| [characterization of rickettsia tsutsugamushi strains newly isolated in ehime prefecture, japan]. | five strains of rickettsia tsutsugamushi were isolated in ehime prefecture during december 1987 to january 1990. of these, two strains, the yamazaki and noma-3, were isolated at noma area of imabari city and three strains, the kakiwara-10, -11, -12, at kakiwara area of uwajima city. the yamazaki strain was isolated from a patient of tsutsugamushi disease and the other strains from wild rodents (apodemus speciosus). these strains showed virulence in euthymic mice. the calculated ld50 of the yamaz ... | 1992 | 1402103 |
| experimental evaluation of mink and apodemus speciosus in the echinococcus multilocularis life-cycle in hokkaido, japan. | the epizootiological status of mink (mustela vison) as definitive hosts and apodemus speciosus as intermediate hosts in the transmission of echinococcus multilocularis in hokkaido, japan, were evaluated by orally inoculating mink with protoscoleces, and a. speciosus with eggs of the cestode, respectively. no tapeworms were recovered from the alimentary tract of the mink, and no hydatid cysts were recovered from the viscera of the egg-inoculated a. speciosus. we conclude that mink and a. speciosu ... | 1992 | 1512885 |
| development and application of protein g antibody assay for the detection of antibody to hantavirus. | a new serodiagnostic method designated protein-g antibody assay (pga) was developed for detection of hantavirus infection in various species of animals. the assay procedure includes reacting the sera with hantavirus-infected cells on glass slides, followed by incubation of biotinylated protein g and amplification with the avidin-biotinylated peroxidase complex. specific antibody in rabbit, rat, mouse and mongolian gerbil serum was detected by this method. the pga titres were similar to those of ... | 1992 | 1634601 |
| cytogenetical survey in wild population of japanese wood mouse, apodemus speciosus and its breeding. | | 1973 | 4807733 |
| studies on babesia first found in murine in japan: epidemiology, morphology and experimental infection. | during the period from november 1980 to september 1982, 314 small wild mammals were captured in 5 localities in japan. twenty-six out of 86 apodemus speciosus and one out of 6 a. argenteus both species captured in shiga prefecture (35 degrees 02'n, 135 degrees 50'e, 330 m elev .) were positive for babesia. the parasitemia in those animals was generally low. the infection rate did not show any significant difference between sexes of the host or between seasons, whereas it tended to go up with the ... | 1984 | 6730782 |
| evidence for the existence of puumula-related virus among clethrionomys rufocanus in hokkaido, japan. | we conducted field surveys of indigenous rodent species in hokkaido, japan from 1980 to 1993. serum samples were collected from 663 rodents, including clethrionomys rufocanus, apodemus speciosus, a. argenteus, and c. rutilus. antibody to hantavirus was determined by the protein g antibody assay. positive c. rufocanus were detected in seven of eight collection sites, but no antibody was detected in the remaining rodent species. to reveal the serotype of the circulating virus in c. rufocanus, anti ... | 1995 | 7573700 |
| genomic analysis of borrelia japonica sp. nov. isolated from ixodes ovatus in japan. | genetic characteristics of 12 borrelia isolates from the tick, ixodes ovatus, i. persulcatus, and the rodent, apodemus speciosus ainu, in japan were compared to members of the three genospecies of borrelia burgdorferi sensu lato; b. burgdorferi sensu stricto, b. garinii and group vs461. the methods used in this study were the quantitative microplate dna hybridization assay and restriction fragment length polymorphism (rflp) analyses of the flagellin structural genes and the 16s rrna genes. the s ... | 1993 | 7905183 |
| identification of spirochetes isolated from wild rodents in japan as borrelia japonica. | spirochetes isolated from three species of wild mice, apodemus speciosus, apodemus argenteus, and eothenomys smithi, which were caught on honshu, japan, were characterized on the bases of protein profiles, reactivities with monoclonal antibodies (mabs), and dna homology values. all the isolates reacted with mab o1441b, which is specific for borrelia japonica, but not with mab p62, which is specific for borrelia burgdorferi sensu stricto, borrelia garinii, and borrelia afzelii. the dna relatednes ... | 1995 | 7615765 |
| eimerians from different karyotypes of the japanese wood mouse (apodemus spp.), with descriptions of two new species and a redescription of eimeria montgomeryae lewis and ball, 1983. | examination of 131 wood mice (apodemus spp.) representing 2 species and 6 subspecies collected from the japanese islands of hokkaido, honshu, kyushu, and tsushima showed that 70 mice (53%) had coccidian oocysts in their feces. these included 21 of 42 (50%) apodemus argenteus argenteus; 7 of 14 (50%) apodemus argenteus hokkaidi; 2 of 3 (67%) apodemus argenteus sagax; 3 of 9 (33%) apodemus speciosus ainu; 36 of 61 (59%) apodemus speciosus speciosus; and 1 of 2 (50%) apodemus speciosus tusimaensis. ... | 1985 | 4093813 |
| mixed infection of different borrelia species among apodemus speciosus mice in hokkaido, japan. | the wood mouse (apodemus speciosus) serves as a wildlife reservoir for lyme disease spirochetes in hokkaido, japan. to isolate borrelia species, we captured 34 wood mice in an area where borrelia species are endemic during october 1993. the earlobes (right and left), heart, spleen, and urinary bladder from each mouse were used as culture sources. as a result of culture 73 isolates from 21 mice were classified by rrna gene restriction fragment length polymorphism analysis. ribotype groups iii (bo ... | 1995 | 7536218 |
| [serosurvey for spotted fever group rickettsial infection in vertebrates in shimane prefecture]. | we carried out a survey for the prevalence of antibodies to the spotted fever group (sfg) rickettsia in vertebrates such as dogs, cattle, deer, and mice in shimane prefecture. rickettsia japonica was employed as antigen in indirect immunofluorescence (if) tests. the experiment for natural infections using decoy animals was performed in the field of the endemic area. 1. among 115 street dogs, 18.3% possessed the antibodies against sfg rickettsia, while all of the 8 hunting dogs had the antibodies ... | 1995 | 7602185 |
| transovarial transmission of rickettsia tsutsugamushi in leptotrombidium pallidum successively reared in the laboratory. | engorged larvae of leptotrombidium pallidum were collected from a wild rodent, apodemus speciosus, and reared in a plastic container fed with fresh eggs of colembolla, sinella curviseta, under moist conditions at 25 degrees c. fully developed adults were separated into individual containers and a proven male was paired with a suspected female. of the pairings, 38 produced larvae and 4 infected colonies were established. females in these colonies were shown to be infected with karp type of ricket ... | 1988 | 3149693 |
| prevalence of spotted fever group rickettsia antibody in apodemus speciosus captured in an endemic focus in miyazaki prefecture, japan. | fourteen of apodemus speciosus (large japanese field mouse) were captured near the place where one of the patients with spotted fever group rickettsiosis had been infected, in takaoka town, miyazaki prefecture. in the town, four human cases were reported. all of the mice had antibodies against rickettsia japonica and r. montana. the incidence of the antibody was significantly higher in apodemus mice in the area than in those from nonendemic area. | 1990 | 2395224 |
| comparison of ehrlichia muris strains isolated from wild mice and ticks and serologic survey of humans and animals with e. muris as antigen. | in metropolitan tokyo, the ehrlichia muris seropositivity rate of 24 wild mice was 63% in hinohara village, but in the surrounding areas, it was 0 to 5%. this finding suggests that the reservoir of e. muris is focal. among the 15 seropositive mice, ehrlichiae were isolated from 9 apodemus speciosus mice and 1 a. argenteus mouse, respectively. five ehrlichial isolates were obtained from 10 ticks (haemaphysalis flava) collected in asuke town, aichi prefecture, where the e. muris type strain had be ... | 1999 | 10074536 |
| transmission of rickettsia tsutsugamushi from apodemus speciosus, a wild rodent, to larval trombiculid mites during the feeding process. | transmission of rickettsia tsutsugamushi (rt) from a rodent to trombiculid mites was studied. wild rodents, apodemus speciosus, were subcutaneously inoculated with karp strain of rt, and larval trombiculid mites were released on the ear lobes for feeding, 10 and 20 days after infection. isolation of rt was performed from individual mites or pools of 2 to 7 mites by the mouse passage method. from apodemus 10 days after rt infection, possibly at the time of high rickettsiaemia, the infection rates ... | 1990 | 2127292 |
| trombiculid mites (acari: trombiculidae) and rickettsia tsutsugamushi isolated from wild rodents in a new endemic area of japan. | investigations of trombiculid mites and rickettsia tsutsugamushi in wild rodents were made in southern gifu prefecture where patients infected with tsutsugamushi disease recently have been found. a total of 16,396 trombiculid mites, consisting of 10 species from three genera, was collected from 170 apodemus speciosus in two locations. kani-sakahogi and kuze. leptotrombidium scutellare (nagayo et al.) (44.0%) was most predominant, followed by l. pallidum (nagayo et al.) (26.9%); l. fuji (kuwata e ... | 1990 | 2117663 |
| [the relationship of the population dynamics of gamasid mites with the population dynamics of their murine rodent hosts in the sikhote-alin]. | 22,500 mites were collected from 4515 rodents over a period of 5 years in the sikhote-alin reserve. the abundance dynamics of 4, out of 5, most numerous species of mites (laelaps pavlovskyi, l. clethrionomydis, eulaelaps stabularis, haemogamasus serdjukovae) depends on the cyclic fluctuations in the number of rodents. a direct connection between the annual and, to some extent, seasonal dynamics of the abundance of parasites and that of their hosts is most distinct in l. pavlovskyi, an epizoon pa ... | 1991 | 1813842 |
| host associations and seasonal abundance of immature ixodes persulcatus (acari: ixodidae) in a lyme-disease-endemic area in china. | ticks of nine small mammal species were studied in an area of endemic lyme disease in hailin county, heilongjiang province, from 1 may to 10 october 1986. the bulk (93%) total small mammal captures were apodemus speciosus (45%), clethrionomys rufocanus (31%), a. agrarius (11%) and eutamias sibiricus; (5%): these host species accounted for 97% of the 162 ticks collected. ixodes persulcatus schulze were most abundant on e. sibiricus (0.64 larvae and 0.08 nymphs/squirrel), and less abundant on a. a ... | 1991 | 1773682 |
| susceptibility of wild mice to yersinia pseudotuberculosis and yersinia enterocolitica. | laboratory-born progeny and adult populations of old world woods mice (apodemus speciosus) trapped in a certain area where yersinia pseudotuberculosis was prevalent among wild animals, were challenged with y. pseudotuberculosis and yersinia enterocolitica to determine the ecology of yersinia in wild mice. the laboratory-born progeny population was associated with infection with y. pseudotuberculosis but not with y. enterocolitica serotype o:3 and was found to be nearly 200 times more susceptible ... | 1991 | 1755925 |
| epidemiological survey of small rodents for spotted fever rickettsial antibody in hokkaido, japan. | the prevalence of antibody against spotted fever group rickettsia (sfgr) was investigated with rickettsia japonica antigen in small rodents captured in an area in hokkaido, where no human cases of sfgr infection had been reported. antibody against sfgr was found in apodemus speciosus and clethrionomys rufocanus but not in apodemus argenteus. none of these rodents had antibody against r. typhi. this is the first report of the antibody against sfgr in rodents in hokkaido. | 1996 | 8806039 |
| epidemiology of tsutsugamushi disease in relation to the serotypes of rickettsia tsutsugamushi isolated from patients, field mice, and unfed chiggers on the eastern slope of mount fuji, shizuoka prefecture, japan. | a total of 59 strains of rickettsia tsutsugamushi were isolated from patients (24 isolates), apodemus speciosus mice (30 isolates), and unfed larvae of leptotrombidium scutellare (2 isolates) and leptotrombidium pallidum (3 isolates) in the gotenba-oyama district, shizuoka prefecture, japan. all these isolates were classified into the three serotypes karp, kawasaki, and kuroki based on reactivity with strain-specific monoclonal antibodies. kawasaki- and karp-type rickettsiae were isolated from l ... | 1992 | 1452653 |
| hymenolepis pseudodiminuta tenora et al. 1994 from apodemus speciosus and h. diminuta: a comparison of experimental infections in rats. | the successful maintenance of hymenolepis pseudodiminuta, isolated from apodemus speciosus, is described for the first time. in the laboratory, the flour beetle, tribolium confusum, and f344 rats could serve as intermediate and definitive hosts, respectively. in single worm infections with h. pseudodiminuta, which were carried in two groups of rats, adult worms were recovered from eight and seven out of ten rats, respectively, while hymenolepis diminuta was found in all of ten rats 6 weeks after ... | 2003 | 12632167 |
| prevalence of pneumocystis carinii in wild rodents in japan. | during the period from november 1980 to april 1984, 292 small wild rodents were captured in 6 localities in japan. eleven out of 142 apodemus speciosus, 1 out of 11 a. argenteus, 4 out of 40 microtus montebelli and 2 out of 3 mus musculus were positive for pneumocystis carinii. the intensity of infection was generally low and the infection rate did not show any significant difference between sexes of the host animals. the seasonal prevalence of infection in a. speciosus was not remarkable, but w ... | 1986 | 3526764 |
| leptospira canicola isolated from apodemus speciosus speciosus in kyushu. | | 1976 | 957526 |
| distribution of borrelia species associated with lyme disease in the subalpine forests of nagano prefecture, japan. | we surveyed the natural distribution of borrelia species associated with lyme disease in the subalpine forests of nagano prefecture, japan, during 1993-94. tick-derived isolates (n = 112) from ixodes persulcatus and rodent-derived isolates (n = 55) from apodemus argenteus, apodemus speciosus, eothenomys andersoni, eothenomys smithii, and microtus montebelli were classified by rrna gene restriction fragment length polymorphism analysis (rflp ribotyping). ribotype group iv (an intraspecific varian ... | 1996 | 8709867 |
| prevalence of antibodies to borrelia spirochetes among wild small rodents in central and western japan. | field rodents serve as a reservoir for lyme disease spirochetes. to evaluate the antibody responses of rodents against different borrelia species in relation to fauna of vector ticks feeding on them, we examined 272 sera of wild rodents, apodemus speciosus, a. argenteus, and eothenomys smithii, obtained in 27 locations in central and western japan from 1981 to 1994. as to prevalences by rodent species using immunoperoxidase test, a. speciosus, a. argenteus and e. smithii showed 29.4%, 11.6% and ... | 1995 | 8551974 |
| developmental and morphological characteristics of taenia taeniaeformis (batsch, 1786) in clethrionomys rufocanus bedfordiae and rattus norvegicus from different geographical locations. | developmental and morphological characteristics of 3 isolates of taenia taeniaeformis isolated from clethrionomys rufocanus bedfordiae in abuta (70 km southwest of sapporo), japan (isolate acr), and from rattus norvegicus in sapporo, japan (isolate srn) and kuala lumpur, malaysia (isolate krn) were compared. eggs of 3 isolates were administered to several species of rodents. isolate acr infected c. rufocanus bedfordiae, apodemus speciosus, and apodemus argenteus, but not rats or mice, whereas is ... | 1994 | 8195949 |
| helminth parasites of apodemus speciosus and a. argenteus from the koshiki islands, japan, with a description of subulura suzukii sp. n. | | 1981 | 7343688 |
| comparative studies on borrelia afzelii isolated from a patient of lyme disease, ixodes persulcatus ticks, and apodemus speciosus rodents in japan. | the genospecies borrelia afzelii was isolated from a patient of lyme disease in hokkaido, japan, for the first time, by culturing the minced erythema lesion in bsk ii medium. two analytical methods, rrna gene restriction fragment length polymorphism (rflp) and polymerase chain reaction (pcr) using the specific primer set to amplify the 16s rrna gene, revealed that this clinical isolate belongs to the group of b. afzelii. in our culture collection of spirochetes, part of the isolates from ixodes ... | 1994 | 7968670 |
| characterization of monoclonal antibodies for identification of borrelia japonica, isolates from ixodes ovatus. | monoclonal antibodies for identification of borrelia japonica isolated from tick, ixodes ovatus and long-tailed shrew, sorex unguiculatus in japan and borrelia related to lyme disease (borrelia burgdorferi sensu lato) were prepared and characterized. all isolates belonging to b. japonica and isolates from i. dentatus and cottontail rabbit in north america reacted with mab o1441b against flagellin which was prepared from immunized mice with strain ho14, type strain of b. japonica, but isolates fr ... | 1994 | 7935066 |
| [a new natural focus of scrub typhus found in hunchun]. | from may to june 1992, apodemus agrarius and apodemus speciosus were captured in hunchun, jilin province. four strains of rickettsia tsutsugamushi were isolated from viscera of rats and trombiculid mites. at the same time, the antibody against rickettsia tsutsugamushi was assayed in the sera of the local people and the wild rats. the positive rates were 15.2% and 16.4%, respectively. the above results showed that a natural focus of scrub typhus exists in hunchun area. | 1994 | 8082138 |
| borrelia japonica in nature: genotypic identification of spirochetes isolated from japanese small mammals. | spirochetes were isolated from earlobe tissues of shrews (sorex unguiculatus, sorex caecutiens, and crocidura dsienezumi), voles (clethrionomys rufocanus), and mice (apodemus argenteus and apodemus speciosus) captured in various localities in japan. the isolates were identified as borrelia japonica by rrna gene restriction fragment length polymorphism analysis. the data suggest that these small mammals are candidates of reservoir hosts for b. japonica. | 1994 | 7869959 |
| host substitution by ixodes persulcatus (acari: ixodidae) larvae in the years of deep depression in the abundance of small mammals. | a phenomenon of host substitution by the taiga tick (ixodes persulcatus) larvae was observed by the authors in the western part of the soviet far east. in the mountain forests where the highest abundance of i. persulcatus was found, larvae usually fed on small mammals (primarily on clethrionomys rufocanus, c. rutilus and apodemus speciosus). numerous larvae were found, however, on the mountain hare (lepus timidus) in the years of deep depression in the abundance of small mammals. the host substi ... | 1992 | 1644364 |
| isolation of spotted fever group rickettsia from apodemus speciosus in an endemic area in japan. | a spotted fever group rickettsia was isolated from apodemus mice captured near the site where a person had been infected in miyazaki prefecture. antigenic characteristics of the isolate designated as strain to-1 were compared with those of rickettsia japonica (strain yh) and rickettsia montana (atcc vr611) by the indirect fluorescent antibody test with 14 serum specimens obtained from apodemus speciosus, immune rat antisera against the strains to-1 and yh, and three patients' sera. the titers of ... | 1992 | 1434069 |
| infectivity and pathogenicity of yersinia enterocolitica serovar 0:8 to wild rodents in japan. | three species of wild rodents, anderson's red-backed voles (eothenomys andersoni), large japanese field mice (apodemus speciosus) and small japanese field mice (apodemus argenteus), mainly living in mountainous areas in japan, were challenged orally with yersinia enterocolitica serovar 0:8 to determine infectivity and pathogenicity of this micro-organism with respect to wild rodents. y. enterocolitica 0:8 was shown to colonize the intestinal tract of these three types of wild rodents, and was oc ... | 1994 | 7701863 |
| evolution of restriction sites of ribosomal dna in natural populations of the field mouse, apodemus speciosus. | an analysis by restriction endonuclease digestion of ribosomal dna (rdna) was carried out in natural populations of apodemus speciosus, a field mouse that is endemic to japan. two restriction sites, the ecori (e3) and drai (d4) sites, in the nontranscribed spacer region downstream from the gene for 28s rna showed polymorphism within and between individuals in the populations from the japanese main islands. by contrast, populations from the small adjoining islands which are thought to have separa ... | 1994 | 7909569 |
| location and ultrastructure of borrelia japonica in naturally infected ixodes ovatus and small mammals. | the internal organs of ixodes ovatus and the ears of wild rodents (apodemus speciosus, eothenomys smithii) and an insectivore (crocidura dsinezumi) were cultured to isolate borreliae; positive samples were examined for the distribution and dissemination of spirochetes in the host tissues using electron microscopy. seven isolates were derived from the unfed ticks and the three species of mammals. these isolates were identified as borrelia japonica judging from the outer surface protein profile us ... | 1997 | 9087963 |
| characterization of borrelia spp. isolated from the tick, ixodes tanuki and small rodents in japan. | spirochetes were isolated from the tick, ixodes tanuki, as well as wood mice (apodemus speciosus) and voles (clethrionomys rufocanus and eothenomys smithii), caught in fukui, tokushima, and hokkaido, japan, from 1991 to 1993. spirochetes were characterized on the basis of protein profiles, reactivities with monoclonal antibodies (mabs), outer surface protein a gene (ospa) and outer surface protein b gene (ospb) amplification analysis, rrna gene and flagellin gene restriction fragment length poly ... | 1996 | 9359053 |
| comparative functional morphology of mandibular forward movement during mastication of two murid rodents, apodemus speciosus (murinae) and clethrionomys rufocanus (arvicolinae). | the anatomy of the masticatory apparatus, the direction in which masticatory muscles act during mastication, and jaw muscle forces as estimated by muscle dry weight are compared between two murid rodents, the japanese field mouse (apodemus speciosus, subfamily murinae) and the gray red-backed vole (clethrionomys rufocanus; subfamily arvicolinae). the occlusal forces exerted by the deep masseter and the anterior temporalis are large in c. rufocanus. furthermore, in this species, the angle between ... | 1997 | 8989873 |
| reservoir competence of the vole, clethrionomys rufocanus bedfordiae, for borrelia garinii or borrelia afzelii. | in autumn of 1994 and spring of 1995, we examined borrelia infection among microtinae voles, clethrionomys rufocanus bedfordiae, in hokkaido, japan. in bsk culturing of the earlobe tissues of 45 c. rufocanus bedfordiae captured, twelve rodents were positive for borrelia. eight isolates were used for the polymerase chain reaction (pcr) and the restriction fragment length polymorphism (rflp) analysis. according to the results, these isolates were classified into b. garinii or b. afzelii. it is con ... | 1996 | 8871531 |
| a comparative epidemiological study of hantavirus infection in japan and far east russia. | hantaviruses are causative agents of some severe human illnesses, including hemorrhagic fever with renal syndrome (hfrs) and hantavirus pulmonary syndrome (hps). the viruses are maintained by rodent hosts, and humans acquire infection by inhaling virus-contaminated excreta from infected animals. to examine the epidemiology of hantavirus infections in japan and far east russia, we conducted epidemiological surveys in these regions. in japan, anti-hantavirus antibodies were found in four rodent sp ... | 2007 | 17405352 |
| proportions of various endocrine cells in the pancreatic islets of wood mice (apodemus speciosus). | using wood mice (apodemus speciosus) captured in the wild in niigata, we analysed the proportion of various endocrine cells in pancreatic islets for both immunohistochemical and microscopic characteristics. in both the dorsal and ventral portions of the pancreas, the centre of the pancreatic islets was occupied predominantly by insulin-positive (b) cells, surrounded by glucagon-positive (a), somatostatin-positive (d), and pancreatic-polypeptide-positive (pp) cells. although the proportions of th ... | 1999 | 10208028 |
| seasonal changes in the hypothalamo-pituitary-testes axis of the japanese wood mouse (apodemus speciosus). | seasonal changes in the hypothalamo-pituitary-testes axis of the japanese wood mice (apodemus speciosus) were studied. the testes, epididymis, pituitary and hypothalamus were compared between mice in the breeding season (july) and non-breeding season (october) using morphological techniques, and the plasma testosterone level was evaluated by enzyme immunoassay. significant differences in these tissues were observed between the breeding season and the non-breeding season. specifically, difference ... | 2000 | 11074401 |
| human babesiosis in japan: isolation of babesia microti-like parasites from an asymptomatic transfusion donor and from a rodent from an area where babesiosis is endemic. | to determine the source of infection for the japanese index case of human babesiosis, we analyzed blood samples from an asymptomatic individual whose blood had been transfused into the patient. in addition, we surveyed rodents collected from near the donor's residence. examination by microscopy and pcr failed to detect the parasite in the donor's blood obtained 8 months after the donation of the blood that was transfused. however, we were able to isolate babesia parasites by inoculating the bloo ... | 2001 | 11376054 |
| isolation of tick-borne encephalitis virus from wild rodents and a seroepizootiologic survey in hokkaido, japan. | to determine the vertebrate host of tick-borne encephalitis (tbe) virus in the southern part of hokkaido, japan, virus isolation was performed using spleens from small mammals captured in the area. two virus strains were isolated, one strain from apodemus speciosus and another from clethrionomys rufocanus. virus isolates were inoculated onto baby hamster kidney cell monolayers and antigen slides were prepared for an indirect immunofluorescent antibody assay. two isolates were identified as tbe v ... | 1999 | 10072153 |
| detection of babesia microti-like parasite in filter paper-absorbed blood of wild rodents. | the first case of human babesiosis was reported in japan. the epidemiology of this disease in japanese nature remains unclear. in this study, 97 common field mice captured in hokkaido, japan, were examined. blood specimens absorbed onto filter papers were eluted and tested by nested pcr using specific primers for the b. microti nuclear small subunit rrna genome. twenty-three percent (11/47) of apodemus speciosus and four percent (2/50) of clethrionomys rufocanus were positive. the 159-bp primary ... | 2002 | 11913551 |
| mechanical advantage of area of origin for the external pterygoid muscle in two murid rodents, apodemus speciosus and clethrionomys rufocanus. | the actions of masticatory muscles in relation to transverse grinding, associated with forward masticatory movement of the mandible, were investigated by using a mechanical model in the two murid rodents, the japanese field mouse (apodemus speciosus: subfamily murinae) and the gray red-backed vole (clethrionomys rufocanus: subfamily arvicolinae). furthermore, statics of the masticatory system on a sagittal plane while chewing is taking place were also analyzed in these rodents. the inward grindi ... | 1999 | 10201116 |
| survey on wild rodents for endoparasites in iwate prefecture, japan. | wild rodents (58 apodemus speciosus, 29 a. argenteus and 7 microtus montebelli) were surveyed for endoparasites in iwate prefecture, japan, from october to december 1995 and from april to october 1996. two trematodes (echinostoma macrorchis, plagiorchis muris), 4 or more cestodes (hymenolepis diminuta, raillietina coreensis, cladothyridium spp., cysticercus fasciolaris), 12 nematodes (carolinensis minutus, eucoleus sp., heligmosomoides kurilensis, h. protobullosus, h. speciosus, heterakis spumos ... | 2003 | 14600361 |
| balancing function of the masticatory muscles during incisal biting in two murid rodents, apodemus speciosus and clethrionomys rufocanus. | the functional significance of masticatory muscle direction was estimated using a mechanical model in two murid rodents: the japanese field mouse (apodemus speciosus) and the gray red-backed vole (clethrionomys rufocanus). theoretical analyses of the data suggest that a balancing mechanism among the muscle forces occurs during incisal power stroke. the activation of the large deep masseter in both murids results in marked tensile separation of two hemimandibles at the flexible mandibular symphys ... | 1998 | 9503662 |
| u.s.-type babesia microti isolated from small wild mammals in eastern hokkaido, japan. | our previous report demonstrated that small wild rodents in japan harbored two types of novel babesia microti-like parasites (kobe and hobetsu types), but not the type widely distributed throughout the temperate zones of north american and eurasian continents (u.s. type). in this study, we surveyed small wild mammals collected at various places in the northern part of japan, seeking for u.s.-type b. microti. a total of 197 small mammals comprising 10 species, apodemus speciosus, a. argenteus, cl ... | 2004 | 15353841 |
| detection of cryptosporidium muris type oocysts from beef cattle in a farm and from domestic and wild animals in and around the farm. | cryptosporidium muris type oocysts were detected from 21 of 516 beef cattle in a farm. then we surveyed cryptosporidium oocysts in 348 beef and dairy cattle, 500 pigs, 101 dogs, 38 wild animals and 11 zoo-kept animals in and around the farm. oocysts were detected from only 2 of 25 japanese field mice, apodemus speciosus in the same farm. gene analysis suggested that the oocysts were different from the c. muris type bovine isolate. | 2004 | 15353852 |
| population structure of the large japanese field mouse, apodemus speciosus (rodentia: muridae), in suburban landscape, based on mitochondrial d-loop sequences. | genetic structure of the large japanese field mouse populations in suburban landscape of west tokyo, japan was determined using mitochondrial dna control region sequence. samples were collected from six habitats linked by forests and green tract along the tama river, and from two forests segregated by urban areas from those continuous habitats. thirty-five haplotypes were detected in 221 animals. four to eight haplotypes were found within each local population belonging to the continuous landsca ... | 2004 | 15487988 |
| isolation of tannin-degrading bacteria isolated from feces of the japanese large wood mouse, apodemus speciosus, feeding on tannin-rich acorns. | bacteria with tannase activity were isolated from the feces of the japanese large wood mouse, apodemus speciosus. they were largely classified into two groups: gram-positive cocci and gram-positive bacilli. genotypic analysis using a species-specific pcr assay as well as biochemical tests identified all cocci as streptococcus gallolyticus. a pcr assay targeting a genus-specific sequence in the 16s/23s rdna spacer region and additional 16s rdna sequencing indicated that the bacilli belong to the ... | 2005 | 15997709 |
| complex structure of b-chromosomes in two mammalian species: apodemus peninsulae (rodentia) and nyctereutes procyonoides (carnivora). | b-chromosomes (bs) of two mammalian species, raccoon dog (nyctereutesprocyonoides, carnivora) and asian wood mouse (apodemus peninsulae, rodentia) were investigated using chromosome segment microdissection and double-colour fish. in the raccoon dog, all b-chromosomes showed homology with each other but not with the a-chromosomes. two segment-specific probes (from proximal and distal parts of b) have been localized in corresponding chromosome parts, with significant variation in their sizes. in a ... | 2002 | 11993931 |
| climate change and size evolution in an island rodent species: new perspectives on the island rule. | as stated by the island rule, small mammals evolve toward gigantism on islands. in addition they are known to evolve faster than their mainland counterparts. body size in island mammals may also be influenced by geographical climatic gradients or climatic change through time. we tested the relative effects of climate change and isolation on the size of the japanese rodent apodemus speciosus and calculated evolutionary rates of body size change since the last glacial maximum (lgm). currently a. s ... | 2004 | 15266983 |
| human babesiosis in japan: epizootiologic survey of rodent reservoir and isolation of new type of babesia microti-like parasite. | we have carried out epizootiologic surveys at various sites in japan to investigate wild animals that serve as reservoirs for the agents of human babesiosis in the country. small mammals comprising six species, apodemus speciosus, apodemus argenteus, clethrionomys rufocanus, eothenomys smithii, crocidura dsinezumi, and sorex unguiculatus, were trapped at various places, including hokkaido, chiba, shiga, hyogo, shimane, and tokushima prefectures. animals harboring babesia microti-like parasites w ... | 2001 | 11724838 |
| lactobacillus apodemi sp. nov., a tannase-producing species isolated from wild mouse faeces. | a gram-positive, rod-shaped, non-endospore-forming bacterium, strain asb1(t), able to degrade tannin, was isolated from faeces of the japanese large wood mouse, apodemus speciosus. comparative analysis of the 16s rrna gene sequence revealed that the strain could be assigned as a member of the genus lactobacillus. the nearest phylogenetic neighbours were determined as lactobacillus animalis dsm 20602(t) (98.9 % 16s rrna gene sequence similarity) and lactobacillus murinus asf 361 (98.9 %). subsequ ... | 2006 | 16825652 |
| detection of ehrlichial dna in small rodents captured in a woodland area of hokkaido, the northernmost island of japan, where lyme disease is endemic. | the ehrlichial gene was detected in small rodents trapped in a lyme disease-endemic area in hokkaido, the northernmost island of japan. primer pairs of 16s rdna targeting the genus ehrlichia and other regions of the 16s rdna specific for e. chaffeensis and e. muris were used for identification. the dna fragment specific for 16s rdna of ehrlichia spp. was detected in 4 of 94 apodemus speciosus mice (positive rate: 4.3%) and 5 of 73 clethrionomys rufocanus bedfordiae mice (positive rate: 6.8%). th ... | 2005 | 16249629 |
| role of tannin-binding salivary proteins and tannase-producing bacteria in the acclimation of the japanese wood mouse to acorn tannins. | we studied the defense mechanisms against the negative effects of tannins in acorns by using the japanese wood mouse (apodemus speciosus) and acorns of a japanese deciduous oak quercus crispula, which contain 9.9% tannins on a dry weight basis. for the experiment, we allocated 26 wood mice into two groups: acclimated (n = 12) and nonacclimated (n = 14). mice in the nonacclimated group were fed only acorns for 10 d after 4 wk of receiving a tannin-free diet. in contrast, mice in the acclimated gr ... | 2006 | 16770711 |
| prevalence and genetic diversity of bartonella species isolated from wild rodents in japan. | here, we describe for the first time the prevalence and genetic properties of bartonella organisms in wild rodents in japan. we captured 685 wild rodents throughout japan (in 12 prefectures) and successfully isolated bartonella organisms from 176 of the 685 rodents (isolation rate, 25.7%). those bartonella isolates were all obtained from the rodents captured in suburban areas (rate, 51.8%), but no organism was isolated from the animals captured in city areas. sequence analysis of rpob and glta r ... | 2008 | 18606803 |
| investigation of reservoir animals of leptospira in the northern part of miyazaki prefecture. | we surveyed reservoir animals of leptospires in the northern part of miyazaki prefecture, where a cluster of human leptospirosis had occurred during the summer of 2006. leptospira was isolated from 6 of 57 large japanese field mice (apodemus speciosus). the serogroups of the isolates were autumnalis (5 strains) and hebdomadis (1 strain) and the partial nucleotide sequences of their flab genes suggested that the isolates belonged to l. interrogans. the human patient sera reacted specifically with ... | 2008 | 19050356 |
| a novel genotype of cryptosporidium muris from large japanese field mice, apodemus speciosus. | cryptosporidium muris-like oocysts were isolated from large japanese field mice, apodemus speciosus. morphologically, these oocysts resembled those obtained from a c. andersoni kawatabi isolate but were smaller in size than those from a c.muris isolate. following oral inoculation of the oocysts into large japanese field mice and scid mice, developing stages were found in the stomach epithelium. the infectivity of the isolate to wild and laboratory mice was slightly different from that of c.muris ... | 2005 | 16151744 |
| bartonella japonica sp. nov. and bartonella silvatica sp. nov., isolated from apodemus mice. | two bacterial strains, fuji 18-1(t) and fuji 23-1(t), were isolated from the blood of the small japanese field mouse (apodemus argenteus) and the large japanese field mouse (apodemus speciosus), respectively, specimens of which were captured in the forest of mount fuji, japan. phenotypic characterization (growth conditions, incubation periods, biochemical properties and cell morphologies), dna g+c contents (40.1 mol% for strain fuji 18-1(t) and 40.4 mol% for strain fuji 23-1(t)) and sequence ana ... | 2010 | 19656930 |
| geographic variation in morphological traits of the large japanese field mouse, apodemus speciosus (rodentia, muridae), from the izu island group, japan. | we investigated geographic variation in morphological traits of the large japanese field mouse (apodemus speciosus) from the izu island group, japan. there was sexual dimorphism in external characters and cranial measurements; hence, these were considered in subsequent analyses. there was geographic divergence in morphometric characters among populations of the izu island group and honshu. mice from the miyakejima island and niijima-shikinejima islands differed from those of other populations an ... | 2009 | 19798920 |
| a trend of central versus peripheral structuring in mitochondrial and nuclear gene sequences of the japanese wood mouse, apodemus speciosus. | a phylogeographic analysis was performed on japanese endemic wood mice (apodemus speciosus) using nuclear interphotoreceptor retinol binding protein (irbp) gene sequences (1,152 bp), together with previously published mitochondrial cytochrome b (cyt b) data. in the irbp analysis, 40 haplotypes were recovered from 84 individuals by statistical and subcloning methods. substantial sequence variation was determined from the irbp data (pi=0.0047), and no significant evidence of recombination was dete ... | 2008 | 18393564 |
| genotoxic assessment of small mammals at an illegal dumpsite at the aomori-iwate prefectural boundary. | in 2003, we examined the chromosomes of grass voles at an illegal dumpsite at the aomori-lwate prefectural boundary. in subsequent years, from 2003-2006, we surveyed the chromosomes of four species of small mammals, namely, the japanese grass vole (microtus montebelli), the large japanese field mouse (apodemus speciosus), the small japanese field mouse (a. argenteus), and the greater japanese shrew mole (urotrichus talpoides). each annual survey revealed, both on a yearly basis and during the en ... | 2009 | 19341331 |
| Interspecific Differences in Tannin Intakes of Forest-Dwelling Rodents in the Wild Revealed by a new Method Using Fecal Proline Content. | Mammalian herbivores adopt various countermeasures against dietary tannins, which are among the most widespread plant secondary metabolites. The large Japanese wood mouse Apodemus speciosus produces proline-rich salivary tannin-binding proteins in response to tannins. Proline-rich proteins (PRPs) react with tannins to form stable complexes that are excreted in the feces. Here, we developed a new method for estimating the tannin intake of free-living small rodents, by measuring fecal proline cont ... | 2011 | 22161223 |
| genetic and biological characterization of tick-borne encephalitis virus isolated from wild rodents in southern hokkaido, japan in 2008. | tick-borne encephalitis virus (tbev) is a zoonotic agent causing severe encephalitis in humans. a recent epizootiological survey indicated that endemic foci of tbev have been maintained in the southern part of hokkaido until recently. in this study, we sought to isolate tbev from wild rodents in the area. one virus, designated oshima 08-as, was isolated from an apodemus speciosus captured in hokuto in 2008. oshima 08-as was classified as the far eastern subtype of tbev and formed a cluster with ... | 2013 | 23590320 |
| effects of environmental radiation on testes and spermatogenesis in wild large japanese field mice (apodemus speciosus) from fukushima. | the fukushima daiichi nuclear power plant (fdnpp) accident that occurred after the great east japan earthquake in march 2011 released large quantities of radionuclides to the environment. the long-term effects of radioactive cesium (cs) on biota are of particular concern. we investigated the accumulation of radioactive cs derived from the fdnpp accident, and chronic effects of environmental radionuclides on male reproduction, in the large japanese field mouse (apodemus speciosus). in 2013 and 20 ... | 2016 | 27005329 |
| survey of babesia microti infection in field rodents in japan: records of the kobe-type in new foci and findings of a new type related to the otsu-type. | of 247 rodents comprising 5 genera and 7 species collected at 17 sites throughout japan from 2003 to 2005, babesia microti was detected microscopically and by polymerase chain reaction (pcr) in 36 rodents comprising 2 genera and 3 species from 12 sites. based on the analysis of small subunit ribosomal rna gene (ssurdna) sequences, the kobe-type, the etiological type of the first japanese case of human infection was found in apodemus speciosus and apodemus argenteus in aomori, the northernmost pr ... | 2007 | 17237595 |
| differential geographic patterns of mitochondrial dna variation in two sympatric species of japanese wood mice, apodemus speciosus and a. argenteus. | we examined the gene sequences of mitochondrial cytochrome b (cyt b) in two japanese wood mouse species, apodemus speciosus (n = 89) and a. argenteus (n = 46), which are distributed on the four main islands of japan (hokkaido, honshu, shikoku, and kyushu) and on the small islands surrounding them. apodemus speciosus, the larger of the two species, showed substantial genetic variation, with a maximum of 3% sequence divergence, and remarkable phylogenetic subdivision with two major clades. one cla ... | 2004 | 15329497 |
| susceptibility of muridae cell lines to ecotropic murine leukemia virus and the cationic amino acid transporter 1 viral receptor sequences: implications for evolution of the viral receptor. | ecotropic murine leukemia viruses (eco-mlvs) infect mouse and rat, but not other mammalian cells, and gain access for infection through binding the cationic amino acid transporter 1 (cat1). glycosylation of the rat and hamster cat1s inhibits eco-mlv infection, and treatment of rat and hamster cells with a glycosylation inhibitor, tunicamycin, enhances eco-mlv infection. although the mouse cat1 is also glycosylated, it does not inhibit eco-mlv infection. comparison of amino acid sequences between ... | 2014 | 24469466 |
| polymorphisms and functional differences in aryl hydrocarbon receptors (ahr) in japanese field mice, apodemus speciosus. | dioxins, which are unintentionally generated toxic pollutants, exert a variety of adverse effects on organisms. the majority of these effects, which include teratogenesis, immunosuppression, tumor promotion, and endocrine disruption, are mediated through aryl hydrocarbon receptor (ahr), a ligand-activated transcription factor. genetic variations in ahr result in different survivability under exposure to dioxin contamination, which might affect the genetic structure of wildlife populations throug ... | 2010 | 21787614 |
| molecular characterization and specific detection of anaplasma species (ap-sd) in sika deer and its first detection in wild brown bears and rodents in hokkaido, japan. | a previously undescribed anaplasma species (herein referred to as ap-sd) has been detected in sika deer, cattle and ticks in japan. despite being highly similar to some strains of a. phagocytophilum, ap-sd has never been detected in humans. its ambiguous epidemiology and the lack of tools for its specific detection make it difficult to understand and interpret the prevalence of this anaplasma species. we developed a method for specific detection, and examined ap-sd prevalence in hokkaido wildlif ... | 2015 | 26431688 |
| antimicrobial susceptibility of escherichia coli isolates from wild mice in a forest of natural park in hokkaido, japan. | to reveal the antimicrobial susceptibilities of escherichia coli isolates from wild mice, 81 e. coli isolates were obtained from 109 voles (clethrionomys spp.), 52 large japanese field mice (apodemus speciosus) and 19 small japanese field mice (a. argenteus) captured in a forest of natural park, hokkaido of japan. seventy-eight of eighty-one e. coli isolates were susceptible to all 10 antimicrobial agents tested. one e. coli isolate was resistant to ampicillin, dihydrostreptomycin, kanamycin, ch ... | 2011 | 21525710 |
| [new species of the tick, haemoganasus (parasitiformes, gamasoidea)]. | the female of the new species haemogamasus bujakovi sp. n. is described from the tungokochen region of the chita district. two females of the mite were taken from apodemus speciosus and one from clethrionomys rutilus. | 2007 | 1018942 |
| 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 |
| proposed vector candidate: leptotrombidium palpale for shimokoshi type orientia tsutsugamushi. | to identify the vector species for shimokoshi type orientia tsutsugamushi, a survey of larval trombiculid mites was conducted in yamagata prefecture, japan from april to may 2012. in all, 2889 larval trombiculid mites were obtained from 21 apodemus speciosus rodent hosts, 2600 of which were morphologically classified into eight species in three genera. after screening of o. tsutsugamushi dna in individual larval trombiculid mites using real-time pcr targeting the 16s ribosomal rna gene, serotype ... | 2013 | 23253042 |
| estimation of absorbed radiation dose rates in wild rodents inhabiting a site severely contaminated by the fukushima dai-ichi nuclear power plant accident. | the dose rates of radiation absorbed by wild rodents inhabiting a site severely contaminated by the fukushima dai-ichi nuclear power plant accident were estimated. the large japanese field mouse (apodemus speciosus), also called the wood mouse, was the major rodent species captured in the sampling area, although other species of rodents, such as small field mice (apodemus argenteus) and japanese grass voles (microtus montebelli), were also collected. the external exposure of rodents calculated f ... | 2015 | 25666988 |
| effects of isolation by continental islands in the seto inland sea, japan, on genetic diversity of the large japanese field mouse, apodemus speciosus (rodentia: muridae), inferred from the mitochondrial dloop region. | to study the effects of post-glacial isolation by islands on population genetic diversity and differentiation of the large japanese field mouse, apodemus speciosus, we examined partial nucleotide sequences of the mitochondrial dloop region (ca. 300 bp) in 231 individuals collected from islands in the seto inland sea and adjacent regions on honshu and shikoku islands in the western part of the japanese archipelago. molecular phylogenetic and network analyses showed that haplotypes in each island ... | 2017 | 28397602 |
| chromosomal aberrations in large japanese field mice (apodemus speciosus) captured near fukushima dai-ichi nuclear power plant. | since the fukushima dai-ichi nuclear power plant accident, radiation effects on nonhuman biota in the contaminated areas have been a major concern. here, we analyzed the frequencies of chromosomal aberrations (translocations and dicentrics) in the splenic lymphocytes of large japanese field mice (apodemus speciosus) inhabiting fukushima prefecture. a. speciosus chromosomes 1, 2, and 5 were flow-sorted in order to develop a. speciosus chromosome-specific painting probes, and fish (fluorescence in ... | 2017 | 28363014 |
| brachylaima ezohelicis sp. nov. (trematoda: brachylaimidae) found from the land snail ezohelix gainesi, with a note of an unidentified brachylaima species in hokkaido, japan. | in the japanese archipelago, ezohelix gainesi, a member of bradybaenid land snails, is endemic mainly to the island of hokkaido. during july to august of 2016, a survey to detect trematode infections from e. gainesi was carried out at a forest city park in asahikawa, hokkaido. systemic infections of the snails with sporocysts containing short-tailed cercariae were found in 5.3% of 94 individuals examined. furthermore, most of them (90.4%) harbored non-encysted metacercariae within their kidneys. ... | 2017 | 28131768 |
| analysis of the effect of chronic and low-dose radiation exposure on spermatogenic cells of male large japanese field mice ( apodemus speciosus ) after the fukushima daiichi nuclear power plant accident. | in this study we analyzed the effect of chronic and low-dose-rate (ldr) radiation on spermatogenic cells of large japanese field mice ( apodemus speciosus ) after the fukushima daiichi nuclear power plant (fnpp) accident. in march 2014, large japanese field mice were collected from two sites located in, and one site adjacent to, the fnpp ex-evacuation zone: tanashio, murohara and akogi, respectively. testes from these animals were analyzed histologically. external dose rate from radiocesium (com ... | 2017 | 28092218 |
| geographic variation in skull morphology of the large japanese field mice, apodemus speciosus (rodentia: muridae) revealed by geometric morphometric analysis. | we analyzed geographic variation in skull morphology of the large japanese field mouse (apodemus speciosus) and determined changes in skull morphology that occurred during the evolutionary history of a. speciosus in relation to the estimated distribution range in the last glacial maximum (lgm). we analyzed 1,416 specimens from 78 localities using geometric morphometric techniques applied to the dorsal side of the cranium and mandible. while large variations within and among the populations in ho ... | 2016 | 27032678 |
| effect of seasonal changes on testicular morphology and the expression of circadian clock genes in japanese wood mice (apodemus speciosus). | this study aimed to determine the seasonality of reproduction throughout the year in japanese wood mice (apodemus speciosus). the effect of seasonal changes on testicular morphology and the periodic expression of circadian clock genes in the hypothalamus and testes of male individuals was evaluated. we also examined the morphology of the testes and caudae epididymides of male mice. in addition, rt-pcr analysis was carried out with mrna extracted from the hypothalamus and testes to evaluate the e ... | 2015 | 26403397 |
| classification of the spermatogenic cycle, seasonal changes of seminiferous tubule morphology and estimation of the breeding season of the large japanese field mouse (apodemus speciosus) in toyama and aomori prefectures, japan. | the large japanese field mouse, apodemus speciosus, is a potential indicator of environmental stress, but this function has not been confirmed by histological studies. since environmental stress affects the reproductive function of mice, we determined the reproductive characteristics of this species at two locations: toyama (36°35'n, 137°24'e) and aomori (40°35'n, 140°57'e). mice were captured during may-november (n=119) and july-november (n=146) at these locations, respectively. we classified t ... | 2015 | 25754934 |
| geographic variation of absolute and relative lower molar sizes in two closely related species of japanese field mice (apodemus speciosus and apodemus argenteus: muridae, rodentia). | geographic variation of the sizes of lower molar (m1 size) and relative lower molar sizes (size proportions among m1, m2, and m3) were examined in two species of closely related japanese field mice (apodemus speciosus and apodemus argenteus). to determine the cause of the geographic variations observed, phylogeographic structure, interspecific competition, climate, and location (mainland or island) were compared. with regard to the phylogeographic structure, the sizes of the molar and the relati ... | 2017 | 28148213 |
| magnitude of food overabundance affects expression of daily torpor. | many small mammal species use torpor as a strategy for reducing energy expenditure in winter. some rodent hibernators also hoard food to provide reserves of energy, and individuals with large hoards express less torpor than those with smaller reserves. these facts imply that animals can recognize levels of food availability, but where food is very plentiful, it is unclear whether torpor expression is affected by temporal changes in the extent of food overabundance. moreover, the relationship bet ... | 2015 | 25483213 |
| contamination status and possibility of toxic effects of co-planar polychlorinated biphenyls, polycyclic aromatic hydrocarbons, and dichlorodiphenyltrichloroethane in large japanese field mouse (apodemus speciosus) collected from hokkaido and aomori. | contamination levels of coplanar polychlorinated biphenyls (co-pcbs), polycyclic aromatic hydrocarbons (pahs), and dichlorodiphenyltrichloroethane (ddts) were measured in the entire body of the large japanese field mouse (apodemus speciosus) collected from hokkaido (ishikari and rankoshi) and aomori prefecture (takko) in japan. higher concentrations of pcbs including co-pcbs, were observed in the mice collected from ishikari than those from rankoshi. the concentration of pahs in the soil from is ... | 2014 | 25282952 |
| huddling facilitates expression of daily torpor in the large japanese field mouse apodemus speciosus. | small endotherms employ multiple adaptations to maintain energy balance in winter, including spontaneous daily torpor and simultaneous huddling. the relationships between these adaptations have been discussed in several previous studies, but it has not been well-established if huddling actually affects the expression of torpor in small endotherms. we examine whether and how huddling affects the expression of torpor in the large japanese field mouse apodemus speciosus, which is known to become to ... | 2014 | 24813827 |
| dioxin pollution disrupts reproduction in male japanese field mice. | dioxins cause various adverse effects in animals including teratogenesis, induction of drug metabolizing enzymes, tumor promotion, and endocrine disruption. above all, endocrine disruption is known to disturb reproduction in adult animals and may, also seriously impact their offspring. however, most previous studies have quantified the species-specific accumulation of dioxins, whereas few studies have addressed the physiological impacts of dioxins on wildlife, such as reduced reproductive functi ... | 2013 | 24026525 |
| molecular cytogenetic identification and characterization of robertsonian chromosomes in the large japanese field mouse (apodemus speciosus) using fish. | robertsonian (rb) karyotypic polymorphism in apodemus speciosus has interested many researchers with particular referece to the genetic divergence between rb and non-rb populations. failure to find morphologic, biochemical, or genetic differences in previous studies reveals the necessity of focusing on loci on rb chromosomes, which can be characterized by fish mapping with dna probes. in an rb heterozygote, dna probes from laboratory mouse chromosomes (mmus) 1 and 10 were simultaneously hybridiz ... | 2012 | 23030344 |
| novel murine norovirus-like genes in wild rodents in japan. | novel murine norovirus (mnv)-like sequences were detected in 7 (14.9%) of 47 fecal and intestinal samples obtained from wild rodents in japan. sequencing and genetic analyses of the 7 mnv-like genes, 6 derived from apodemus speciosus and 1 from rattus rattus, suggested that these sequences form a cluster distinct from known mnv within genogroup v and differed even among clusters of wild rodents. considering these results, mnv might be genetically diverse depending on the host species or distribu ... | 2012 | 22673564 |
| dynamics, co-infections and characteristics of zoonotic tick-borne pathogens in hokkaido small mammals, japan. | many of the emerging infectious diseases originate in wildlife and many of them are caused by vector-borne pathogens. in japan, zoonotic tick-borne pathogens (tbps) are frequently detected in both ticks and wildlife. here, we studied the infection rates of potentially zoonotic species, including anaplasma, ehrlichia, neoehrlichia and babesia spp., in hokkaido's most abundant small mammals as they relate to variable extrinsic factors that might affect the infection rates of these pathogens. a tot ... | 2016 | 27166277 |
| a hierarchical bayesian model to estimate the unobservable predation rate on sawfly cocoons by small mammals. | predation by small mammals has been reported as an important mortality factor for the cocoons of sawfly species. however, it is difficult to provide an accurate estimate of newly spun cocoons and subsequent predation rates by small mammals for several reasons. first, all larvae do not spin cocoons at the same time. second, cocoons are exposed to small mammal predation immediately after being spun. third, the cocoons of the current generation are indistinguishable from those of the previous gener ... | 2015 | 25691994 |
| isolation of pathogenic yersinia enterocolitica 1b/o:8 from apodemus mice in japan. | yersinia enterocolitica was isolated from 15.7% (88/560) of wild rodents captured in 15 prefectures in japan. prevalences by rodent species were 18.0% (70/388) in japanese field mice (apodemus speciosus), 20% (14/71) in small japanese field mice (apodemus argenteus), and 11% (4/38) in gray red-backed vole (myodes rufocanus bedfordiae), suggesting that these rodent species are important reservoirs of y. enterocolitica. although most of the isolates were identified as biotype 1a, the pathogenic bi ... | 2015 | 25380368 |
| prey susceptibilities, prey utilization and variable attack efficiencies of ural owls. | to investigate the factors that influence prey utilization among predators with active prey, three series of experiments were performed in which ural owls (strix uralensis) searched for and attacked three prey species of wild mice, microtus montebelli, apodemus speciosus, and a. argenteus, in a large flight cage. over the whole study, owls attacked mice about ten times a night. the number of attacks on each prey species did not differ from that predicted by a random attack model. m. montebelli w ... | 1988 | 28311960 |
| detection and genotyping of cryptosporidium spp. in large japanese field mice, apodemus speciosus. | the genus cryptosporidium, which is an obligate intracellular parasite, infects various vertebrates and causes a diarrheal disease known as cryptosporidiosis. wild rodents are naturally infected with zoonotic cryptosporidium; thus, they are potential reservoirs of the parasites. mice are common rodents frequently found in agricultural areas and have many opportunities to contact other wild animals, livestock, and humans. irrespective of the potential risk, there are few epidemiologic studies of ... | 2013 | 23601844 |
| individual variation of daily torpor and body mass change during winter in the large japanese field mouse (apodemus speciosus). | daily torpor is a strategy used by some overwintering small endotherms to aid in energy conservation. however, the pattern of torpor varies among individuals within species and populations, even under the same environmental conditions, with significant implications for survival rate and reproductive success. body mass is one factor that may influence this variation, especially in some small mammals that accumulate fat stores prior to overwintering. however, to our knowledge there has been no pre ... | 2018 | 30194463 |
| environmental radiation on large japanese field mice in fukushima reduced colony forming potential in hematopoietic progenitor cells without inducing genomic instability. | to study the environmental radiation effects of wild animals after the fukushima dai-ichi nuclear power plant accident, we assessed effects on hematopoietic progenitor cells (hpcs) in large japanese field mice (apodemus speciosus). | 2020 | 32791031 |