| retinal inputs and laminar distributions of the dorsal lateral geniculate nucleus relay cells in the eastern chipmunk (tamias sibiricus asiaticus). | retinal inputs and their laminar distributions in the dorsal lateral geniculate nucleus (lgnd) of the eastern chipmunk (tamias sibiricus asiaticus) were studied using histological and microelectrode recording techniques. a previous anatomical study (fukuda et al. 1986a) indicated that the chipmunk lgnd had five laminae: contralaterally (contra) innervated lamina 1 and ipsilaterally (ipsi) innervated lamina 2 in its ventromedial part; laminae 3a (contra), 3b (ipsi) and 3c (contra) in its dorsolat ... | 1988 | 2458276 |
| innervation of the incisors and periodontal ligament in several rodents: an immunohistochemical study of neurofilament protein and glia-specific s-100 protein. | the present immunohistochemical study by use of antisera against neurofilament protein (nfp) and s-100 protein dealt with the innervation of the upper incisors and periodontal ligament in five species of rodents including the guinea pig, hamster, mongolian gerbil (meriones unguicularis), mouse and squirrel (tamias sibiricus). the innervation pattern of the periodontal ligament and dental pulp in the incisors of five rodents was fundamentally identical to that in the rat, which we have previously ... | 1989 | 2497619 |
| ipsilateral retinal projections and laminations of the dorsal lateral geniculate nucleus in the eastern chipmunk (tamias sibiricus asiaticus). | the ipsilateral retinal projections and laminations of the dorsal geniculate nucleus (lgnd) were studied in the eastern chipmunk (tamias sibiricus asiaticus). from cyto-, myelo- and chemoarchitectures the lgnd was divided into the ventromedial and dorsolateral parts. anterograde axonal transport of wheat germ agglutinated horseradish peroxidase (wga-hrp) and fink-heimer staining after unilateral eye removal both indicated that the ipsilateral projection terminates in lamina 2 of the ventromedial ... | 1986 | 3779388 |
| the first record of brevistriata bergerardi durette-desset, 1970 from an asiatic chipmunk, tamias sibiricus lineatus siebold, in hokkaido, japan. | | 1986 | 3820909 |
| experimental infection of the korean chipmunk (tamias sibiricus asiaticus, gmelin) with m leprae. | | 1974 | 4609930 |
| pneumonic pasteurellosis associated with pasteurella haemolytica in chipmunks (tamias sibiricus). | a laboratory study was performed in order to identify the possible cause of death in chipmunks (tamias sibiricus) imported from china with respiratory disease. severe congestion, alveolar oedema and fibrinous pleuritis were observed. biochemical analyses identified the causative organism as pasteurella haemolytica. an in vitro susceptibility test using various antimicrobial agents revealed sensitivity to beta-lactams (ampicillin and amoxicillin) and streptomycin. | 1996 | 8919970 |
| iodothyronine deiodinases in a mammalian hibernator, the chipmunk (tamias asiaticus). | we examined the activities of iodothyronine deiodinase, a key enzyme for thyroid hormone metabolism, in selected tissues of the chipmunk (tamias asiaticus), a mammalian hibernator, of both sexes in the summer season. reverse t3 5'-deiodinase (5'-d) activity was the highest in the liver followed by the kidney; t4 5'-d activity was the highest in brown adipose tissue (bat) and t3 5'-deiodinase (5-d) activity was the highest in the testes followed by the brain. distributions of three types of deiod ... | 1997 | 9467891 |
| infectivity to experimental rodents of cryptosporidium parvum oocysts from siberian chipmunks (tamias sibiricus) originated in the people's republic of china. | we isolated cryptosporidium parvum-type oocysts from naturally infected siberian chipmunks which originated in the people's republic of china and examined the infectivity to rodents as experimental animals. the naturally infected chipmunks did not show any clinical symptoms. the oocysts were 4.8 x 4.2 microm on average in size. they were ovoid and morphologically similar to the c. parvum oocysts isolated from human and cattle. experimental rodents were inoculated with 1.6 x 10(6) original oocyst ... | 2000 | 10852396 |
| evolution of genome organizations of squirrels (sciuridae) revealed by cross-species chromosome painting. | with complete sets of chromosome-specific painting probes derived from flow-sorted chromosomes of human and grey squirrel (sciurus carolinensis), the whole genome homologies between human and representatives of tree squirrels (sciurus carolinensis, callosciurus erythraeus), flying squirrels (petaurista albiventer) and chipmunks (tamias sibiricus) have been defined by cross-species chromosome painting. the results show that, unlike the highly rearranged karyotypes of mouse and rat, the karyotypes ... | 2004 | 15241012 |
| 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 |
| helminth fauna of the siberian chipmunk, tamias sibiricus laxmann (rodentia, sciuridae) introduced in suburban french forests. | the spread of an immigrant host species can be influenced both by its specific helminth parasites that come along with it and by newly acquired infections from native fauna. the siberian chipmunk, tamias sibiricus laxmann (rodentia, sciuridae), a northeastern eurasiatic ground nesting sciurid, has been introduced in france for less than three decades. thirty individuals were collected from three suburban forests in the ile-de-france region between 2002 and 2006. two intestinal nematode species d ... | 2007 | 17149601 |
| borrelia burgdorferi sensu lato in siberian chipmunks (tamias sibiricus) introduced in suburban forests in france. | numerous vertebrate reservoirs have been described for borrelia burgdorferi sensu lato (sl), which includes the etiological agents of lyme borreliosis (lb). the siberian chipmunk (tamias sibiricus) is a rodent originating from asia, where it is suspected to be a b. burgdorferi reservoir. it has been intentionally released into the wild in europe since the 1970s, but has not yet been subject to any study regarding its association with the lb agent. in this paper we studied siberian chipmunk infes ... | 2007 | 18021026 |
| [fleas community in introduced siberian chipmunks (tamias sibiricus laxmann) in forest of sénart, france]. | we examined the fleas community in an introduced population of siberian chipmunks, tamias sibiricus, between 2005 and 2007, in the forest of sénart (essonne, france). we collected and identified 383 fleas on 463 chipmunks (total: 1,891 captures on 471 chipmunks). in 2005, 120 fleas were also collected on 65 bank voles, clethrionomys glareolus, and on 25 wood mice, apodemus sylvaticus, trapped within the same area. ceratophyllus sciurorum sciurorum formed 73.6% of the chipmunks' flea community, w ... | 2008 | 18416245 |
| [enderleinellus tamiasis fahrenholz, 1916 (anoplura: enderleinellidae), an introduced species, and a new sucking louse for the french fauna]. | a new sucking louse is recorded for the french anopluran fauna, enderleinellus tomiasis found on the introduced sciurid tamias sibiricus. this observation highlights the maintenance of parasites when introduced with their hosts and when their hosts settle into a novel environments. it suggests a common origin for two out of four populations of siberian chipmunks examined. the authors describe the morphological criteria that allow the distinction between the two species of enderleinellus and each ... | 2008 | 18642512 |
| mitochondrial cytochrome b sequence variations and population structure of siberian chipmunk (tamias sibiricus) in northeastern asia and population substructure in south korea. | twenty-five chipmunk species occur in the world, of which only the siberian chipmunk, tamias sibiricus, inhabits asia. to investigate mitochondrial cytochrome b sequence variations and population structure of the siberian chipmunk in northeastern asia, we examined mitochondrial cytochrome b sequences (1140 bp) from 3 countries. analyses of 41 individuals from south korea and 33 individuals from russia and northeast china resulted in 37 haplotypes and 27 haplotypes, respectively. there were no sh ... | 2008 | 18852526 |
| why do siberian chipmunks tamias sibiricus (sciuridae) introduced in french forests acquired so few intestinal helminth species from native sympatric murids? | a lack of newly acquired species partly explains why introduced host species have poor specific parasite diversity. the intestinal helminth community from two native murid host species, wood mice apodemus sylvaticus [murinae] (n=40), bank voles clethrionomys glareolus [arvicolinae] (n=42), and an introduced sciurid, the siberian chipmunk tamias sibiricus (n=42), dominant in the rodent communities, was studied from three woody areas in the ile-de-france region. native gastrointestinal helminth fa ... | 2009 | 19050922 |
| introduced siberian chipmunks are more heavily infested by ixodid ticks than are native bank voles in a suburban forest in france. | by serving as hosts for native vectors, introduced species can surpass native hosts in their role as major reservoirs of local pathogens. during a 4-year longitudinal study, we investigated factors that affected infestation by ixodid ticks on both introduced siberian chipmunks tamias sibiricus barberi and native bank voles myodes glareolus in a suburban forest (forêt de sénart, ile-de-france). ticks were counted on adult bank voles and on adult and young chipmunks using regular monthly trapping ... | 2010 | 20406644 |
| reconstruction of karyotype evolution in core glires. i. the genome homology revealed by comparative chromosome painting. | glires represent a eutherian clade consisting of rodents and lagomorphs (hares, rabbits, and pikas). chromosome evolution of glires is known to have variable rates in different groups: from slowly evolving lagomorphs and squirrels to extremely rapidly evolving muroids. previous interordinal homology maps between slowly evolving glires were based on comparison with humans. here, we used sets of chromosome-specific probes from tamias sibiricus (sciuridae), castor fiber (castoridae) and humans to s ... | 2011 | 21559983 |
| genetic variability of anaplasma phagocytophilum in ixodes persulcatus ticks and small mammals in the asian part of russia. | abstract the specimens of 3552 questing adult ixodes persulcatus and 1698 blood/tissue samples of small mammals collected in ural, siberia, and far east of russia were assayed for the presence of anaplasma phagocytophilum by nested pcr based on the 16s rrna gene. totally, a. phagocytophilum was detected in 112 tick and 88 mammalian samples. the nucleotide sequences of the 16s rrna gene and groesl operon (1244-1295 bp) were determined for a. phagocytophilum samples from 65 ticks and 25 small mamm ... | 2011 | 21612528 |
| genetic diversity of anaplasma and ehrlichia in the asian part of russia. | totally, 2590 questing adult ixodes persulcatus ticks and 1458 small mammals from ural, siberia, and the far east as well as 53 haemaphysalis concinna, 136 haem. japonica, and 43 dermacentor silvarum ticks--exclusively adults--from the far east were examined for the presence of ehrlichia and anaplasma by nested pcr based on the 16s rrna gene. both anaplasma phagocytophilum and ehrlichia muris were found in i. persulcatus and small mammals from all the studied regions. myodes spp., microtus spp., ... | 2010 | 21771512 |
| introduced siberian chipmunks (tamias sibiricus barberi) harbor more-diverse borrelia burgdorferi sensu lato genospecies than native bank voles (myodes glareolus). | little attention has been given in scientific literature to how introduced species may act as a new host for native infectious agents and modify the epidemiology of a disease. in this study, we investigated whether an introduced species, the siberian chipmunk (tamias sibiricus barberi), was a potentially new reservoir host for borrelia burgdorferi sensu lato, the causative agent of lyme disease. first, we ascertained whether chipmunks were infected by all of the b. burgdorferi sensu lato genospe ... | 2011 | 21705536 |
| an electron microscopic analysis of the optic nerve of the eastern chipmunk (tamias sibiricus asiaticus): total fiber count and retinotopic organisation. | on the basis of light and electron microscopic observations of the cross-section, the total count of optic nerve fibers in the eastern chipmunk (tamias sibiricus asiaticus) was estimated to be 5.65 x 10(5). almost all the fibers were myelinated and only 0.9% were unmyelinated. axon diameters of myelinated fibers showed a skewed unimodal distribution ranging from 0.2 to 3.6 microns (mean, 0.83) with the peak at 0.6-0.7 microns. myelin sheath thickness positively correlated with the axon diameter. ... | 2012 | 3447344 |
| histochemical studies on the morphology of the golgi apparatus and on the distribution of hexokinase, amylophosphorylase, cholinesterases, and monoamine oxidase in the area postrema of the asiatic chipmunk, tamias sibiricus asiaticus (t. orientalis). | | 2013 | 4217540 |
| introduced siberian chipmunks (tamias sibiricus barberi) contribute more to lyme borreliosis risk than native reservoir rodents. | the variation of the composition in species of host communities can modify the risk of disease transmission. in particular, the introduction of a new host species can increase health threats by adding a new reservoir and/or by amplifying the circulation of either exotic or native pathogens. lyme borreliosis is a multi-host vector-borne disease caused by bacteria belonging to the borrelia burgdorferi sensu lato complex. it is transmitted by the bite of hard ticks, especially ixodes ricinus in eur ... | 2013 | 23383170 |
| genetic variability of anaplasma phagocytophilum in ticks and voles from ixodes persulcatus/ixodes trianguliceps sympatric areas from western siberia, russia. | anaplasma phagocytophilum is a causative agent of granulocytic anaplasmosis in different mammals. the presence of a. phagocytophilum was assayed in ixodes persulcatus, ixodes trianguliceps ticks and myodes spp. voles from two i. persulcatus/i. trianguliceps sympatric areas in the omsk region (western siberia, russia). in total, a. phagocytophilum was found in 42/108 (38.9%) of vole blood samples, 13/34 (38.2%) of i. trianguliceps ticks removed from voles, 1/12 (8.3%) of i. persulcatus removed fr ... | 2014 | 25113979 |
| infection of siberian chipmunks (tamias sibiricus barberi) with borrelia sp. reveals a low reservoir competence under experimental conditions. | reservoir competence is a key parameter in understanding the role of host species in the epidemiology of multi-host-especially vector-borne-pathogens. with this aim in view, we studied the reservoir competence of the siberian chipmunk (tamias sibiricus barberi) recently introduced into europe, for the multi-host tick-borne bacteria, borrelia burgdorferi sl, the agent of lyme borreliosis. t. sibiricus were experimentally exposed to bites from ixodes ricinus ticks infected with borrelia burgdorfer ... | 2015 | 25805623 |
| mapping human risk of infection with borrelia burgdorferi sensu lato, the agent of lyme borreliosis, in a periurban forest in france. | lyme borreliosis is a major zoonosis in europe, with estimates of over 26,000 cases per year in france alone. the etiological agents are spirochete bacteria that belong to the borrelia burgdorferi sensu lato (s. l.) complex and are transmitted by hard ticks among a large range of vertebrate hosts. in europe, the tick ixodes ricinus is the main vector. in the absence of a vaccine and given the current difficulties to diagnose and treat chronic lyme syndromes, there is urgent need for prevention. ... | 2016 | 26897396 |
| survey of hymenolepis spp. in pet rodents in italy. | we carried out the first survey of hymenolepis spp. infection in pet rodents in italy. fresh fecal samples were collected from 172 pet rodents as follows: guinea pigs (cavia porcellus; n = 60), squirrels (callosciurus finlaysonii, callosciurus prevosti, tamias striatus, tamias sibiricus, sciurus calorinensis; n = 52), hamsters (phodopus campbelli, mesocricetus auratus; n = 30), chinchillas (chinchilla lanigera; n = 13), rats (rattus norvegicus; n = 10), and mice (mus minutoides; n = 7). these an ... | 2015 | 26290218 |
| genetic identification of prey species from teeth in faeces from the endangered leopard cat prionailurus bengalensis using mitochondrial cytochrome b gene sequence. | to understand the dietary ecology of the leopard cat (prionailurus bengalensis), dna analysis was performed to identify prey species using dna isolated from teeth harvested from the faeces of this feline species. from 70 dna samples, a total of 52 mitochondrial dna (mtdna) cytochrome b (cytb) gene sequences of mammals were identified. the results of a sequence identity test indicated that those sequences were derived from four rodent species (apodemus agrarius, apodemus peninsulae, eothenomys re ... | 2017 | 28093009 |
| seed trait-mediated selection by rodents affects mutualistic interactions and seedling recruitment of co-occurring tree species. | as mutualists, seed dispersers may significantly affect mutualistic interactions and seedling recruitment of sympatric plants that share similar seed dispersers, but studies are rare. here, we compared seed dispersal fitness in two co-occurring plant species (armeniaca sibirica and amygdalus davidiana) that inhabit warm temperate deciduous forest in northern china. we tested the hypothesis that seed trait-mediated selection by rodents may influence mutualistic interactions with rodents and then ... | 2016 | 26546082 |
| reconsidering the effects of tannin on seed dispersal by rodents: evidence from enclosure and field experiments with artificial seeds. | the question of how tannin affects feeding and hoarding preferences of rodents still remains poorly understood, in part, because it is difficult to control for other seed traits when considering the sole effect of tannin. here, we constructed a series of artificial 'seeds' with different tannin levels, made from wheat flour, peanut powder and hydrolysable tannins, to determine the direct effects of tannin on both feeding and hoarding preferences. we first presented 'seeds' to individual rodents ... | 2013 | 24161819 |
| seed caching and cache pilferage by three rodent species in a temperate forest in the xiaoxinganling mountains. | although differences in food-hoarding tactics both reflect a behavioral response to cache pilferage among rodent species and may help explain their coexistence, differentiation in cache pilfering abilities among sympatric rodents with different hoarding strategies is seldom addressed. we carried out semi-natural enclosure experiments to investigate seed hoarding tactics among three sympatric rodent species (tamias sibiricus, apodemus peninsulae and clethrionomys rufocanus) and the relationship o ... | 2013 | 23389982 |
| ipsilaterally projecting retinal ganglion cells in the eastern chipmunk (tamias sibiricus asiaticus). | ipsilaterally projecting ganglion cells were studied in whole-mounted retinas of the eastern chipmunk (tamias sibiricus asiaticus) by labelling these cells with horseradish peroxidase (hrp) injected into the optic tract. the hrp-labelled cells were distributed exclusively in the temporal crescent which occupied about a quarter of the whole retinal area. the temporal crescent contained contralaterally projecting cells as well as ipsilaterally projecting cells. the soma size of ipsilaterally proje ... | 1985 | 4000548 |
| infection of ixodes ricinus by borrelia burgdorferi sensu lato in peri-urban forests of france. | lyme borreliosis is the most common tick-borne disease in the northern hemisphere. in europe, it is transmitted by ixodes ticks that carry bacteria belonging to the borrelia burgdorferi sensu lato complex. the objective of this work was to explore eco-epidemiological factors of lyme borreliosis in peri-urban forests of france (sénart, notre-dame and rambouillet). we investigated whether the introduction of tamias sibiricus in sénart could alter the density of infected ticks. moreover, the densit ... | 2017 | 28846709 |
| do native rodents prey on land snails? an experimental and quantitative study in hokkaido, japan. | predator-prey interaction is one of the most important and pervasive pressures in the ecology and evolution of prey species. however, accurate description of the food web is sometimes extremely difficult as there are many predator-prey interactions in the wild are obscure. recent studies have reported that two closely related land snails, karaftohelix editha and k. gainesi, on hokkaido island, japan, were diversified due to predation, probably by carabid beetles. however, it is unclear 1) whethe ... | 2017 | 28770674 |
| visual landmark-directed scatter-hoarding of siberian chipmunks tamias sibiricus. | spatial memory of cached food items plays an important role in cache recovery by scatter-hoarding animals. however, whether scatter-hoarding animals intentionally select cache sites with respect to visual landmarks in the environment and then rely on them to recover their cached seeds for later use has not been extensively explored. furthermore, there is a lack of evidence on whether there are sex differences in visual landmark-based food-hoarding behaviors in small rodents even though male and ... | 2016 | 27160702 |
| inter-annual and inter-individual variations in survival exhibit strong seasonality in a hibernating rodent. | most research on the demography of wild animal populations has focused on characterizing the variation in the mortality of organisms as a function of intrinsic and environmental characteristics. however, such variation in mortality is difficult to relate to functional life history components (e.g. reproduction, dispersal, hibernation) due to the difficulty in monitoring biological processes at a sufficiently fine timescale. in this study, we used a 10-year individual-based data set with an infra ... | 2016 | 26969470 |
| seasonal variation in infestations by ixodids on siberian chipmunks: effects of host age, sex, and birth season. | in mammalian hosts, macroparasite aggregation is highly heterogeneous over space and time and among individuals. while the exact causes of this heterogeneity remain unclear, it has mainly been attributed to individual differences in exposure and susceptibility. although some extrinsic (e.g., parasite availability) and intrinsic (e.g., sex or age) factors are well known to affect infestation patterns, the joint and possibly interacting effects of these factors are poorly understood. here, we stud ... | 2015 | 25724565 |
| incorporating cache management behavior into seed dispersal: the effect of pericarp removal on acorn germination. | selecting seeds for long-term storage is a key factor for food hoarding animals. siberian chipmunks (tamias sibiricus) remove the pericarp and scatter hoard sound acorns of quercus mongolica over those that are insect-infested to maximize returns from caches. we have no knowledge of whether these chipmunks remove the pericarp from acorns of other species of oaks and if this behavior benefits seedling establishment. in this study, we tested whether siberian chipmunks engage in this behavior with ... | 2014 | 24647670 |
| scatter hoarding and hippocampal cell proliferation in siberian chipmunks. | food hoarding, especially scatter hoarding and retrieving food caches, requires spatial learning and memory and is an adaptive behavior important for an animal's survival and reproductive success. in the present study, we examined the effects of hoarding behavior on cell proliferation and survival in the hippocampus of male and female siberian chipmunks (tamias sibiricus). we found that chipmunks in a semi-natural enclosure displayed hoarding behavior with large individual variations. males ate ... | 2013 | 24121131 |
| turning the corner in quadrupedal arboreal locomotion: kinetics of changing direction while running in the siberian chipmunk (tamias sibiricus). | arboreal animals frequently change directions during locomotion on tree branches, trunks, or twigs. linear and rotational impulses required to change direction and rotate the body while running are largely unexplored. we trained siberian chipmunks (tamias sibiricus) to run on narrow cylindrical trackways. the first trackway was straight and the second had a 45° bend to the right. a force pole collected substrate reaction forces and torques, and linear and rotational impulses were calculated. whe ... | 2013 | 23213038 |
| torque around the center of mass: dynamic stability during quadrupedal arboreal locomotion in the siberian chipmunk (tamias sibiricus). | when animals travel on tree branches, avoiding falls is of paramount importance. animals swiftly running on a narrow branch must rely on movement to create stability rather than on static methods. we examined how siberian chipmunks (tamias sibiricus) remain stable while running on a narrow tree branch trackway. we examined the pitch, yaw, and rolling torques around the center of mass, and hypothesized that within a stride, any angular impulse (torque during step time) acting on the center of mas ... | 2011 | 21429722 |
| concordant genetic distinctness of the phylogroup of the siberian chipmunk from the korean peninsula (tamias sibiricus barberi), reexamined with nuclear dna c-myc gene exon 2 and mtdna control region sequences. | we reexamined tamias sibiricus barberi from korea by sequencing c-myc exon 2 and the mtdna control region. in the c-myc exon, the monogenic t. s. barberi differed from the monogenic t. s. orientalis (nucleotide distance 0.48%; 3 variable sites at 168, 306, and 552), whereas t. s. orientalis was identical to t. s. sibiricus. in the control region, t. s. barberi differed from t. s. orientalis (distance 6.84%) and t. s. sibiricus (9.35%). we considered the concordant, extensive gaps between the phy ... | 2010 | 20526736 |
| personality, space use and tick load in an introduced population of siberian chipmunks tamias sibiricus. | 1. although behaviours can contribute to the heterogeneity in parasite load among hosts, links between consistent individual differences in behaviour and parasitic infection have received little attention. we investigated the role of host activity and exploration on hard tick infestations of marked individuals in a population of siberian chipmunks tamias sibiricus introduced in a suburban french forest over 3 years. 2. individual activity-exploration profiles were assessed from 106 hole-board te ... | 2010 | 20202009 |
| mammary adenocarcinoma in a chipmunk (tamias sibiricus). | an 8-year-old, female chipmunk (tamias sibiricus), which had been kept as a pet, was presented with a chief complaint of the gradually enlarging mammary mass and dysuria. the mammary mass was surgically excised and was histopathologically diagnosed as mammary adenocarcinoma. despite a general improvement in its condition and reduced dysuria after surgery, the chipmunk died on postoperative day 188. pathological examination revealed that the mammary tumor had metastasized to both the lungs and th ... | 2009 | 19498300 |
| a phylogroup of the siberian chipmunk from korea (tamias sibiricus barberi) revealed from the mitochondrial dna cytochrome b gene. | in the full sequences of the mtdna cytochrome b gene, 26 haplotypes (tamias sibiricus barberi) from six localities of central and southern korea were distinct from 21 haplotypes (tamias sibiricus orientalis) from five localities of northeast china and vladivostok, russia. the average tamura-nei nucleotide distance between the subspecies (11.40%) and maximum infrasubspecific distances (3.74% and 4.72%) support the subspecies classification of t. s. barberi based on morphometric comparison. the 26 ... | 2009 | 19039659 |
| [molecular genetic relationships among east palearctic ground squirrels of the genus spermophilus (sciuridae, rodentia)]. | genetic diversity in the four east palearctic ground squirrel species of the genus spermophilus--s. undulatus, s. parryi (subgenus urocitellus), s. dauricus, and s. relictus (subgenus citellus)--- was investigated using rapd pcr with ten random primers. siberian chipmunk, tamias sibiricus, was used as an outgroup. molecular markers for different taxonomic ranks were identified, including those for the genera spermophilus and tamias, subgenera urocitellus and citellus, as well as for each of the ... | 2008 | 18825960 |
| tail root osteosarcoma in a chipmunk (tamias sibiricus). | an 8-year-old chipmunk (tamias sibiricus) showed a mass on the tail root. histologically, the excised mass showed proliferation of spindle-to-polyhedral cells and abundant multinucleated giant cells, with the production of neoplastic osteoid. immunohistochemically, neoplastic cells were positive for vimentin and weakly positive for osteocalcin. osteoid was also positive for osteocalcin. this tumor was diagnosed as a giant cell-type osteosarcoma. this is the first case report of osteosarcoma in a ... | 2007 | 17491085 |
| high fos expression during the active phase in orexin neurons of a diurnal rodent, tamias sibiricus barberi. | to investigate whether a diurnal animal possesses the orexinergic system implicating vigilance and behavior, we examined fos immunoreactivity (ir) in orexinergic neurons of korean chipmunks raised under 12h light-dark cycles. brain tissue, collected at four different zeitgeber times (zt), was double-labeled with fos and orexin-a antibodies. there was no difference in the number of orexin-ir neurons in the hypothalamus across all zts. however, more orexin-ir neurons expressing fos-ir were found a ... | 2005 | 15752578 |
| glycoconjugates of the gastric mucosa in cold-treated chipmunks. | during seasonal hibernation, there is reduced gastrointestinal activity, but relatively little is known of the physiology involved. in the present experimental study, male korean chipmunks (tamias sibiricus barberi) were maintained in cold conditions (6 degrees c) for 3, 5 or 9 months to mimic conditions occurring during seasonal hibernation. changes in the composition of glycoconjugates (gcs) of the gastric mucosa were determined after cold-treatment. cold-treated chipmunks, in comparison with ... | 2003 | 14656004 |
| seasonal variation in levels of prostaglandins d2, e2 and f2(alpha) in the brain of a mammalian hibernator, the asian chipmunk. | seasonal changes in the in vivo levels of the prostaglandins (pgs) pgd2, pge2, and pgf2(alpha) were measured in the brain of the male asian chipmunk, tamias asiaticus (n = 111), which underwent hibernation during the period between november and march. the mean level of pgd2 ranged from 36.0 to 85.2 pg/g tissue from june to october and remained essentially unchanged (80.5 pg/g tissue) in december. however, the mean pgd2 level rose significantly to 128.6 pg/g tissue in february, and returned to 75 ... | 1996 | 8992498 |
| scanning electron microscopic study on the lingual papillae in the manchurian chipmunk, tamias sibiricus asiaticus. | the superfacial structures of the tongues in the manchurian chipmunk, tamias sibiricus asiaticus, were observed by scanning electron microscope. the tongues were long, tapering, narrow and thick with a long apical free portion and a small lingual prominence in the posterior half. in this animal, three circumvallate papillae were present in an inverted triangle, a minority of conical papillae on the pharyngeal part and parallel large conical papillae on the lateral border. the fungiform papillae ... | 1992 | 1436951 |
| retinal inputs to the geniculate relay cells in the eastern chipmunk (tamias sibiricus asiaticus): a comparison between color and non-color sensitive cells. | single unit recordings were made from the relay cells of the lateral geniculate nucleus in the eastern chipmunk. of 362 relay cells, 47 cells (13%) were classified as color sensitive and the rest as non-color sensitive cells. non-color sensitive cells were further classified into 5 subclasses: off-phasic, on-phasic, on-off-phasic, on-tonic and uncommon types. within the color sensitive cells there were 3 subclasses; blue excited and green inhibited (+b-g), blue inhibited and green excited (-b+g) ... | 1987 | 3567568 |
| light and electron microscopic evidence for a direct retinal projection to the pulvinar in the asiatic chipmunk, tamias sibricus. | | 1986 | 3010208 |
| distribution and soma size of ganglion cells in the retina of the eastern chipmunk (tamias sibiricus asiaticus). | topographic distribution and soma size of ganglion cells were studied in nissl-stained, whole-mounted retinas of the eastern chipmunk. high density areas in the central retina were elongated horizontally, making up the visual streak. the total count of ganglion cells was estimated as 410,000. throughout the retina soma size of ganglion cells showed a uimodal distribution, although a distinct population of large cells was found in the dorso-temporal periphery. | 1985 | 4049737 |
| influence of vegetation area and edge length on mammals in urban woods. | we investigated the relationships between vegetation area, edge length, and mammals in the urban woods of daejeon metropolitan city, south korea. the vegetation patches included in this study varied from 2.1 to 501.0 ha in size. surveys were conducted monthly between february and october 2015, with a survey route measuring 1 km in length and 10 m width established in each forest patch. field signs of 14 species of mammals were recorded in the 33 chosen forest patches over the course of the study ... | 2017 | 30460081 |
| british red squirrels remain the only known wild rodent host for leprosy bacilli. | eurasian red squirrels (sciurus vulgaris) in the british isles are the most recently discovered animal reservoir for the leprosy bacteria mycobacterium leprae and mycobacterium lepromatosis. initial data suggest that prevalence of leprosy infection is variable and often low in different squirrel populations. nothing is known about the presence of leprosy bacilli in other wild squirrel species despite two others (siberian chipmunk [tamias sibiricus], and thirteen-lined ground squirrel [ictidomys ... | 2019 | 30775369 |
| differently sized cuckoos pose different threats to hosts. | hole-nesting tits parus spp. have been classified as "unsuitable" hosts for cuckoo parasitism because cuckoos cannot enter a cavity if the entrance is too small. however, chinese tits could reject alien eggs and egg ejection rate increased with the local diversity of parasitic cuckoo species. antiparasitic behavior among chinese tits may have evolved due to greater size variation among sympatric cuckoo species. this raises the question of whether differently sized parasitic cuckoos pose differen ... | 2020 | 32440285 |
| exclusion of interspecific competition reduces scatter-hoarding of siberian chipmunk tamias sibiricus: a field study. | although food availability and the abundance of seed predators have been postulated to affect seed dispersal, it is not clear how seed-eating animals modify their scatter-hoarding strategies in response to different levels of interspecific competition. we placed paired germinated and ungerminated acorns of quercus mongolica on 30-cm high platforms to exclude potential interspecific competition of the predominant larder hoarders apodemus peninsulae and myodes rufocanus, to investigate seed disper ... | 2020 | 31631518 |
| visual and auditory cues facilitate cache pilferage of siberian chipmunks (tamias sibiricus) under indoor conditions. | in the struggle for survival, scatter-hoarding rodents are known to cache food and pilfer the caches of others. the extent to which rodents utilize auditory/visual cues from conspecifics to improve cache-pilfering is unknown. here, siberian chipmunks (tamias sibiricus) were allowed to search for caches of corylus heterophylla seeds (man-made caches and animal-made caches) after experiencing cues from a conspecific's cache-searching events. for each type of cache, 3 experimental scenarios were pr ... | 2019 | 30585411 |
| within- and between-year variations of reproductive strategy and cost in a population of siberian chipmunks. | reproduction costs depend on the general life-history strategies employed by organisms for resource acquisition, the decision rules on resource allocation, and the resource availability. although the predictability of resource availability is expected to influence the breeding strategy, the relationship between predictability and strategy has rarely been investigated at the population level. one reason is that, while the resource availability is commonly variable in space and time, their predict ... | 2018 | 30219947 |
| selective predation on acorn weevils by seed-caching siberian chipmunk tamias sibiricus in a tripartite interaction. | although food-hoarding animals benefit plant seeds by generating predation pressure on granivorous insects, we lack experimental evidence of whether the tripartite interactions maintain a mutualistic relationship between the third trophic level and primary producers. relying on the behavior of shelling, siberian chipmunks (tamias sibiricus) selectively consumed weevil larvae infested in acorns of mongolian oak (quercus mongolica) but chose the non-infested acorns to scatter-hoard. shelling not o ... | 2018 | 29777342 |
| effects of tannins on population dynamics of sympatric seed-eating rodents: the potential role of gut tannin-degrading bacteria. | chemical compounds in seeds exert negative and even lethal effects on seed-consuming animals. tannin-degrading bacteria in the guts of small mammals have been associated with the ability to digest seeds high in tannins. at the population level, it is not known if tannins influence rodent species differently according to the composition of their gut microbiota. here, we test the hypothesis that sympatric tree species with different tannins exert contrasting effects on population fluctuations of s ... | 2018 | 29736862 |
| complete mitochondrial genome of a chipmunk species, tamias sibiricus (rodentia: sciuridae) in korea. | we sequenced the complete mitochondrial genome (kf668525) of tamias sibiricus in south korea. the mitogenome of the korean chipmunk t. sibiricus was 16,558 bp long with base composition of 33.8% a, 31.1% t, 22.9% c and 12.2% g. total nucleotide similarity of t. sibiricus and marmota himalayana (jx069958) genomes was 80.4% ranging from 66.9% (d-loop region) to 97.3% (trna(leu)((cun))). the present study will contribute to understanding taxonomic status and genetic divergence of northeast asian t. ... | 2015 | 24228685 |
| the complete mitochondrial genome of ictidomys tridecemlineatus (rodentia: sciuridae). | the complete mitochondrial genome of the thirteen-lined ground squirrel, ictidomys tridecemlineatus (rodentia: sciuridae) was sequenced to analyze the gene arrangement. it is a circular molecule of 16,458 bp in length including 37 genes typically found in other squirrels. the at content of the overall base composition is 63.7% and the length of the control region is 1016 bp with 63.0% at content. in bi and ml phylogenetic trees, i. tridecemlineatus is a sister clade to the genus cynomys, and tam ... | 2016 | 26024127 |
| hantaan virus surveillance targeting small mammals at nightmare range, a high elevation military training area, gyeonggi province, republic of korea. | rodent-borne disease surveillance was conducted at nightmare range (nm-r), near the demilitarized zone in northeast gyeonggi province, republic of korea, to identify hemorrhagic fever with renal syndrome (hfrs) risks for a mountainous high-elevation (500 m) military training site. monthly surveys were conducted from january 2008-december 2009. a total of 1,720 small mammals were captured belonging to the orders rodentia [families, sciuridae (1 species) and muridae (7 species)] and soricomorpha [ ... | 2015 | 25874643 |