| flea reinfestation on the california meadow vole (microtus californicus). | | 1975 | 1123837 |
| uptake of environmental contaminants by small mammals in pickleweed habitats at san francisco bay, california. | small mammals were live-trapped in pickleweed (salicornia virginica) habitats near san francisco bay, california in order to measure the uptake of several contaminants and to evaluate the potential effects of these contaminants on the endangered salt marsh harvest mouse (reithrodontomys raviventris). tissues of house mice (mus musculus), deer mice (peromyscus maniculatus), and california voles (microtus californicus) from nine sites were analyzed for chemical contaminants including mercury, sele ... | 1992 | 1586203 |
| isolation and partial characterization of an orthopoxvirus from a california vole (microtus californicus). brief report. | a virus with the characteristics of an orthopox was isolated from a scab removed from the foot of a california vole. hai antibody surveys indicated that the virus in enzootic in several different vole populations. | 1987 | 3034201 |
| selenium accumulation in mammals exposed to contaminated california irrigation drainwater. | in may 1984, 332 mammals of 10 species were collected at kesterson reservoir (san joaquin valley, merced co., ca), which had received selenium-laden irrigation drainwater, and at the nearby volta wildlife area, which had not. the study concentrated on the california vole (microtus californicus); 88 were taken at kesterson, 89 at volta. mean selenium concentrations in livers were as much as 522 times higher at kesterson. there were species-to-species differences at kesterson; higher selenium conc ... | 1987 | 3685946 |
| the effect of flea control on yersinia (pasteurella) pestis antibody rates in the california vole, microtus californicus, and its epizootiological implications. | the effects of flea control on the prevalence of (pasteurella) pestis antibody rates in the california vole, microtus californicus, were studied in san mateo county, california, usa. in this area, which had shown antibody prevalence rates of 50% or more during epizootics in previous years, continuous flea control measures reduced the antibody rate to virtually zero and held it at that level for 12 months, although a nearby area showed an incidence of 40-80% seropositive voles for 5 months during ... | 1971 | 5316910 |
| influence of photoperiod, nutrition and water availability on reproduction of male california voles (microtus californicus). | male california voles were maintained in long (14l:10d) or short photoperiods (10l:14d) for 10 weeks and fed a standard diet of rabbit chow and water ad libitum. one additional group in each photoperiod received the standard diet plus supplements of spinach 3 times weekly. a fifth group was housed in 14l:10d and fed the standard diet, but for 10 weeks water availability was restricted to several hours each morning. testes and seminal vesicles were heaviest in long-day voles fed spinach supplemen ... | 1983 | 6355461 |
| short report: prevalence of hantavirus infection in rodents associated with two fatal human infections in california. | rodents living near two fatal human cases of hantavirus pulmonary syndrome in california were surveyed for evidence of hantavirus infection. seventeen (15%) (14 peromyscus maniculatus and one each of p. truei, eutamias minimus, and microtus californicus) of 114 rodents tested had evidence (enzyme-linked immunosorbent assay or polymerase chain reaction) of hantavirus infection. this suggests that peromyscus mice, and p. maniculatus in particular, may be the reservoir for the virus causing this ne ... | 1995 | 7872450 |
| isla vista virus: a genetically novel hantavirus of the california vole microtus californicus. | prospect hill virus (ph) was isolated from a meadow vole (microtus pennsylvanicus) in 1982, and much of its genome has been sequenced. hantaviruses of other new world microtine rodents have not been genetically characterized. we show that another microtus species (the california vole m. californicus) from the united states is host to a genetically distinct ph-like hantavirus, isla vista virus (ilv). the nucleocapsid protein of ilv differs from that of ph by 11.1% and a portion of the g2 glycopro ... | 1995 | 8847529 |
| role of small mammals in the ecology of borrelia burgdorferi in a peri-urban park in north coastal california. | the role of small mammals other than woodrats in the enzootiology of the lyme disease spirochete, borrelia burgorferi, was assessed in the peri-urban park. mammals were collected monthly from september through to april. following tick removal, the animals were tested for b. burgdorferi by culture of ear-punch biopsies. larvae and nymphs that were intermediate in morphology between ixodes spinipalpis and ixodes neotomae occurred on several species of rodents (peromyscus truei, peromyscus californ ... | 1997 | 9291589 |
| hantavirus (bunyaviridae) infections in rodents from orange and san diego counties, california. | during a screening program to determine the extent of hantavirus activity in orange and san diego counties, california, serum samples from 2,365 rodents representing nine genera and 15 species were tested for hantavirus antibodies. a reverse transcription-polymerase chain reaction on selected seropositive rodents was used to identify the specific hantavirus. rodents positive for sin nombre virus (snv) antibodies by western blot included 86 (9.1%) of 948 deer mice (peromyscus maniculatus), four ( ... | 1999 | 9988327 |
| pneumocystosis in wild small mammals from california. | cyst forms of the opportunistic fungal parasite pneumocystis carinii were found in the lungs of 34% of the desert shrew, notiosorex crawfordi (n = 59), 13% of the ornate shrew, sorex ornatus (n = 55), 6% of the dusky-footed wood rat, neotoma fuscipes (n = 16), 2.5% of the california meadow vole, microtus californicus (n = 40), and 50% of the california pocket mouse, chaetodipus californicus (n = 2) caught from southern california between february 1998 and february 2000. cysts were not found in a ... | 2001 | 11310900 |
| serum antibody responses in a population of microtus californicus and associated rodent species during and after pasteurella pestis epizootics in the san francisco bay area. | | 1964 | 14270072 |
| the detection of inapparent infections with pasteurella pestis in a microtus californicus population in the san francisco bay area. | | 1964 | 14270073 |
| detection and characterization of borrelia bissettii in rodents from the central california coast. | this is the first report of borrelia burgdorferi sensu lato in rodents from san luis obispo county, with most isolates obtained from a previously unreported host, neotoma lepida thomas. b. burgdorferi sensu lato was identified in seven rodent species, including the california vole, microtus californicus peale; dusky-footed woodrat, neotoma fuscipes baird; desert woodrat, neotoma lepida thomas; brush mouse, peromyscus boylii baird; california mouse, peromyscus californicus gambel; deer mouse, per ... | 2004 | 15311469 |
| ectoparasite diversity and exposure to vector-borne disease agents in wild rodents in central coastal california. | a survey of wild rodents was performed in the morro bay area of central coastal california to determine serological and polymerase chain reaction (pcr) prevalence of anaplasma phagocytophilum dumler, barbet, bekker, dasch, palmer, ray, rikihisa, and rurangirwa, borrelia burgdorferi johnson, schmidt, hyde, steigerwalt, and brenner, francisella tularensis mccoy, and yersinia pestis yersin; to describe the ectoparasitic fauna on important vector-borne disease hosts; and to determine whether pathoge ... | 2007 | 17427705 |
| modeling susceptible infective recovered dynamics and plague persistence in california rodent-flea communities. | plague persists as an enzootic in several very different rodent-flea communities around the world. in california, a diversity of rodent-flea communities maintains the disease, and a single-host reservoir seems unlikely. logistic regression of plague presence on climate and topographic variables predicts plague in many localities where it is absent. thus, a dynamic community-based analysis was needed. deterministic susceptible infective recovered (sir) models were adapted for plague and analyzed ... | 2010 | 20158333 |
| an ixodes minor and borrelia carolinensis enzootic cycle involving a critically endangered mojave desert rodent. | microtus californicus scirpensis is an endangered, isolated subspecies of california vole. it requires water pools and riparian bulrush (schoenoplectus americanus) and occupies some of the rarest habitat of any north american mammal. the minimally vegetated, extremely arid desert surrounding the pools is essentially uninhabitable for ixodes species ticks. we describe an enzootic cycle of borrelia carolinensis in ixodes minor ticks at a site 3500 km distant from the region in which i. minor is kn ... | 2014 | 25035799 |
| pathogen infection and exposure, and ectoparasites of the federally endangered amargosa vole (microtus californicus scirpensis), california, usa. | abstract we surveyed pathogens and ectoparasites among federally endangered amargosa voles (microtus californicus scirpensis) and sympatric rodents in tecopa hot springs, inyo county, california, december 2011-november 2012. we aimed to assess disease and detect possible spillover from or connectivity with other hosts within and outside the amargosa ecosystem. we assessed 71 individual voles and 38 individual sympatric rodents for current infection with seven vector-borne zoonotic pathogens and ... | 2014 | 25121407 |
| ectoparasites of microtus californicus and possible emergence of an exotic ixodes species tick in california. | california voles (microtus californicus peale) harbor fleas and ticks, may be infected with vector-borne pathogens, and could themselves suffer from disease and serve as a source of infection for people and other animals. here we summarize publications, museum archives, and recent records of ticks and fleas from california voles. there have been 18 flea species reported on california voles with geographic locations reported for 13. during recent statewide surveys, we found six flea species, with ... | 2015 | 26336217 |
| prevalence and potential impact of toxoplasma gondii on the endangered amargosa vole (microtus californicus scirpensis), california, usa. | we investigated the prevalence of toxoplasma gondii in 2011-15 to assess its potential threat on the endangered amargosa vole ( microtus californicus scirpensis) in california, us. surveillance was simultaneously performed on populations of syntopic rodent species. we detected antibodies to t. gondii in sera from 10.5% of 135 wild-caught amargosa voles; 8% of 95 blood samples were pcr-positive for the t. gondii b1 gene, and 5.0% of 140 sympatric rodent brain samples were pcr-positive. exposure t ... | 2017 | 27690194 |
| the pox in the north american backyard: volepox virus pathogenesis in california mice (peromyscus californicus). | volepox virus (vpxv) was first isolated in 1985 from a hind foot scab of an otherwise healthy california vole (microtus californicus). subsequent surveys in san mateo county, ca, revealed serological evidence suggesting that vpxv is endemic to this area, and a second viral isolate from a pinyon mouse (peromyscus truei) was collected in 1988. since then, few studies have been conducted regarding the ecology, pathology, and pathogenicity of vpxv, and its prevalence and role as a potential zoonotic ... | 2012 | 22952799 |
| effect of an invasive plant and moonlight on rodent foraging behavior in a coastal dune ecosystem. | understanding how invasive plants may alter predator avoidance behaviors is important for granivorous rodents because their foraging can trigger ripple effects in trophic webs. previous research has shown that european beach grass ammophila arenaria, an invasive species in coastal california, affects the predation of other seeds by the rodents microtus californicus, peromyscus maniculatus, and reithrodontomys megalotis. this may be due to lower perceived predation risk by rodents foraging in clo ... | 2015 | 25679785 |
| the effect of rodent seed predation on four species of california annual grasses. | the effect of seed predation by microtus californicus and mus musculus on plant numbers of four species of california annual grasses was investigated for one year period on a grassland near davis, california. in winter, mice utilized dead star thistle plants for cover when grasses in open areas were short, but moved into open areas when grass grew tall in spring.using exclosures and plots sown with known quantities of seed, it was estimated that a mouse population (approximate density 120/acre) ... | 1978 | 28309269 |
| reingestion of feces in rodents and its daily rhythmicity. | the ingestion of feces is widespread among rodent species and is an extensively employed component of the repertoire of feeding behaviors in some species. coprophagy is thus a significant consideration in the nutrition and dietary ecology of many rodents. as certain fecal pellets pass from the anus, they are taken up directly into the mouth, chewed, and swallowed. the nocturnally active herbivorous kangaroo rat dipodomys microps ingests about 1/4 of the feces it produces daily and the daily patt ... | 1979 | 28310297 |
| modifications of a cholinesterase method for determination of erythrocyte cholinesterase activity in wild mammals. | a method to determine erythrocyte cholinesterase (che) activity was modified for use in wild mammals. erythrocyte che of california voles (microtus californicus) was primarily acetylcholinesterase (ache), which was similar to the brain and unlike plasma which was primarily butyrylcholinesterase (bche). triplicate erythrocyte ache analyses from individual animals of several species of wild rodents revealed a mean coefficient of variation of 8.7% (sd = 4.3%). erythrocyte che activity of several wi ... | 1994 | 8028108 |
| ameloblastoma of the jaw in three species of rodent: a domestic brown rat (rattus norvegicus), syrian hamster (mesocricetus auratus) and amargosa vole (microtus californicus scirpensis). | ameloblastoma is a locally aggressive tumour derived from the odontogenic epithelium of the developing tooth germ. this uncommon odontogenic tumour is generally considered benign, but rarely, both distant metastasis and cytological atypia occur and this malignant version is referred to as malignant ameloblastic carcinoma. here we document a spontaneous malignant ameloblastic carcinoma in a rat (rattus norvegicus) with metastasis to the submandibular lymph node. we also describe ameloblastomas in ... | 2017 | 28942297 |
| histopathology and risk factors associated with neotrombicula microti infestation in the endangered amargosa vole (microtus californicus scirpensis). | the amargosa vole (microtus californicus scirpensis) is a profoundly endangered rodent found only in the central mojave desert, inyo county, california, us. in 2010, severe cases of trombiculiasis, caused by larval neotrombicula microti mites, were discovered among voles and sympatric small mammals. we evaluated amargosa voles and sympatric rodents for infestation with n. microti december 2011-november 2012 and evaluated histopathology of ear tissue from 13 actively n. microti-infested amargosa ... | 2015 | 25919470 |
| severe ulceronecrotic dermatitis associated with mite infestation in the critically endangered amargosa vole (microtus californicus scirpensis). | the entire range of the critically endangered amargosa vole (microtus californicus scirpensis) consists of less than 20 km(2) of riparian habitat in the amargosa river drainage of the mojave desert in southern california. in september 2010, deformities on ears and chiggers on the ears and genitalia were detected, with some individuals so severely affected that they were missing ear pinnae altogether. follow-up trapping was performed to document the presence of mites and mite-associated disease, ... | 2013 | 23458565 |
| small mammals cause non-trophic effects on habitat and associated snails in a native system. | legacy effects occur when particular species or their interactions with others have long-lasting impacts, and they are increasingly recognized as important determinants of ecological processes. however, when such legacy effects have been explicitly explored, they most often involve the long-term direct effects of species on systems, as opposed to the indirect effects. here, we explore how a legacy of small mammal exclusion on the abundance of a shrub, bush lupine (lupinus arboreus), influences t ... | 2011 | 21691854 |
| sampling fleas: the reliability of host infestation data. | the use of measures of host infestation as a reliable indicator of a flea population size to be used in interspecific comparisons was considered. the abundance of fleas collected from host bodies and collected from host burrows was compared among 55 flea species, controlling for the effect of flea phylogeny. the mean number of fleas on host bodies correlated positively with the mean number of fleas in host burrows/nests both when the entire data pool was analysed and for separate subsets of data ... | 2004 | 15347390 |
| population dynamics of adult fleas (siphonaptera) on hosts and in nests of the california vole. | microtus californicus (peale, 1848) were live trapped or retrapped 887 times, and fleas were collected over a 2.5-yr period in the san francisco watershed and wildlife refuge. also, 179 m. californicus nests were collected monthly with observations to identify the environment of fleas. the ratio of the mean number of fleas per nest to the mean number collected on voles was 4.7:1 for malaraeus telchinus (rothschild, 1905), 13:1 for hystrichopsylla occidentalis linsdalei holland, 1957,9:1 for atyp ... | 2002 | 12495178 |
| using stable isotopes to assess seasonal patterns of avian predation across a terrestrial-marine landscape. | in this study, we used the stable isotope ratios 15n/14n and 13c/12c to clarify the spatial and temporal patterns of small mammal derpredation by wide-ranging raptors across a salt marsh and grassland landscape. to determine whether clear isotope signals existed for the two adjoining habitats, and if these differences could allow for an assessment of the seasonal habitat origins of depredated rodents, primarily the vole, microtus californicus, we investigated the nitrogen and carbon isotope rati ... | 2001 | 28547199 |
| life with fur and without: experimental field energetics and survival of naked meadow voles. | hair is considered to be a basic mammalian feature that provides protection and insulation, promoting energy conservation and survival. to quantify the functional significance of mammalian pelage, we tested the short-term experimental effects of fur removal in a natural population of the california vole, microtus californicus, in winter. the daily energy expenditure (dee) of seven voles was directly measured in the field using stable isotopes, first with the animals in their natural condition an ... | 2000 | 28308375 |
| effect of ectoparasite removal procedures on recapture of microtus californicus. | we tested the null hypothesis that anesthetizing meadow voles (microtus californicus) and brushing them vigorously for ectoparasites would have no effect on the later recapture of these voles. voles were trapped from 6 december 1993 to 10 january 1994 at faye slough wildlife area near eureka, humboldt county, california (usa). alternate trapped voles were anesthetized with ethyl ether and brushed vigorously for ectoparasites. there was no significant difference in the frequency of recapture nor ... | 1996 | 9359079 |
| social organization and space use in california voles: seasonal, sexual, and age-specific strategies. | we intensively monitored space use and movement in microtus californicus over a 2-year period that included 1 year of high density (maximum 618/ha) and one of low (minimum 5/ha); historically this population has exhibited cycles of 2 or 4 years. adults of both sexes dispersed at the start of the breeding season, culminating in the establishment of intrasexually exclusive territories. in females, these territories persisted throughout life, except that many young females recruiting during the bre ... | 1995 | 28306957 |
| nutritional and social cues influence the onset of puberty in california voles. | weanling male california voles were housed individually in cages containing either bedding taken from their own mothers, from unrelated mothers, or clean woodshavings. half of the males in each housing condition received fresh lettuce daily in addition to their standard diets. at 45 days of age males housed in clean bedding had heavier seminal vesicles than males housed in bedding from their own or an unrelated mother. however, males which received lettuce supplementation displayed large-sized s ... | 1986 | 3515374 |
| female reproductive development is not activated by male california voles exposed to family cues. | reproductive development of male california voles (microtus californicus) is delayed when voles are raised in bedding taken from their family. in these experiments the effects of this chemically mediated puberty delay on male reproductive potential were examined. males were paired with females for a 4-day period; the resultant uterine weights constituted a measure of male potency. in experiments 1 and 2, 45-day-old males raised in clean or family bedding were paired with females. regardless of w ... | 1985 | 3886027 |
| chemical cues from families delay puberty in male california voles. | the role of chemical cues in the delay of puberty in male california voles (microtus californicus) was investigated. males that were raised from weaning in bedding from their families were delayed in attainment of adult androgen levels and seminal vesicle weights compared to males raised in clean bedding. in a second experiment, the source of the suppressive cues was examined by rearing males in bedding from unrelated adult males, their fathers, or their mothers. males reared with bedding from t ... | 1984 | 6383487 |
| microhabitat heterogeneity and population ecology of an herbivorous rodent, microtus californicus. | existing models of microtine population regulation and life history evolution rely on data derived from empirical studies which assume spatial homogeneity of the sampling unit, and infer that population dynamics can be described adequately by aggregation of individuals differing in sex, age and social status. these assumptions were not supported in the present study, and their application would have obscured relationships of ecological and evolutionary importance. from 1975 to 1981 a population ... | 1983 | 28310230 |
| population fluctuations and extinctions of small rodents in coastal southern california. | the population dynamics of three sympatric rodents, microtus californicus, mus musculus, and reithrodontomys megatolis was studied at four sites in coastal southern california. the study was undertaken to determine the extent of local demographic diversity in rodent populations.the populations of all rodent species became extinct on one site, while on another site the populations fluctuated widely and on two other sites the populations remained relatively stable. the most common species, reithro ... | 1981 | 28309935 |
| intraspecific litter size variation in microtus californicus ii. variation between populations. | | 1980 | 28568450 |
| electrophoretic variation of aconitase and phosphoglucomutase detected in microtus californicus. | four electrophoretic variants of cytoplasmic aconitase (citrate (isocitrate) hydro-lyase, ec 4.2.1.3) were detected in a population of microtus californicus when samples were screened by starch gel electrophoresis using tris/citrate buffers at ph 7.0 and ph 8.7. variation at what is presumed to be the phosphoglucomutase-3 locus (alpha-d-glucose-1,6-diphosphate:alpha-d-glucose-1-phosphate phosphotransferase, ec 2.7.5.1) was also detected with liver samples but was not detected in kidney samples o ... | 1979 | 391287 |
| copulatory behavior and the initiation of pregnancy in california voles (microtus californicus). | the copulatory behavior of microtus californicus and its effect on pregnancy initiation were examined in two experiments. in experiment 1 18 males and 18 females which had received exogenous hormones participated in 54 tests of copulatory behavior, each continued to a satiety criterion of 30 min with no copulations. the basic pattern involved no lock, intravaginal thrusting, ejaculation possible on a single insertion and multiple ejaculation. ejaculation frequency ranged from 1 to 5, with a mean ... | 1979 | 385105 |
| genetic control of enzyme polymorphisms in the california vole, microtus californicus. | inheritance of 15 polymorphic isozymes was investigated in captive microtus californicus. eleven of the isozymes show patterns consistent with a mendelian model of inheritance: glycerol-3-phosphate dehydrogenase (gpd), lactate dehydrogenases a and b (ldh-a and ldh-b), malic enzyme 2 (me-2), isocitrate dehydrogenase 1 (icd-1), phosphogluconate dehydrogenase (pgd), glutamate-oxaloacetate transaminase 1 (got-1) phosphoglucomutase 2 (pgm-2), leucine aminopeptidase (lap), glucosephosphate isomerase ( ... | 1978 | 367362 |
| maintenance of polymorphism in an island population of the california vole, microtus californicus. | | 1977 | 28563487 |
| white spotting in the california vole. | previously unreported white spotting was found in two subspecies of the california vole, microtus californicus. the pattern of spots on the ventral coat of the animals differs between the subspecies, and there is variation in the expressivity of the white spots. expression of white spotting is greatly reduced by the epistatic action of another coat colour gene, the recessive buffy (bf). the incidence of white spotting, its variation in expression, and its inheritance were investigated in this st ... | 1976 | 783091 |
| condition and diet of cycling populations of the california vole, microtus californicus. | | 1971 | 5545554 |
| natural resistance to plague: genetic basis in the vole (microtus californicus). | | 1970 | 5493047 |
| the role of succulent halophytes in the water balance of salt marsh rodents. | the role of succulent halophytes in the water balance and ecology of salt marsh rodents is dependent upon an evaluation of the composition of the available sources and the physiological properties of their potential consumers. studies of the osmotic properties of succulent halophytes from southern california coastal salt marshes are presented, together with experiments regarding the utilization of common pickleweed (salicornia virginica l.) by indigenous populations of cricetid rodents (harvest ... | 1970 | 28309833 |
| ecological studies of wild rodent plague in the san francisco bay area of california. vii. effects of plague in nature on microtus californicus and other wild rodents. | | 1962 | 14454083 |
| indirect effects of a large mammalian herbivore on small mammal populations: context-dependent variation across habitat types, mammal species, and seasons. | multiple consumer species frequently co-occur in the same landscape and, through effects on surrounding environments, can interact in direct and indirect ways. these interactions can vary in occurrence and importance, and focusing on this variation is critical for understanding the dynamics of interactions among consumers. large mammalian herbivores are important engineers of ecosystems worldwide, have substantial impacts on vegetation, and can indirectly affect small-mammal populations. however ... | 2018 | 30598804 |
| long-term and interactive effects of different mammalian consumers on growth, survival, and recruitment of dominant tree species. | throughout the world, numerous tree species are reported to be in decline, either due to increased mortality of established trees or reduced recruitment. the situation appears especially acute for oaks, which are dominant features of many landscapes in the northern hemisphere. although numerous factors have been hypothesized to explain reductions in tree performance, vertebrate herbivores and granivores may serve as important drivers of these changes. here, using data from 8- and 14-year-old exc ... | 2020 | 32884658 |
| diet composition analysis provides new management insights for a highly specialized endangered small mammal. | the critically endangered amargosa vole (microtus californicus scirpensis) is found only in rare marsh habitat near tecopa, california in a plant community dominated by three-square bulrush (schoenoplectus americanus). since the earliest research on the amargosa vole, the existing paradigm has been that these voles are obligatorily dependent on bulrush as their only food source and for the three-dimensional canopy and litter structure it provides for predator avoidance. however, no prior researc ... | 2020 | 33007017 |
| gut microbial diversity across a contact zone for california voles: implications for lineage divergence of hosts and mitonuclear mismatch in the assembly of the mammalian gut microbiome. | gut microbial diversity is thought to reflect the co-evolution of microbes and their hosts as well as current host-specific attributes such as genetic background and environmental setting. to explore interactions among these parameters, we characterized variation in gut microbiome composition of california voles (microtus californicus) across a contact zone between two recently diverged lineages of this species. because this contact zone contains individuals with mismatched mitochondrial-nuclear ... | 2020 | 32282951 |
| habitat of the endangered salt marsh harvest mouse (reithrodontomys raviventris) in san francisco bay. | understanding habitat associations is vital for conservation of at-risk marsh-endemic wildlife species, particularly those under threat from sea level rise. we modeled environmental and habitat associations of the marsh-endemic, federally endangered salt marsh harvest mouse (reithrodontomys raviventris, rera) and co-occurrence with eight associated small mammal species from annual trap data, 1998-2014, in six estuarine marshes in north san francisco bay, california. covariates included microhabi ... | 2020 | 32015834 |
| disease and pathological conditions of an endangered rodent, microtus californicus scirpensis, in a captive-rearing facility and in the wild. | causes of morbidity and mortality and a survey of infectious disease agents were collated from wild and colony-raised endangered amargosa voles (microtus californicus scirpensis). six voles from the wild and 295 voles in the captive-breeding colony were included in the study upon identification of an infectious agent during screening, identification of clinical signs of disease, or finding a pathological condition or infectious agent on necropsy. findings included 28 significant or incidental pa ... | 2020 | 31926505 |
| subpopulation augmentation among habitat patches as a tool to manage an endangered mojave desert wetlands-dependent rodent during anthropogenic restricted water climate regimes. | intensive management may be necessary to protect some highly vulnerable endangered species, particularly those dependent on water availability regimes that might be disrupted by ongoing climate change. the amargosa vole (microtus californicus scirpensis) is an increasingly imperiled rodent constrained to rare wetland habitat in the mojave desert. in 2014 and 2016, we trapped and radio-collared 30 voles, 24 were translocated and six remained at donor and recipient marshes as resident control vole ... | 2019 | 31648291 |
| isotope values of california vole (microtus californicus) hair relate to historical drought and land use patterns in california, usa. | increased drought frequency and intensity and agricultural intensification have been key stressors to ecological systems over the past century. biological proxies (e.g., pollen, tree rings) have been used to track this environmental change; however, linking these changes to the ecology of organisms remains challenging. here, we link historical drought records to conditions of high water-stress in grassland habitats through the stable isotope analysis of california vole museum specimens (microtus ... | 2019 | 31273518 |
| an assessment of vegetation management practices and burrow fumigation with aluminum phosphide as tools for managing voles within perennial crop fields in california, usa. | voles (cricetidae) cause extensive damage to a variety of crops throughout much of the northern hemisphere. the removal of vegetation from crop fields at the end of the growing season, combined with a subsequent burrow fumigant application of aluminum phosphide, has the potential to substantially curtail vole activity but has not been thoroughly examined. we set up a study to test the impact of these management tools in perennial globe artichoke (cynara cardunculus var. scolymus) fields in monte ... | 2019 | 31049861 |
| conservation implications of shifting gut microbiomes in captive-reared endangered voles intended for reintroduction into the wild. | the amargosa vole is a highly endangered rodent endemic to a small stretch of the amargosa river basin in inyo county, california. it specializes on a single, nutritionally marginal food source in nature. as part of a conservation effort to preserve the species, a captive breeding population was established to serve as an insurance colony and a source of individuals to release into the wild as restored habitat becomes available. the colony has successfully been maintained on commercial diets for ... | 2018 | 30213049 |
| mito-nuclear discordance across a recent contact zone for california voles. | to examine the processes that maintain genetic diversity among closely related taxa, we investigated the dynamics of introgression across a contact zone between two lineages of california voles (microtus californicus). we tested the prediction that introgression of nuclear loci would be greater than that for mitochondrial loci, assuming ongoing gene flow across the contact zone. we also predicted that genomic markers would show a mosaic pattern of differentiation across this zone, consistent wit ... | 2018 | 29988439 |
| eradication of a tropical rat mite ( ornithonyssus bacoti) infestation from a captive colony of endangered amargosa voles ( microtus californicus scirpensis). | staff at a university laboratory responsible for management of a captive insurance colony of endangered amargosa voles ( microtus californicus scirpensis) discovered an outbreak of tropical rat mites ( ornithonyssus bacoti) infesting 106 voles. this bloodsucking mesostigmatid mite typically occurs in laboratory settings and can cause weight loss, wounds, or other negative impacts on health. the source of the infestation was likely feral rodents, and the route was suspected to be straw bedding. t ... | 2018 | 29900773 |
| apical elongation of molar teeth in captive microtus voles. | molar apical elongation (mae) was the leading cause for euthanasia or death in a captive breeding colony of endangered amargosa voles ( microtus californicus scirpensis). clinical signs included ocular discharge, abnormal mastication, dyspnea, abnormal mentation, weight loss, and death. although the severity varied, all molars in all quadrants were affected. when severe, the overgrown molar reserve crown and apex protruded into the nasal meatuses, the orbit, the calvarial vault and through the v ... | 2018 | 29665753 |
| successful care and propagation of the endangered amargosa vole (microtus californicus scirpensis) in captivity. | the amargosa vole (microtus californicus scirpensis) is a highlyendangered rodent endemic to a small stretch of the california portion of the amargosa river basin in inyo county's mojave desert. although the amargosa vole has survived in this naturally fragmented ecosystem for thousands of years, recent habitat degradation due to land development, water drainage, and marsh exploitation has further isolated the species and reduced its available habitat. as part of a conservation effort to preserv ... | 2018 | 29377272 |