Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| [weight and histological changes in the adrenal glands of the field mouse (microtus agrestis l.) as a function of the sexual state]. | 1955 | 13270470 | |
| some aspects of concomitant infections of plasmodia and schistosomes. i. the effect of schistosoma mansoni on the course of infection of plasmodium berghei in the field vole (microtus guentheri). | 1956 | 13381873 | |
| fertilization, early cleavage and associated phenomena in the field vole (microtus agrestis). | 1957 | 13405809 | |
| the oestrous cycle and gestation period in the lactating field vole, microtus agrestis. | 1957 | 13463230 | |
| light-induced changes in some endocrine organs of the vole (microtus agrestis). | 1957 | 13463242 | |
| [an unusual dermatosis in field mouse microtus agrestis l. caused by myocoptes tenax michael 1889 (acarina, listrophoridae) & the forgotten myocoptes sciurinus hennemann 1910]. | 1958 | 13558452 | |
| variations in the weight of the adrenal glands of the field vole, microtus agrestis. | 1961 | 13693185 | |
| seasonal changes in the gonads and accessory reproductive organs of the vole (microtus agrestis). | 1964 | 14181474 | |
| seasonal changes in the adenohypophysis of the vole (microtus agrestis). | 1964 | 14184079 | |
| [existence of an adrenal x zone in the red field vole (clethrionomys glareolus)]. | 1954 | 14365027 | |
| low levels of nucleotide diversity in mammalian y chromosomes. | sex chromosomes provide a useful context for the study of the relative importance of evolutionary forces affecting genetic diversity. the human y chromosome shows levels of nucleotide diversity 20% that of autosomes, which is significantly less than expected when differences in effective population size and sex-specific mutation rates are taken into account. to study the generality of low levels of y chromosome variability in mammalian genomes, we investigated nucleotide diversity in intron sequ ... | 2004 | 14595096 |
| resting and daily energy expenditures of free-living field voles are positively correlated but reflect extrinsic rather than intrinsic effects. | resting metabolic rates at thermoneutral (rmrts) are unexpectedly variable. one explanation is that high rmrts intrinsically potentiate a greater total daily energy expenditure (dee), but recent work has suggested that dee is extrinsically defined by the environment, which independently affects rmrt. this extrinsic effect could occur because expenditure is forced upwards in poor habitats or enabled to rise in good habitats. we provide here an intraspecific test for an association between rmrt an ... | 2003 | 14615588 |
| a highly divergent mitochondrial dna lineage of microtus agrestis in southern europe. | the mediterranean peninsulas constitute important areas for endemism and intraspecific variation, and are likely places for cryptic biodiversity. we assessed the phylogeographic pattern of field voles (microtus agrestis) in southern and central europe by sequence analysis of a 385-bp fragment of the mitochondrial cytochrome b gene in 74 specimens from 44 localities. the majority of samples consisted of skulls collected from owl pellets. the data revealed a highly distinct cytochrome b lineage in ... | 2004 | 14666134 |
| two-year study of examination of blood from wild rodents for the presence of antiborrelian antibodies. | the aim of our work was to find the positivity rate of antibodrrelian antibodies (igg) in wild-living rodents in a locality situated in north moravia, czech republic. results of a survey for heart rinses (172) and sera (2) antibodies to borrelia burgdorferi sensu lato (s.l.) from 6 species of 174 wild rodents from the northern part of the czech republic are presented. samples were obtained in 2001-2002 at one locality (studenka, 49 degrees 44', 18 degrees 05'). host samples included yellow-necke ... | 2003 | 14677912 |
| on the causative agent of tsutsugamushi disease isolated from field voles, apodemus speciosus speciosus, inhabiting the foot area of mt. fuji in japan. | 1951 | 14825608 | |
| optimal body size and energy expenditure during winter: why are voles smaller in declining populations? | winter is energetically challenging for small herbivores because of greater energy requirements for thermogenesis at a time when little energy is available. we formulated a model predicting optimal wintering body size, accounting for the scaling of both energy expenditure and assimilation to body size, and the trade-off between survival benefits of a large size and avoiding survival costs of foraging. the model predicts that if the energy cost of maintaining a given body mass differs between env ... | 2004 | 15026979 |
| a striated muscle on the hard palate of rodents and rabbits. | summary a striated muscle of the hard palate has been previously described in some rodents and rabbits. it is not termed in the official veterinary anatomical nomenclature. the aim of this work was to verify the existence of this muscle. heads of the golden hamster (mesocricetus auratus), the guinea pig (cavia aperea f. porcellus), the laboratory rat (rattus norvegicus var. alba), the field vole (microtus agrestis) and the domestic rabbit (oryctolagus cuniculus f. domesticus) have been dissected ... | 2004 | 15027950 |
| polychlorinated biphenyls in small mammals from contaminated landfill sites. | pcbs in small mammals living in a contaminated landfill site varied in both concentration and congener composition, reflecting both the feeding strategy of each species and the chlorination of the congeners. body concentrations of sigmapcb on a 1:1:1 arochlor (1242:1254:1260) basis gave a rank order of sorex araneus > apodemus sylvaticus > microtus agrestis. comparisons with data for other pcb-contaminated sites suggest that the sigmapcb values in s. araneus from the landfill site may be of suff ... | 1996 | 15091398 |
| predicting cadmium, lead and fluoride levels in small mammals from soil residues and by species-species extrapolation. | the effects of heavy metals on wild mammals are often assessed by analysing residues in body organs. this paper reviews published studies to determine whether cadmium (cd), lead (pb) and fluoride (f) residues in small mammals can be predicted directly from residues in soil or, when this is not possible, from residues in other species. it was found that residues in soil could be used to predict cd and pb concentrations in small mammals. there were significant (p < 0.05) relationships between cd r ... | 1995 | 15091546 |
| fluoride accumulation and toxicity in wild small mammals. | populations of two species of small mammal, the field vole (microtus agrestis l.) and the bank vole (clethrionomys glareolus l.), inhabiting grasslands contaminated by industrial sources of fluoride were examined for fluoride concentrations in skeletal tissue and for morphological changes in the teeth. concentrations of fluoride in teeth and bones were higher for c. glareolus than for m. agrestis at the chemical works and smelter sites. severe dental lesions were recorded on the incisor and mola ... | 1994 | 15091672 |
| distribution of trace element pollutants in a contaminated ecosystem established on metalliferous fluorspar tailings. 3: fluoride. | high total soil fluoride (10 000 microg g(-1)) in the metalliferous fluorspar tailings was reflected by elevated concentrations in standing live vegetation (300-1000 microg g(-1)); plant roots (c. 6000 microg g(-1)); plant litter (c. 4000 microg g(-1)); total body concentrations of invertebrates (400-4000 microg g(-1)) and the small mammals microtus agrestis (120-360 microg g(-1)) and sorex araneus (140-250 microg g(-1)). seasonal changes in the standing live vegetation and the availability of s ... | 1989 | 15092395 |
| distribution of trace element pollutants in a contaminated grassland ecosystem established on metalliferous fluorspar tailings. 2: zinc. | concentrations of zinc in vegetation, invertebrates and small mammals in a grassland ecosystem derived from a mine waste vegetation scheme indicated the high concentration of zinc in the original tailings. however, the considerable differences in soil and vegetation zinc concentrations between the tailings and an uncontaminated site were not reflected in the invertebrate and small mammal communities. invertebrate zinc levels and total body concentrations in microtus agrestis l. (field vole) and ... | 1989 | 15092405 |
| distribution of trace element pollutants in a contaminated grassland ecosystem established on metalliferous fluorspar tailings. 1: lead. | concentrations of lead in vegetation, invertebrates and small mammals in a grassland ecosystem evolved from a mine waste revegetation scheme indicated the high concentration of lead in the original tailings. lead levels in invertebrates reflected dietary concentrations and feeding strategy, a pattern also true of the indigenous small mammals. total body and tissue concentrations of lead in the herbivorous microtus agrestis l. (field vole) and insectivorous sorex araneus l. (common shrew) were si ... | 1989 | 15092440 |
| fluoride in the prey of barn owls (tyto alba). | bone fluoride in short-tailed voles (microtus agrestis) and common shrews (sorex araneus), the prey of barn owls (tyto alba), was studied on anglesey, north wales. the average fluoride content of m. agrestis skulls obtained from a location 0.9 km from an aluminium reduction plant was significantly greater than that of skulls from another location 22 km from the source of industrial fluoride pollution. at both locations, mean fluoride levels of skulls extracted from owl pellets and those of voles ... | 1987 | 15092770 |
| disease dynamics in cyclic populations of field voles (microtus agrestis): cowpox virus and vole tuberculosis (mycobacterium microti). | the possible role of pathogens in rodent population cycles has been largely neglected since elton's 'epidemic hypothesis' of 1931. to revisit this question, 12 adjacent, cyclic but out-of-phase populations of field voles (microtus agrestis) in north east england were studied and the initial results are presented here. the prevalences of antibodies to cowpox virus and of clinical signs of mycobacterium microti infection (vole tuberculosis) showed delayed (not direct) density dependence (with a la ... | 2004 | 15255106 |
| sex-biased maternal investment in voles: importance of environmental conditions. | adaptive bias in sex allocation is traditionally proposed to be related to the condition of mothers as well as to the unequal fitness values of produced sexes. a positive relationship between mother condition and investment into male offspring is often predicted. this relationship was also recently found to depend on environmental conditions. we studied these causalities experimentally using a design where winter food supply was manipulated in eight outdoor-enclosed populations of field voles mi ... | 2004 | 15306337 |
| apoptosis distribution in the first molar tooth germ of the field vole (microtus agrestis). | apoptosis represents an important process in organ and tissue morphogenesis and remodeling during embryonic development. a role for apoptosis in shape formation of developing teeth has been suggested. the field vole is a useful model for comparative studies in odontogenesis, particularly because of its contrasting molar morphogenesis when compared to the mouse. however, little is known concerning apoptosis in tooth development of this species. morphological (cellular and nuclear alterations) and ... | 2004 | 15385152 |
| identification of bartonella species in rodents, shrews and cats in denmark: detection of two b. henselae variants, one in cats and the other in the long-tailed field mouse. | small mammals and stray cats were trapped in two areas of north zealand, denmark, and their blood cultured for hemotrophic bacteria. bacterial isolates were recovered in pure culture and subjected to 16s rdna gene sequencing. bartonella species were isolated from five mammalian species: b. grahamii from microtus agrestis (field vole) and apodemus flavicollis (yellow-necked field mouse); b. taylorii from m. agrestis, a. flavicollis and a. sylvaticus (long-tailed field mouse); b. tribocorum from a ... | 2004 | 15511270 |
| effect of photoperiod on body mass, food intake and body composition in the field vole, microtus agrestis. | many small mammals respond to seasonal changes in photoperiod by altering body mass and adiposity. these animals may provide valuable models for understanding the regulation of energy balance. here, we present data on the field vole (microtus agrestis) - a previously uncharacterised example of photoperiod-induced changes in body mass. we examined the effect of increased day length on body mass, food intake, apparent digestive efficiency, body composition, de novo lipogenesis and fatty acid compo ... | 2005 | 15671345 |
| predator-induced synchrony in population oscillations of coexisting small mammal species. | comprehensive analyses of long-term (1977-2003) small-mammal abundance data from western finland showed that populations of microtus voles (field voles m. agrestis and sibling voles m. rossiaemeridionalis) voles, bank (clethrionomys glareolus) and common shrews (sorex araneus) fluctuated synchronously in 3 year population cycles. time-series analyses indicated that interspecific synchrony is influenced strongly by density-dependent processes. synchrony among microtus and bank voles appeared addi ... | 2005 | 15695211 |
| apoptosis-related factors (fas receptor, fas ligand, fadd) in early tooth development of the field vole (microtus agrestis). | fas (cd95/apo-1) belongs to the tnf receptor (tnfr) family. fas ligand binding followed by fas-receptor oligomerisation leads to formation of a death-inducing signal complex starting with recruitment of the fas-adapter protein (fadd). components of this initiation complex (fas, fas-l, fadd) were correlated with apoptotic cells, detected by specific dna fragmentation and morphological criteria. apoptotic cells can be detected throughout the embryonic development of molar teeth. restricted temporo ... | 2005 | 15721145 |
| sheep grazing and rodent populations: evidence of negative interactions from a landscape scale experiment. | inter-specific competition, facilitation and predation influence herbivore assemblages, but no study has experimentally explored the interactions between large ungulates and small rodents. in a fully replicated, landscape scale experiment, we manipulated densities of domestic sheep in mountain pastures in norway. we then determined population growth and densities of rodents by live trapping in each of the areas with different sheep densities. we found that the (summer) population growth rate and ... | 2005 | 15726430 |
| origin and developmental fate of vestigial tooth primordia in the upper diastema of the field vole (microtus agrestis, rodentia). | odontogenesis in voles is a convenient model to test hypotheses on tooth development generated from investigations in the mouse. similar to other rodents, the functional dentition of the vole includes a toothless diastema. at its mesial end, a vestigial tooth bud has been found in the upper jaw of vole embryos. the aim of this study was to analyse the developmental dynamics of vestigial tooth structures in the upper diastema of the field vole and to compare it with the situation in the mouse. | 2004 | 15748693 |
| 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 ... | 2004 | 15787199 |
| caspase 3 activation in the primary enamel knot of developing molar tooth. | mammalian teeth develop during embryogenesis as epithelio-mesenchymal organs. the primary enamel knot is considered as a signaling center in tooth morphogenesis. after tooth bell formation, this epithelial structure undergoes apoptosis. activation of caspase 3 represents a crucial step in the intracellular death machinery. procaspase 3 and caspase 3 molecules were localized in the primary enamel knot of the field vole using immunohistochemistry. different fixation procedures in cryopreserved and ... | 2006 | 15910164 |
| analysis of sex-linked sequences supports a new mammal species in europe. | european mammals have been the focus of particularly detailed taxonomic studies by traditional morphological methods. however, dna analyses have the potential to reveal additional, cryptic species. we describe two highly divergent evolutionary lineages within a small eurasian mammal, the field vole (microtus agrestis). we show that the two lineages can be detected not only with maternally (mitochondrial dna), but also with paternally (y chromosome) and biparentally (x chromosome) inherited dna s ... | 2005 | 15910324 |
| comparison of different approaches for the calculation of energy expenditure using doubly labeled water in a small mammal. | the doubly labeled water (dlw) method is an isotope-based technique for the estimation of the co(2) production, and hence energy expenditure, of free-living animals and humans. several methods are available for the calculation of co(2) production from the isotope fluxes, depending on different assumptions about the behavior of isotopes during the elimination process. we used the dlw method to estimate the daily energy expenditures (dee) of 55 field voles (microtus agrestis) held in a captive fac ... | 2013 | 15957119 |
| relationship between vestibular lamina, dental lamina, and the developing oral vestibule in the upper jaw of the field vole (microtus agrestis, rodentia). | formation of the oral vestibule is ignored in most studies on tooth development, although dental and vestibular lamina are closely related to each other. knowledge about morphogenetic processes shaping the oral vestibule is missing almost completely. the aim of this study was to assess the developmental relationship between dental and vestibular lamina as well as formation of the oral vestibule in the upper jaw of the field vole (microtus agrestis), a small rodent representing an attractive mode ... | 2005 | 16025539 |
| trypanosomes, fleas and field voles: ecological dynamics of a host-vector--parasite interaction. | to investigate the prevalence of a flea-borne protozoan (trypanosoma (herpetosoma) microti) in its field vole (microtus agrestis) host, we monitored over a 2-year period a range of intrinsic and extrinsic parameters pertaining to host demographics, infection status and vector (flea) prevalence. generalized linear mixed modelling was used to analyse patterns of both flea and trypanosome occurrence. overall, males of all sizes and ages were more likely to be infested with fleas than their female c ... | 2005 | 16178357 |
| whole-genome chromosome distribution during nuclear fragmentation of giant trophoblast cells of microtus rossiaemeridionalis studied with the use of gonosomal chromatin arrangement. | gonosomal chromatin bodies (gcbs), i.e. blocks of condensed chromatin consisting of heterochromatized region of the sex chromosomes of the field vole m. rossiaemeridionalis, were used as a natural interphase chromosome marker in order to clarify the regularities of gcb rearrangement during nuclear fragmentation of secondary giant trophoblast cells (sgtcs) at the end of their differentiation. cytophotometrical measurements of dna content in the nuclei, nuclear fragments and simultaneously in the ... | 2005 | 16314124 |
| photoperiod regulates leptin sensitivity in field voles, microtus agrestis. | we have previously shown that cold-acclimated (8 degrees c) male field voles (microtus agrestis) transferred from short (sd, 8:16 h l:d) to long photoperiod (ld, 16:8 h l:d) exhibit increases in body mass, adiposity and food intake. to assess whether these increases were associated with decreased leptin sensitivity, we infused ld and sd voles with physiological doses of murine leptin (or saline) delivered peripherally for 7 days via mini-osmotic pumps. measurements were made of body mass (weight ... | 2006 | 16402185 |
| bovine tuberculosis infection in wild mammals in the south-west region of england: a survey of prevalence and a semi-quantitative assessment of the relative risks to cattle. | in the united kingdom, badgers are implicated in the transmission of mycobacterium bovis to cattle, but little information is available on the potential role of other wild mammals. this paper presents the results of the largest systematic uk survey of m. bovis infection in other wild mammals. mammal carcasses (4715) from throughout the south-west region of england were subjected to a systematic post mortem examination, microbiological culture of tissues and spoligotyping of isolates. infection w ... | 2007 | 16434219 |
| toxoplasmosis: a serological survey in ontario wildlife. | sera from seven species of wild animals in ontario were examined for antibody to toxoplasma gondii using the sabin-feldman dye test. of 158 sera tested, 53% of the red foxes (vulpes vulpes), 56% of the striped skunks (mephitis mephitis), 78% of the coyotes (canis latrans), 33% of the black bears (ursus americanus), 18% of the short tailed shrews (blarina brevicauda) and none of the field voles (microtus pennsylvanicus) had antibody. antibody to t. gondii was present in sera from wild animals cap ... | 1976 | 16502687 |
| proliferation and apoptosis in early molar morphogenesis-- voles as models in odontogenesis. | proliferation and apoptosis play crucial roles in the development of multicellular organisms. their precise balance is necessary for tissue homeostasis throughout life. the developing dentition is a suitable model to study proliferation and apoptosis during embryogenesis, but the corresponding studies have been carried out principally in the mouse. the present study aimed to examine proliferation and apoptosis in the vole (microtus sp., rodentia) during the early morphogenesis of the first upper ... | 2006 | 16586349 |
| vole population cycles in northern and southern europe: is there a need for different explanations for single pattern? | 1. students of population cycles in small rodents in fennoscandia have accumulated support for the predation hypothesis, which states that the gradient in cycle length and amplitude running from southern to northern fennoscandia reflects the relative influence of specialist and generalist predators on vole dynamics, itself modulated by the presence of snow cover. the hypothesized role of snow cover is to isolate linked specialist predators, primarily the least weasel, mustela n. nivalis l. and t ... | 2006 | 16637987 |
| changes over time in the spatiotemporal dynamics of cyclic populations of field voles (microtus agrestis l.). | we demonstrate changes over time in the spatial and temporal dynamics of an herbivorous small rodent by analyzing time series of population densities obtained at 21 locations on clear cuts within a coniferous forest in britain from 1984 to 2004. changes had taken place in the amplitude, periodicity, and synchrony of cycles and density-dependent feedback on population growth rates. evidence for the presence of a unidirectional traveling wave in rodent abundance was strong near the beginning of th ... | 2006 | 16671000 |
| delayed density-dependent season length alone can lead to rodent population cycles. | studies of cyclic microtine populations (voles and lemmings) have suggested a relationship between the previous year's population density and the subsequent timing of the onset of reproduction by overwintered breeding females. no studies have explored the importance of this relationship in the generation of population cycles. here we mathematically examine the implications of variation in reproductive season length caused by delayed density-dependent changes in its start date. we demonstrate tha ... | 2006 | 16671013 |
| [a study of dna depolyploidization and depolytenization of the heterochromatized gonosomal chromatin bodies in the secondary giant trophoblast cells of the field vole microtus rossiaemeridionalis using cytophotometry]. | a study was made of the distribution of the heterochromatized gonosomal chromatin bodies (gcb) material in the course of nuclear fragmentation of secondary giant trophoblast cells resulting in polykaryocyte formation at the late stage of their differentiation. a simultaneous dna cytophotometry in gcbs and nuclear fragments showed a progressive gcb dna content decrease proportional to that of dna content in nuclear fragments. dna contents in the nuclear fragments corresponded to 2c, 4c and 8c. in ... | 2005 | 16711385 |
| [anoplura of rodents (rodentia) in northern poland]. | anoplura of rodents (rodentia) in northern poland. above 100 rodents belonging to 6 species (clethrionomys glareolus, microtus agrestis, m. arvalis, apodemus flavicollis, a. sylvaticus, mus musculus) caught in the various habitations were examined. the parasites found represented three species of anoplura: hoplopleura acanthopus, h. affinis and polyplax serrata. h. acanthopus appeard to be the most common parasite; it was found in all examined hosts, while mostly on the bank vole. | 2004 | 16859044 |
| diabetes and myocarditis in voles and lemmings at cyclic peak densities--induced by ljungan virus? | although it is well-documented from theoretical studies that pathogens have the capacity to generate cycles, the occurrence and role of pathogens and disease have been poorly empirically studied in cyclic voles and lemmings. in screening for the occurrence of disease in cyclic vole and lemming populations, we found that a high proportion of live-trapped clethrionomys glareolus, c. rufocanus, microtus agrestis and lemmus lemmus at high collective peak density, shortly before the decline, suffered ... | 2006 | 16868760 |
| a role for vector-independent transmission in rodent trypanosome infection? | within host-pathogen systems where vector-borne transmission is the primary route of infection, little or no attention has been paid to the relative importance of secondary or alternative routes of transmission. here, by contrast, we report the results from a controlled longitudinal field-scale experiment in which the prevalence of fleas (siphonaptera) was manipulated and the occurrence and distribution of a flea-borne protozoan (trypanosoma (herpetosoma) microti) in a natural field vole (microt ... | 2006 | 16876803 |
| experimental demonstration of the antiherbivore effects of silica in grasses: impacts on foliage digestibility and vole growth rates. | the impact of plant-based factors on the population dynamics of mammalian herbivores has been the subject of much debate in ecology, but the role of antiherbivore defences in grasses has received relatively little attention. silica has been proposed as the primary defence in grasses and is thought to lead to increased abrasiveness of foliage so deterring feeding, as well as reducing foliage digestibility and herbivore performance. however, at present there is little direct experimental evidence ... | 2006 | 16928631 |
| artificial reproduction of the yangtze field vole: in vitro embryo development and fertilization with fresh and freeze-thawed sperm. | several research groups are using the yangtze field vole as a model for studying schistosome infection, but relatively little is known about the species's reproductive physiology. the authors examined the vole's in vivo and in vitro embryonic development as well as the efficacy of in vitro fertilization using either fresh or cryopreserved sperm to breed these rodents. | 2006 | 16943792 |
| intraspecific competition, growth, chemistry, and susceptibility to voles in seedlings of betula pendula. | we studied the effects of the intensity of intraspecific competition, as indicated by seedling density, and competitive success within populations, as indicated by seedling size, on the secondary chemistry of the stems of silver birch seedlings and their palatability to field voles. we found that the size of seedlings and their total phenolic concentrations were inversely related to stand density. voles, however, did not discriminate between seedlings grown at the densities studied. variation in ... | 2006 | 17001532 |
| incomplete sister chromatid separation of long chromosome arms. | chromosome segregation ensures the equal partitioning of chromosomes at mitosis. however, long chromosome arms may pose a problem for complete sister chromatid separation. in this paper we report on the analysis of cell division in primary cells from field vole microtus agrestis, a species with 52 chromosomes including two giant sex chromosomes. dual chromosome painting with probes specific for the x and the y chromosomes showed that these long chromosomes are prone to mis-segregate, producing d ... | 2006 | 17021850 |
| cowpox virus infection in natural field vole microtus agrestis populations: delayed density dependence and individual risk. | 1. little is known about the dynamics of pathogen (microparasite) infection in wildlife populations, and less still about sources of variation in the risk of infection. here we present the first detailed analysis of such variation. 2. cowpox virus is an endemic sublethal pathogen circulating in populations of wild rodents. cowpox prevalence was monitored longitudinally for 2 years, in populations of field voles exhibiting multiannual cycles of density in kielder forest, uk. 3. the probability th ... | 2006 | 17032374 |
| contrasting dynamics of bartonella spp. in cyclic field vole populations: the impact of vector and host dynamics. | many zoonotic disease agents are transmitted between hosts by arthropod vectors, including fleas, but few empirical studies of host-vector-microparasite dynamics have investigated the relative importance of hosts and vectors. this study investigates the dynamics of 4 closely related bartonella species and their flea vectors in cyclic populations of field voles (microtus agrestis) over 3 years. the probability of flea infestation was positively related to field vole density 12 months previously i ... | 2007 | 17096870 |
| costs of coexistence along a gradient of competitor densities: an experiment with arvicoline rodents. | 1. costs of coexistence for species with indirect resource competition usually increase monotonically with competitor numbers. very little is known though about the shape of the cost function for species with direct interference competition. 2. here we report the results of an experiment with two vole species in artificial coexistence in large enclosures, where density of the dominant competitor species (microtus agrestis) was manipulated. experimental populations of the subordinate vole species ... | 2007 | 17184354 |
| sympatric ixodes trianguliceps and ixodes ricinus ticks feeding on field voles (microtus agrestis): potential for increased risk of anaplasma phagocytophilum in the united kingdom? | the importance of wild rodents as reservoirs of zoonotic tick-borne pathogens is considered low in the united kingdom because, in studies to date, those parasitized by exophilic ixodes ricinus ticks carry almost exclusively larvae and thus have a minor role in transmission cycles. in a cross-sectional study, 11 (6.7%) of 163 field voles (microtus agrestis) captured at field sites in northern england were pcr-positive for anaplasma phagocytophilum. the voles were found to act as hosts for both la ... | 2006 | 17187576 |
| ultradian rhythms and the nutritional importance of caecotrophy in captive brandt's voles (lasiopodomys brandtii). | ingestion of soft faeces derived from caecal contents, caecotrophy, in herbivorous small mammals is considered an adaptation to the metabolic disadvantage of small body size, especially when feeding on diets of low quality. we investigated daily activity patterns in captive brandt's voles (lasiopodomys brandtii), including feeding, locomotion, caecotrophy, and defaecation, by continuous 24 h visual observation; and estimated the contribution of soft faeces ingestion (caecotrophy) to intake of pr ... | 2007 | 17211665 |
| altered expression of socs3 in the hypothalamic arcuate nucleus during seasonal body mass changes in the field vole, microtus agrestis. | we have previously shown that cold-acclimated (8 degrees c) male field voles (microtus agrestis) transferred from short day (sd, 8 h light) to long day (ld, 16 h light) photoperiod exhibit an increase in body mass lasting 4 weeks, after which they stabilise at a new plateau approximately 7.5 g (24.8%) higher than animals maintained in sd. by infusing voles with exogenous leptin, we have also demonstrated that sd voles respond to the hormone by reducing body mass and food intake, whereas ld anima ... | 2007 | 17214870 |
| regulation of body mass and adiposity in the field vole, microtus agrestis: a model of leptin resistance. | adult mammals are typically highly resistant to perturbations in their energy balance. in obese humans, however, this control appears to be lost. apart from a few exceptional cases, this loss of control occurs despite appropriate levels of circulating leptin -- suggesting that elevated adiposity may be a consequence of failure to respond to the leptin signal: leptin resistance. when cold-acclimated male field voles (microtus agrestis) are transferred from short (sd, 8 h light) to long (ld, 16 h ... | 2007 | 17283227 |
| dioxin exposure in contaminated sawmill area: the use of molar teeth and bone of bank vole (clethrionomys glareolus) and field vole (microtus agrestis) as biomarkers. | developmental disorders of teeth are among the most sensitive targets of polychlorinated dibenzo-p-dioxin and -furan (pcdd/f) exposure. in rats, 2,3,7,8-tetrachlorodibenzo-p-dioxin (tcdd) reduces dose-dependently the size of molars, most severely the third lower molars. dioxins also have effects on developing bone, including altered bone mineral density as well as reduced bending breaking force and stiffness. the aim of this study was to evaluate the use of the third lower molar and long bones a ... | 2007 | 17335869 |
| 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 ... | 2007 | 17497247 |
| chromosomal evolution of arvicolinae (cricetidae, rodentia). ii. the genome homology of two mole voles (genus ellobius), the field vole and golden hamster revealed by comparative chromosome painting. | using cross-species chromosome painting, we have carried out a comprehensive comparison of the karyotypes of two ellobius species with unusual sex determination systems: the transcaucasian mole vole, ellobius lutescens (2n = 17, x in both sexes), and the northern mole vole, ellobius talpinus (2n = 54, xx in both sexes). both ellobius species have highly rearranged karyotypes. the chromosomal paints from the field vole (microtus agrestis) detected, in total, 34 and 32 homologous autosomal regions ... | 2007 | 17924201 |
| disease effects on reproduction can cause population cycles in seasonal environments. | 1. recent studies of rodent populations have demonstrated that certain parasites can cause juveniles to delay maturation until the next reproductive season. furthermore, a variety of parasites may share the same host, and evidence is beginning to accumulate showing nonindependent effects of different infections. 2. we investigated the consequences for host population dynamics of a disease-induced period of no reproduction, and a chronic reduction in fecundity following recovery from infection (s ... | 2008 | 18005128 |
| tuberculosis (mycobacterium microti) in wild field vole populations. | vole tuberculosis (tb; mycobacterium microti) is an understudied endemic infection. despite progressing slowly, it causes severe clinical pathology and overt symptoms in its rodent host. tb was monitored for 2 years in wild field voles in kielder forest, uk. the prevalence of characteristic cutaneous tb lesions was monitored longitudinally at 4 sites, with individuals live-trapped and repeatedly monitored. a prevalence of 5.2% of individuals with lesions was recorded (n=2791). in a cross-section ... | 2008 | 18005472 |
| sensitivity to assumptions in models of generalist predation on a cyclic prey. | ecological theory predicts that generalist predators should damp or suppress long-term periodic fluctuations (cycles) in their prey populations and depress their average densities. however, the magnitude of these impacts is likely to vary depending on the availability of alternative prey species and the nature of ecological mechanisms driving the prey cycles. these multispecies effects can be modeled explicitly if parameterized functions relating prey consumption to prey abundance, and realistic ... | 2007 | 18027760 |
| cowpox virus infection in natural field vole microtus agrestis populations: significant negative impacts on survival. | 1. cowpox virus is an endemic virus circulating in populations of wild rodents. it has been implicated as a potential cause of population cycles in field voles microtus agrestis l., in britain, owing to a delayed density-dependent pattern in prevalence, but its impact on field vole demographic parameters is unknown. this study tests the hypothesis that wild field voles infected with cowpox virus have a lower probability of survival than uninfected individuals. 2. the effect of cowpox virus infec ... | 2008 | 18177331 |
| consumption of grass endophytes alters the ultraviolet spectrum of vole urine. | fungal endophytes of grasses are known to benefit their hosts directly by increasing resistance to herbivores through mycotoxins. we propose and test assumptions of a novel hypothesis according to which fungal endophytes of grasses may benefit their hosts also indirectly by increasing the conspicuousness of a mammalian herbivore, the field vole (microtus agrestis), to its avian predators by enhancing the ultraviolet visibility of vole urine. we found that field voles feeding on endophyte-infecte ... | 2008 | 18274778 |
| prevalence of toxoplasma gondii in small mammals from the ardennes region, france. | serum samples from 218 small mammals trapped in forest and grassland in the ardennes region (north-eastern france) were tested for antibodies to toxoplasma gondii. using the modified agglutination test, positive results were found in 4/92 apodemus sp., 3/64 clethrionomys glareolus, 0/26 microtus agrestis, 0/4 micromys minutus, 3/5 sorex sp., 2/9 arvicola terrestris, and 7/18 talpa europaea. toxoplasma gondii was not isolated from the heart of seropositive individuals after bioassay in mice. sero ... | 2007 | 18303774 |
| a new whipworm from arvicolid rodents, trichuris arvicolae feliu et al., 2000, in the helminth fauna of poland. | during the parasitological examination of wild rodents from the vicinity of wrocław a single whipworm female was isolated from a field vole microtus agrestis. the nematode was determined as trichuris arvicolae. this is the first report of this parasite in poland. | 2007 | 18441882 |
| poor condition and infection: a vicious circle in natural populations. | pathogens may be important for host population dynamics, as they can be a proximate cause of morbidity and mortality. infection dynamics, in turn, may be dependent on the underlying condition of hosts. there is a clear potential for synergy between infection and condition: poor condition predisposes to host infections, which further reduce condition and so on. to provide empirical data that support this notion, we measured haematological indicators of infection (neutrophils and monocytes) and co ... | 2008 | 18448414 |
| the impact of experimentally elevated energy expenditure on oxidative stress and lifespan in the short-tailed field vole microtus agrestis. | life-history theory assumes that animal life histories are a consequence of trade-offs between current activities and future reproductive performance or survival, because resource supply is limited. empirical evidence for such trade-offs in the wild are common, yet investigations of the underlying mechanisms are rare. life-history trade-offs may have both physiological and ecological mediated costs. one hypothesized physiological mechanism is that elevated energy metabolism may increase reactive ... | 2008 | 18467297 |
| parasite interactions in natural populations: insights from longitudinal data. | the physiological and immunological state of an animal can be influenced by current infections and infection history. consequently, both ongoing and previous infections can affect host susceptibility to another parasite, the biology of the subsequent infection (e.g. infection length) and the impact of infection on host morbidity (pathology). in natural populations, most animals will be infected by a succession of different parasites throughout the course of their lives, with probably frequent co ... | 2008 | 18474121 |
| are silica defences in grasses driving vole population cycles? | understanding the factors that drive species population dynamics is fundamental to biology. cyclic populations of microtine rodents have been the most intensively studied to date, yet there remains great uncertainty over the mechanisms determining the dynamics of most of these populations. for one such population, we present preliminary evidence for a novel mechanism by which herbivore-induced reductions in plant quality alter herbivore life-history parameters and subsequent population growth. w ... | 2008 | 18482904 |
| the dynamics of health in wild field vole populations: a haematological perspective. | 1. pathogens have been proposed as potentially important drivers of population dynamics, but while a few studies have investigated the impact of specific pathogens, the wealth of information provided by general indices of health has hardly been exploited. by evaluating haematological parameters in wild populations, our knowledge of the dynamics of health and infection may be better understood. 2. here, haematological dynamics in natural populations of field voles are investigated to determine en ... | 2008 | 18564292 |
| voles on small islands: effects of food limitation and alien predation. | ecosystems of three trophic levels may be bottom-up (by food-plant availability) and/or top-down (by predators) limited. top-down control might be of greater consequence when the predation impact comes from an alien predator. we conducted a replicated two-factor experiment with field voles (microtus agrestis) during 2004-2005 on small islands of the outer archipelago of the baltic sea, south-west finland, manipulating both predation impact by introduced american mink (mustela vison) and winter f ... | 2008 | 18607635 |
| prion protein amino acid determinants of differential susceptibility and molecular feature of prion strains in mice and voles. | the bank vole is a rodent susceptible to different prion strains from humans and various animal species. we analyzed the transmission features of different prions in a panel of seven rodent species which showed various degrees of phylogenetic affinity and specific prion protein (prp) sequence divergences in order to investigate the basis of vole susceptibility in comparison to other rodent models. at first, we found a differential susceptibility of bank and field voles compared to c57bl/6 and wo ... | 2008 | 18654630 |
| azurocytes in wild field voles: factors associated with their occurrence. | the occurrence of azurocytes (az), a type of leukocyte unique to voles and previously described for three microtus species, is now reported in microtus agrestis. the goal of this study was to shed new light on the possible function and significance of these cells and on how they play a role in the natural history of rodent species. individuals from three vole populations were sampled monthly for 2 years. a hemogram was produced for each individual, and az counts estimated. the counts of az were ... | 2008 | 18704584 |
| relative importance of ixodes ricinus and ixodes trianguliceps as vectors for anaplasma phagocytophilum and babesia microti in field vole (microtus agrestis) populations. | the importance of ixodes ricinus in the transmission of tick-borne pathogens is well recognized in the united kingdom and across europe. however, the role of coexisting ixodes species, such as the widely distributed species ixodes trianguliceps, as alternative vectors for these pathogens has received little attention. this study aimed to assess the relative importance of i. ricinus and i. trianguliceps in the transmission of anaplasma phagocytophilum and babesia microti among united kingdom fiel ... | 2008 | 18820068 |
| host condition and individual risk of cowpox virus infection in natural animal populations: cause or effect? | recent studies have provided evidence that endemic pathogens may affect dynamics in animals. however, such studies have not typically considered that infected individuals might have a preceding underlying poor condition. we examined whether individuals in poor condition are more likely to become infected by an endemic pathogen, using as a system the dynamics of cowpox virus in field voles. with data from monthly sampled vole populations, a nested case-control study evaluated whether susceptible ... | 2009 | 19144246 |
| seasonal host dynamics drive the timing of recurrent epidemics in a wildlife population. | the seasonality of recurrent epidemics has been largely neglected, especially where patterns are not driven by forces external to the population. here, we use data on cowpox virus in field voles to explore the seasonal patterns in wildlife (variable abundance) populations and compare these with patterns previously found in humans. timing in our system was associated with both the number and the rate of recruitment of susceptible hosts. a plentiful and sustained supply of susceptible hosts throug ... | 2009 | 19203924 |
| endopolyploidization and the interstitial invasion of the supergiant trophoblast cells of the field vole microtus rossiaemeridionalis. | the supergiant trophoblast cells characteristic of vole placenta prove to be highly invasive being found at the boundary of the decidualized endometrium and myometrium. their size (100 microm and higher) suggests them to be highly polyploid, though their ploidy was not determined by now. we performed determination of the ploidy level of the supergiant trophoblast cells (sugt) in order to verify whether the highly polyploid trophoblast cells are capable of deep intrauterine invasion. anti-cytoker ... | 2009 | 19329135 |
| predation and fragmentation portrayed in the statistical structure of prey time series. | statistical autoregressive analyses of direct and delayed density dependence are widespread in ecological research. the models suggest that changes in ecological factors affecting density dependence, like predation and landscape heterogeneity are directly portrayed in the first and second order autoregressive parameters, and the models are therefore used to decipher complex biological patterns. however, independent tests of model predictions are complicated by the inherent variability of natural ... | 2009 | 19419539 |
| patterns of orthopox virus wild rodent hosts in south germany. | although cowpox virus (cpxv) infections in a variety of dead-end hosts have been investigated in germany for more than 50 years, data on species and geographical distribution of cpxv in reservoir hosts are sparse. here we present the first comprehensive study of 825 rodents that have been collected in bavaria, southern germany. in summary, six different rodent species (apodemus flavicollis, myodes glareolus, microtus arvalis, apodemus sylvaticus, microtus agrestis, and arvicola amphibius) were t ... | 2009 | 19492947 |
| mycobacterium microti: more diverse than previously thought. | mycobacterium microti is a member of the mycobacterium tuberculosis complex of bacteria. this species was originally identified as a pathogen of small rodents and shrews and was associated with limited diversity and a much reduced spoligotype pattern. more recently, specific deletions of chromosomal dna have been shown to define this group of organisms, which can be identified by the absence of chromosomal region rd1(mic). we describe here the molecular characteristics of 141 strains of the myco ... | 2009 | 19535520 |
| the effects of spatial and temporal heterogeneity on the population dynamics of four animal species in a danish landscape. | variation in carrying capacity and population return rates is generally ignored in traditional studies of population dynamics. variation is hard to study in the field because of difficulties controlling the environment in order to obtain statistical replicates, and because of the scale and expense of experimenting on populations. there may also be ethical issues. to circumvent these problems we used detailed simulations of the simultaneous behaviours of interacting animals in an accurate facsimi ... | 2009 | 19549327 |
| physiological models of leptin resistance. | in common forms of obesity, animals and humans become leptin resistant associated with impaired regulation of energy homeostasis. over the last decade, significant advances in delineating the underlying mechanisms have been achieved. as well as the obvious scientific progress obtained by novel transgenic animals, natural and physiological models of leptin resistance such as the siberian hamster (phodoups sungorus), the field vole (microtus agrestis) or the rat during pregnancy have also provided ... | 2009 | 19732287 |
| the celtic fringe of britain: insights from small mammal phylogeography. | recent genetic studies have challenged the traditional view that the ancestors of british celtic people spread from central europe during the iron age and have suggested a much earlier origin for them as part of the human recolonization of britain at the end of the last glaciation. here we propose that small mammals provide an analogue to help resolve this controversy. previous studies have shown that common shrews (sorex araneus) with particular chromosomal characteristics and water voles (arvi ... | 2009 | 19793757 |
| extensive host sharing of central european tula virus. | to examine the host association of tula virus (tulv), a hantavirus present in large parts of europe, we investigated a total of 791 rodents representing 469 microtus arvalis and 322 microtus agrestis animals from northeast, northwest, and southeast germany, including geographical regions with sympatric occurrence of both vole species, for the presence of tulv infections. based on serological investigation, reverse transcriptase pcr, and subsequent sequence analysis of partial small (s) and mediu ... | 2010 | 19889769 |
| individual growth rates in natural field vole, microtus agrestis, populations exhibiting cyclic population dynamics. | rodents that have multi-annual cycles of density are known to have flexible growth strategies, and the "chitty effect", whereby adults in the high-density phase of the cycle exhibit larger average body mass than during the low phase, is a well-documented feature of cyclic populations. despite this, there have been no studies that have repeatedly monitored individual vole growth over time from all phases of a density cycle, in order to evaluate whether such variation in body size is due to differ ... | 2010 | 19916066 |
| characterization of a novel wood mouse virus related to murid herpesvirus 4. | two novel gammaherpesviruses were isolated, one from a field vole (microtus agrestis) and the other from wood mice (apodemus sylvaticus). the genome of the latter, designated wood mouse herpesvirus (wmhv), was completely sequenced. wmhv had the same genome structure and predicted gene content as murid herpesvirus 4 (muhv4; murine gammaherpesvirus 68). overall nucleotide sequence identity between wmhv and muhv4 was 85 % and most of the 10 kb region at the left end of the unique region was particu ... | 2010 | 19940063 |
| maternal corticosterone but not testosterone level is associated with the ratio of second-to-fourth digit length (2d:4d) in field vole offspring (microtus agrestis). | the steroid environment encountered by a foetus can strongly affect its post-natal physiology and behaviour. it has been proposed that steroid concentrations experienced in utero could be estimated from adults by measuring their second-to-fourth digit length ratio (2d:4d). however, there is still little direct evidence that intra-uterine steroid levels affect individual 2d:4d. we examined whether maternal pre-pregnancy testosterone and corticosterone levels (as estimates of intra-uterine testost ... | 2010 | 19958785 |
| the effects of landscape modifications on the long-term persistence of animal populations. | the effects of landscape modifications on the long-term persistence of wild animal populations is of crucial importance to wildlife managers and conservation biologists, but obtaining experimental evidence using real landscapes is usually impossible. to circumvent this problem we used individual-based models (ibms) of interacting animals in experimental modifications of a real danish landscape. the models incorporate as much as possible of the behaviour and ecology of four species with contrasti ... | 2010 | 20126614 |
| field vole (microtus agrestis) seasonal spacing behavior: the effect of predation risk by mustelids. | there are numerous studies showing that predation risk may change different aspects of the behavior of prey, such as habitat use, activity pattern, and foraging. prey should exhibit the strongest antipredatory response against their most deadly predator. small mustelids are considered the most important mammalian predators of voles. nevertheless, there is no general agreement as to whether strong antipredatory reactions exist in natural free-living populations of voles. here, we studied the fiel ... | 2010 | 20352179 |
| chromosomal evolution of arvicolinae (cricetidae, rodentia). iii. karyotype relationships of ten microtus species. | the genus microtus consists of 65 extant species, making it one of the rodentia genera with the highest number of species. the extreme karyotype diversification in microtus has made them an ideal species group for comparative cytogenetics and cytotaxonomy. conventional comparative cytogenetic studies in microtus have been based mainly on chromosomal banding patterns; the number of microtus species examined by molecular cytogenetics-cross-species chromosome painting-is limited. in this study, we ... | 2010 | 20379801 |
| the relative susceptibility of the field-vole to the bovine, human and avian types of tubercle bacilli and to the vole strain of acid-fast bacillus (wells, 1937). | 1939 | 20475488 | |
| further experiments on the field vole with tubercle bacilli. | 1941 | 20475590 | |
| phenotypic evolution of dispersal-enhancing traits in insular voles. | evolutionary theory predicts that in metapopulations subject to rapid extinction-recolonization dynamics, natural selection should favour evolution of traits that enhance dispersal and recolonization ability. metapopulations of field voles (microtus agrestis) on islands in the stockholm archipelago, sweden, are characterized by frequent local extinction and recolonization of subpopulations. here, we show that voles on the islands were larger and had longer feet than expected for their body size, ... | 2011 | 20685710 |