundra voles) mouse-like rodents. a non-characteristic of mammals low relative content of sphingomyelin is revealed in erythrocyte phospholipids in tundra voles. a hypothesis is put forward that the unique composition of erythrocyte lipids is a peculiar evolutionary developed strategy of adaptation aimed at survival under condition of constant circu ...201121598700
[Southern taiga combined natural foci of spirochetoses].Study of possibility of existence of combined natural foci of spirochetoses (ixodes tick borrelioses and leptospiroses) in typical taiga forests, and their etiologic and reservoir-host structure.201122145345
is there a linkage between metabolism and personality in small mammals? the root vole (microtus oeconomus) example.significant inter-individual variation in the rate of animal metabolism is a widespread phenomenon that has started to accumulate general interest. here we follow recent calls to focus on linkage between the variation in energy metabolism and animal personality. by using wild caught root voles as a study species, we examined the relationship between the behavioral patterns (assessed in open field test) and resting metabolic rate (rmr), both of which are known to show large individual differences ...201121536058
effects of individual condition and habitat quality on natal dispersal behaviour in a small rodent.1. individuals should benefit from settling in high-quality habitats, but dispersers born under favourable conditions have a better physical condition and should therefore be more successful at settling in high-quality habitats. 2. we tested these predictions with root voles (microtus oeconomus) by a manipulation of individual condition through litter-size enlargement and reduction during lactation combined with a manipulation of habitat quality through degradation of the vegetation cover. we ac ...201121521215
[action of the radioactive environment contamination on the age changes of the lipid peroxidation state in the rodent tissues].influence of the environment radioactive contamination on the age changes of the lipid peroxidation state in the microtus oeconomus tissues (rodents caught in the komi republic areas and in the chernobyl accident zone) was studied. the data show that action extent depends on the external y-radiation level in the trapping areas, the animal sex and the supply of the tissue lipids by antioxidants.201021137215
[correlation of phospholipid composition and physicochemical characteristics of lipids in tissues of the root vole microtus oeconomus of different ages].there was performed a comparative analysis of phospholipids and of lipid physicochemical characteristics in spleen, blood erythrocytes, and liver of the root voles caught in the natural environmental habitation at different phases of the population cycle, as well as of the animals born and raised throughout the entire life in vivarium, depending on the animals' sex and age. the age-related changes in the phospholipid composition have been established to correlate with lipid physicochemical chara ...201020799606
self-grooming induced by sexual chemical signals in male root voles (microtus oeconomus pallas).sniffing is one-way animals collect chemical signals, and many males self-groom when they encounter the odor of opposite-sex conspecifics. we tested the hypothesis that sexual chemical signals from females can induce self-grooming behavior in male root voles (microtus oeconomus pallas). specifically, we investigated the sniffing pattern of male root voles in response to odors from the head, trunk, and tail areas of lactating and non-lactating females. the self-grooming behavior of males in respo ...201020117186
[ectoparasites and phoresants of the root vole (microtus oeconomus pall.) in the polesye].drainage melioration in the polesye resulted in a sharp increase in the number of tundra vole (microtus oeconomus pall.) which quickly included into the parasitocenosis of the drained land. there were found 26 parasitic and nonparasitic species of gamasoidea, 3 species of ixodidae and 2 species of trombiculidae, 10 species of aphaniptera, 3 species of anoplura but there was found no species specific only for the tundra vole. all found parasites occur on many hosts. this explains wide parasitic l ...20102976144
[the ectoparasite fauna of the root vole (microtus oeconomus pall.) on the territory of the priluki preserve in byelarus].there are 27 ectoparasites species recorded now on the root vole, microtus oeconomus in byelorussia. among them, 14 species are recorded for the first time in the territory of the republic.20108975211
[phospholipid composition of blood erythrocytes of tundra voles (microtus oeconomus pall.) inhabiting under different radioecological conditions].phospholipid composition has been studied in blood erythrocytes of tundra voles microtus oeconomus inhabiting territories with normal and increased levels of natural radioactivity at different phases of the populational cycle. it has been shown that rearrangement in the lipid component of blood erythrocyte membranes in tundra voles from radioactively polluted areas are associated with intensification of the lipid peroxidation (lpo) processes and are similar to those observed at the organism natu ...201020297668
temporally stable genetic variability and dynamic kinship structure in a fluctuating population of the root vole microtus oeconomus.genetic variability, kin structure and demography of a population are mutually dependent. population genetic theory predicts that under demographically stable conditions, neutral genetic variability reaches equilibrium between gene flow and drift. however, density fluctuations and non-random mating, resulting e.g. from kin clustering, may lead to changes in genetic composition over time. theoretical models also predict that changes in kin structure may affect aggression level and recruitment, le ...201020561198
utilisation of rodent species by larvae and nymphs of hard ticks (ixodidae) in two habitats in ne poland.the impact of host identity and habitat type on the density of hard ticks (ixodes ricinus and dermacentor reticulatus) infections on rodents in forest and abandoned field habitats in ne poland was investigated. ixodes ricinus was most abundant in the forest system, but d. reticulatus, although rarer, was most abundant in the field system. environmental humidity and the much lower density of rodents probably limited the abundance of i. ricinus larvae in the field system, although this tick was st ...201019421876
[the dynamics of tundra vole populations and accumulation of natural radionuclides in the territories with increased level of radioactive pollution].the analysis of natural radionuclide (226ra) contamination and tundra vole (microtus oeconomus pall.) relative number (from the sixties of 20-th century to 2007) reveals the impotent role of murine rodents in radionuclide migration. as a result of their pawing and of radionuclides carry-over by plants on the soil surface since the beginning of 1990 to present time the increase of 226ra content in animals from control and radioactive plots have been ascertain. in the plots under study tundra vole ...200919507685
[a novel fluorescence reagent for the analysis of trace free oestradiol and oestriol in urine by reversed-phase high performance liquid chromatography with fluorescence detection and mass spectrometry identification].a new fluorescent derivatization reagent, 10-ethyl-9-oxo-9, 10-dihydroacridine-2-sulfonyl chloride (easc), was synthesized. a pre-column derivatization with easc and reversed-phase high performance liquid chromatographic (rp-hplc) method with fluorescence (fl) detection and mass spectrometry (ms) identification was performed for the trace analysis of oestradiol (e2) and oestriol (e3) in urine. this reagent shows higher sensitivities in ultraviolet (uv), fl and ms detection than those of dansyl c ...200919626842
[voles (microtus schrank, 1798) of the russian far east: allozymic and karyological divergence].the intraspecific and interspecific differentiations of voles of the russian far east with respect to allozymic and karyotypic characteristics have been studied. the morphologically similar but karyotypically different species microtus oeconomus, m. fortis, m. maximowiczii, and m. sachaliensis are characterized by considerable allozymic differentiation. in these voles, the allozymic differentiation has been found to increase in the order adjacent populations-subspecies-species. the interspecific ...200919639872
analysing diet of small herbivores: the efficiency of dna barcoding coupled with high-throughput pyrosequencing for deciphering the composition of complex plant mixtures.in order to understand the role of herbivores in trophic webs, it is essential to know what they feed on. diet analysis is, however, a challenge in many small herbivores with a secretive life style. in this paper, we compare novel (high-throughput pyrosequencing) dna barcoding technology for plant mixture with traditional microhistological method. we analysed stomach contents of two ecologically important subarctic vole species, microtus oeconomus and myodes rufocanus, with the two methods. dna ...200919695081
multiple paternity in free-living root voles (microtus oeconomus).we used 10 microsatellite loci to determine the mating system and male reproductive success in a natural population of the root vole (microtus oeconomus). by genotyping 21 females and their 111 offspring (5.28+/-0.27 s.e. pups per female), we found evidence for multiple paternity in 38% of the litters sired by two or three males. paternity was not significantly skewed away from the null expectation of equal proportions of offspring sired in any of the multiple-sired litters, and the most success ...200919482071
[dependence of response reaction of root voles to low-intensity irradiation on the initial state of the tissue antioxidant system].there has been studied the response of antioxidant (ao) reaction of the tissue system of the root voles microtus oeconomus pall. whose parents belonged to the populations long inhabiting the republic komi regions with different degrees of radioactive contamination on an additional radiation action at low doses. differences have been revealed in the phospholipid content, activities of ao defense, intensities of processes of lipid peroxidation (lpo) in tissues of the vole offspring caught in the c ...200818669281
[the age characteristics of lipid peroxidation in tissues from wild rodents].the comparative analysis of the phospholipid composition and the physics-chemical characteristics of the spleen, blood erythrocytes and liver lipids of wild rodents of different age (microtus oeconomus pall.) was carried out. the interrelation between the age changes of the phospholipid composition in spleen and/or the antiperoxide activity and the content of peroxides in lipids was shown. the scale and direct of the age changes of the phospholipid composition depend on the tissue type, basic le ...200819432200
food deprivation in the common vole (microtus arvalis) and the tundra vole (microtus oeconomus).arvicolinae voles are small herbivores relying on constant food availability with weak adaptations to tolerate prolonged food deprivation. the present study performed a comparative analysis on the responses to 4-18 h of food deprivation in the common vole (microtus arvalis) and the tundra vole (microtus oeconomus). both species exhibited rapid decreases in the plasma and liver carbohydrate concentrations during phase i of fasting and the decline in the liver glycogen level was more pronounced in ...200817929028
genetic analysis of hantaviruses carried by myodes and microtus rodents in buryatia.hantavirus genome sequences were recovered from tissue samples of myodes rufocanus, microtus fortis and microtus oeconomus captured in the baikal area of buryatia, russian federation. genetic analysis of s- and m-segment sequences of buryatian hantavirus strains showed that myodes-associated strains belong to hokkaido virus (hokv) type while microtus-associated strains belong to vladivostok virus (vlav) type. on phylogenetic trees buryatian hokv strains were clustered together with m. rufocanus- ...200818190679
[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
chromosomal evolution of arvicolinae (cricetidae, rodentia). i. the genome homology of tundra vole, field vole, mouse and golden hamster revealed by comparative chromosome painting.cross-species chromosome painting has become the mainstay of comparative cytogenetic and chromosome evolution studies. here we have made a set of chromosomal painting probes for the field vole (microtus agrestis) by dop-pcr amplification of flow-sorted chromosomes. together with painting probes of golden hamster (mesocricetus auratus) and mouse (mus musculus), the field vole probes have been hybridized onto the metaphases of the tundra vole (microtus oeconomus). a comparative chromosome map betw ...200717497247
[influence of the chronic gamma-irradiation at the low doses during the near ontogenesis periods on the oxidative processes in rodent organs].it is shown that the effect of the low intensity gamma-irradiation at the dose of 5.5 cgy during the 4 months including the antenatal period causes the most substantial changes of the peroxide content in the liver and in brain lipids and of tba-reactive substances amount in organs and blood plasma of tundra vole f2 which are reproduced from parents during long-term inhabiting on the ra-contaminated area in the komi republic. the consequences of the chronic gamma-irradiation at the doses of 4 cgy ...200717953437
[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
[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
[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
[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
[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
[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
[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
[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
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
[the influence of population factors on phospholipid content of different tissues in lemmings microtus oeconomus in their natural habitat]. 200612070911
[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
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
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