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development of an automated dispenser for the delivery of medicinal or vaccine-laden baits to raccoons (procyon lotor).medicinal baits are distributed to manage zoonotic diseases, including raccoon (procyon lotor) rabies, but efficient distribution strategies are needed for suburban environments. we developed an automated dispenser that transfers fishmeal polymer baits at user-specified intervals from a magazine to a receptacle fitted with a filter that exploits raccoon dexterity to limit consumption by nontarget species. we introduce the concept of automated dispensers and describe bait removal success rates fo ...201525647587
phylogeographic structure of the white-footed mouse and the deer mouse, two lyme disease reservoir hosts in québec.modification of a species range is one of many consequences of climate change and is driving the emergence of lyme disease in eastern canada. the primary reservoir host of the bacteria responsible for lyme disease, borrelia burgdorferi, is the white-footed mouse (peromyscus leucopus), whose range is rapidly shifting north into southern québec. the deer mouse, p. maniculatus, is occurring over most québec province and is a less competent host for b. burgdorferi. here, we compared the phylogeograp ...201526633555
disruption of bbe02 by insertion of a luciferase gene increases transformation efficiency of borrelia burgdorferi and allows live imaging in lyme disease susceptible c3h mice.lyme disease is the most prevalent tick-borne disease in north america and europe. the causative agent, borrelia burgdorferi persists in the white-footed mouse. infection with b. burgdorferi can cause acute to persistent multisystemic lyme disease in humans. some disease manifestations are also exhibited in the mouse model of lyme disease. genetic manipulation of b. burgdorferi remains difficult. first, b. burgdorferi contains a large number of endogenous plasmids with unique sequences encoding ...201526069970
association between body size and reservoir competence of mammals bearing borrelia burgdorferi at an endemic site in the northeastern united states.the reservoirs for the lyme disease agent, borrelia burgdorferi, are dominated by several different small to medium sized mammals in eastern north america.201526024881
broad diversity of host responses of the white-footed mouse peromyscus leucopus to borrelia infection and antigens.peromyscus leucopus, the white-footed mouse, is one of the more abundant mammals of north america and is a major reservoir host for at least five tickborne diseases of humans, including lyme disease and a newly-recognized form of relapsing fever. in comparison to mus musculus, which is not a natural reservoir for any of these infections, there has been little research on experimental infections in p. leucopus. with the aim of further characterizing the diversity of phenotypes of host responses, ...201526005106
the lyme disease pathogen has no effect on the survival of its rodent reservoir host.zoonotic pathogens that cause devastating morbidity and mortality in humans may be relatively harmless in their natural reservoir hosts. the tick-borne bacterium borrelia burgdorferi causes lyme disease in humans but few studies have investigated whether this pathogen reduces the fitness of its reservoir hosts under natural conditions. we analyzed four years of capture-mark-recapture (cmr) data on a population of white-footed mice, peromyscus leucopus, to test whether b. burgdorferi and its tick ...201525688863
borrelia burgdorferi promotes the establishment of babesia microti in the northeastern united states.babesia microti and borrelia burgdorferi, the respective causative agents of human babesiosis and lyme disease, are maintained in their enzootic cycles by the blacklegged tick (ixodes scapularis) and use the white-footed mouse (peromyscus leucopus) as primary reservoir host. the geographic range of both pathogens has expanded in the united states, but the spread of babesiosis has lagged behind that of lyme disease. several studies have estimated the basic reproduction number (r0) for b. microti ...201425545393
peromyscus leucopus mice: a potential animal model for haematological studies.peromyscus leucopus mice share physical similarities with laboratory mice mus musculus (mm) but have higher agility and longer lifespan. we compared domesticated p. leucopus linville (pll) and m. musculus c57bl/6 (mmb6) mice for cellular composition of peripheral blood (pb), bone marrow (bm) and spleen. pll mice had significantly fewer platelets and significantly more monocytes in the blood, and notably fewer megakaryocytes in the bm. spleens of pll mice were significantly smaller, with 50% fewe ...201425116892
emergence of ixodes scapularis and borrelia burgdorferi, the lyme disease vector and agent, in ohio.lyme disease, the most common vector-borne disease in the united states, is caused by a tick-borne infection with borrelia burgdorferi. currently, ohio is considered by the centers for disease control and prevention (cdc) to be non-endemic for lyme disease. the low incidence of lyme disease in this state was largely attributed to the absence of the transmitting vector, ixodes scapularis, commonly known as the blacklegged tick. however, a tick surveillance program established by ohio department o ...201424926441
climate change and habitat fragmentation drive the occurrence of borrelia burgdorferi, the agent of lyme disease, at the northeastern limit of its distribution.lyme borreliosis is rapidly emerging in canada, and climate change is likely a key driver of the northern spread of the disease in north america. we used field and modeling approaches to predict the risk of occurrence of borrelia burgdorferi, the bacteria causing lyme disease in north america. we combined climatic and landscape variables to model the current and future (2050) potential distribution of the black-legged tick and the white-footed mouse at the northeastern range limit of lyme diseas ...201425469157
lyme disease risk not amplified in a species-poor vertebrate community: similar borrelia burgdorferi tick infection prevalence and ospc genotype frequencies.the effect of biodiversity declines on human health is currently debated, but empirical assessments are lacking. lyme disease provides a model system to assess relationships between biodiversity and human disease because the etiologic agent, borrelia burgdorferi, is transmitted in the united states by the generalist black-legged tick (ixodes scapularis) among a wide range of mammalian and avian hosts. the 'dilution effect' hypothesis predicts that species-poor host communities dominated by white ...201424787999
geography, deer, and host biodiversity shape the pattern of lyme disease emergence in the thousand islands archipelago of ontario, canada.in the thousand islands region of eastern ontario, canada, lyme disease is emerging as a serious health risk. the factors that influence lyme disease risk, as measured by the number of blacklegged tick (ixodes scapularis) vectors infected with borrelia burgdorferi, are complex and vary across eastern north america. despite study sites in the thousand islands being in close geographic proximity, host communities differed and both the abundance of ticks and the prevalence of b. burgdorferi infecti ...201424416435
prevalence of human-active and variant 1 strains of the tick-borne pathogen anaplasma phagocytophilum in hosts and forests of eastern north america.anaplasmosis is an emerging infectious disease caused by infection with the bacterium anaplasma phagocytophilum. in the eastern united states, a. phagocytophilum is transmitted to hosts through the bite of the blacklegged tick, ixodes scapularis. we determined the realized reservoir competence of 14 species of common vertebrate hosts for ticks by establishing the probability that each species transmits two important strains of a. phagocytophilum (a. phagocytophilum human-active, which causes hum ...201424865688
paracellular nutrient absorption is higher in bats than rodents: integrating from intact animals to the molecular level.flying vertebrates have been hypothesized to rely heavily on paracellular absorption of nutrients to compensate for having smaller intestines than non-flyers. we tested this hypothesis in an insectivorous bat (myotis lucifugus) and two insect-eating rodents (onychomys leucogaster and peromyscus leucopus). in intact animals, the fractional absorption of orally dosed l-arabinose (mr 150) was 82% in m. lucifugus, which was more than twice that of the rodents. absorption of creatinine (mr 113) was g ...201425063860
when is a parasite not a parasite? effects of larval tick burdens on white-footed mouse survival.many animal species can carry considerable burdens of ectoparasites: parasites living on the outside of a host's body. ectoparasite infestation can decrease host survival, but the magnitude and even direction of survival effects can vary depending on the type of ectoparasite and the nature and duration of the association. when ectoparasites also serve as vectors of pathogens, the effects of ectoparasite infestation on host survival have the potential to alter disease dynamics by regulating host ...201425000767
expansion of zoonotic babesiosis and reported human cases, connecticut, 2001-2010.to document the expansion of human babesiosis in connecticut, we analyzed reservoir host sera for seroreactivity to babesia microti franca and reviewed connecticut human surveillance case data collected during 2001-2010. sera from white-footed mice, peromyscus leucopus rafinesque, from 10 towns in 5 counties, collected at 4-7-yr periods between 2001 and 2010, were tested for total immunoglobulins. the prevalence of b. microti-positive mice was compared with confirmed and probable human case repo ...201424605475
[lyme disease: an update].lyme disease is an emerging infection caused by the spirochete borrelia burgdorferi. it is the most common vector-borne disease in the usa and europe, and it is transmitted to humans through the bite of ticks of the genus ixodes. its animal reservoirs are the white-tailed deer, the white-footed mouse, and other small mammals. it is considered the new "great imitator", with its diagnosis being a major challenge. traditionally it is divided into four stages, early localized disease, early dissemin ...201424481435
landscape resistance and habitat combine to provide an optimal model of genetic structure and connectivity at the range margin of a small mammal.we evaluated the effect of habitat and landscape characteristics on the population genetic structure of the white-footed mouse. we develop a new approach that uses numerical optimization to define a model that combines site differences and landscape resistance to explain the genetic differentiation between mouse populations inhabiting forest patches in southern québec. we used ecological distance computed from resistance surfaces with circuitscape to infer the effect of the landscape matrix on g ...201424975474
photoperiodic regulation of hippocampal neurogenesis in adult male white-footed mice (peromyscus leucopus).photoperiodic organisms monitor environmental day length to engage in seasonally appropriate adaptions in physiology and behavior. among these adaptations are changes in brain volume and neurogenesis, which have been well described in multiple species of birds, yet few studies have described such changes in the brains of adult mammals. white-footed mice (peromyscus leucopus) are an excellent species in which to investigate the effects of day length on adult hippocampal neurogenesis, as males, in ...201424893623
urban park characteristics, genetic variation, and historical demography of white-footed mouse (peromyscus leucopus) populations in new york city.severe fragmentation is a typical fate of native remnant habitats in cities, and urban wildlife with limited dispersal ability are predicted to lose genetic variation in isolated urban patches. however, little information exists on the characteristics of urban green spaces required to conserve genetic variation. in this study, we examine whether isolation in new york city (nyc) parks results in genetic bottlenecks in white-footed mice (peromyscus leucopus), and test the hypotheses that park size ...201424688884
insulins, leptin and feeding in a population of peromyscus leucopus (white-footed mouse) with variable fertility.this article is part of a special issue "energy balance". natural populations display a variety of reproductive responses to environmental cues, but the underlying physiology that causes these responses is largely unknown. this study tested the hypothesis that heritable variation in reproductive traits can be described by heritable variation in concentrations of hormones critical to both energy balance and reproduction. to test this hypothesis, we used mouse lines derived from a wild population ...201424583085
heritable variation in reaction norms of metabolism and activity across temperatures in a wild-derived population of white-footed mice (peromyscus leucopus).heritable variation in metabolic traits is likely to affect fitness. in this study, white-footed mice from wild-derived photoresponsive [r, infertile in short day length (sd)] and non-photoresponsive (nr, fertile in sd) selection lines were maintained under short-day (sd 8light:16dark), sub-thermoneutral conditions (22 or 12 °c). mice had significantly higher levels of food intake and resting metabolic rates (rmr) at low temperature. rmr differed significantly between lines (greater in nr mice). ...201424549715
landscape models for nuclear genetic diversity and genetic structure in white-footed mice (peromyscus leucopus).dramatic changes in the north american landscape over the last 12 000 years have shaped the genomes of the small mammals, such as the white-footed mouse (peromyscus leucopus), which currently inhabit the region. however, very recent interactions of populations with each other and the environment are expected to leave the most pronounced signature on rapidly evolving nuclear microsatellite loci. we analyzed landscape characteristics and microsatellite markers of p. leucopus populations along a tr ...201424448564
congruent morphological and genetic differentiation as a signature of range expansion in a fragmented landscape.phenotypic differentiation is often interpreted as a result of local adaptation of individuals to their environment. here, we investigated the skull morphological differentiation in 11 populations of the white-footed mouse (peromyscus leucopus). these populations were sampled in an agricultural landscape in the montérégie region (québec, canada), at the northern edge of the distribution of the white-footed mouse. we found a strong pattern of phenotypic differentiation matching the genetic struct ...201324324868
signatures of rapid evolution in urban and rural transcriptomes of white-footed mice (peromyscus leucopus) in the new york metropolitan area.urbanization is a major cause of ecological degradation around the world, and human settlement in large cities is accelerating. new york city (nyc) is one of the oldest and most urbanized cities in north america, but still maintains 20% vegetation cover and substantial populations of some native wildlife. the white-footed mouse, peromyscusleucopus, is a common resident of nyc's forest fragments and an emerging model system for examining the evolutionary consequences of urbanization. in this stud ...201324015321
evolution of peromyscus leucopus mice in response to a captive environment.many wildlife species are propagated in captivity as models for behavioral, physiological, and genetic research or to provide assurance populations to protect threatened species. however, very little is known about how animals evolve in the novel environment of captivity. the histories of most laboratory strains are poorly documented, and protected populations of wildlife species are usually too small and too short-term to allow robust statistical analysis. to document the evolutionary change in ...201323940813
exogenous melatonin reproduces the effects of short day lengths on hippocampal function in male white-footed mice, peromyscus leucopus.photoperiodism is a biological phenomenon, common among organisms living outside of the tropics, by which environmental day length is used to ascertain the time of year to engage in seasonally-appropriate adaptations. white-footed mice (peromyscus leucopus) are small photoperiodic rodents which display a suite of adaptive winter responses to short day lengths mediated by the extended duration of nightly melatonin secretion. exposure to short days alters hippocampal dendritic morphology, impairs ...201323806713
evidence for feedback control of pineal melatonin secretion.melatonin is the principle hormonal product of the pineal gland. it is secreted with a robust daily rhythm, peaking near the middle of the night. during the daytime, concentrations remain very low, as exposure to light robustly suppresses its secretion. the regulation of melatonin by light is well-characterized, but an interesting feature of the daily melatonin rhythm is that its peak occurs near the middle of the night and then levels begin to drop hours before morning light exposure. the mecha ...201323528860
linking predator-prey interactions with exposure to a trophically transmitted parasite using pcr-based analyses.parasite transmission is determined by the rate of contact between a susceptible host and an infective stage and susceptibility to infection given an exposure event. attempts to measure levels of variation in exposure in natural populations can be especially challenging. the level of exposure to a major class of parasites, trophically transmitted parasites, can be estimated by investigating the host's feeding behaviour. since the parasites rely on the ingestion of infective intermediate hosts fo ...201323110593
comparing radiation toxicities across species: an examination of radiation effects in mus musculus and peromyscus leucopus.life shortening and pathological complications in similarly irradiated cohorts of the laboratory mouse mus musculus and the white-footed mouse peromyscus leucopus were recorded in the course of the janus studies conducted at argonne national laboratory from 1970-1992. this study examines how lifespan, tumor and non-tumor disease incidence, and tumor multiplicity are differentially affected by gamma-rays and neutron radiation exposure in two different animal species.201323362954
reduced mitochondrial ros, enhanced antioxidant defense, and distinct age-related changes in oxidative damage in muscles of long-lived peromyscus leucopus.comparing biological processes in closely related species with divergent life spans is a powerful approach to study mechanisms of aging. the oxidative stress hypothesis of aging predicts that longer-lived species would have lower reactive oxygen species (ros) generation and/or an increased antioxidant capacity, resulting in reduced oxidative damage with age than in shorter-lived species. in this study, we measured ros generation in the young adult animals of the long-lived white-footed mouse, pe ...201323325454
associations between innate immune function and ectoparasites in wild rodent hosts.immune function is an important component of host fitness, and high investment in immunity should occur when the benefits outweigh the costs, such as when risk of parasitism is high. we sampled two rodent hosts, white-footed mice (peromyscus leucopus), and prairie voles (microtus ochrogaster), and their tick, flea, and mite ectoparasites. a bacterial killing assay was used to measure the host's innate immune function. we hypothesized that classes of hosts (species, sexes, or age classes) with ov ...201323417097
genetic structure of the white-footed mouse in the context of the emergence of lyme disease in southern québec.the white-footed mouse (peromyscus leucopus) has expanded its northern limit into southern québec over the last few decades. p. leucopus is a great disperser and colonizer and is of particular interest because it is considered a primary reservoir for the spirochete bacterium that causes lyme disease. there is no current information on the gene flow between mouse populations on the mountains and forest fragments found scattered throughout the montérégie region in southern québec, and whether vari ...201323919153
inferring epitopes of a polymorphic antigen amidst broadly cross-reactive antibodies using protein microarrays: a study of ospc proteins of borrelia burgdorferi.epitope mapping studies aim to identify the binding sites of antibody-antigen interactions to enhance the development of vaccines, diagnostics and immunotherapeutic compounds. however, mapping is a laborious process employing time- and resource-consuming 'wet bench' techniques or epitope prediction software that are still in their infancy. for polymorphic antigens, another challenge is characterizing cross-reactivity between epitopes, teasing out distinctions between broadly cross-reactive respo ...201323826301
detection of babesia microti and borrelia burgdorferi in host-seeking ixodes scapularis (acari: ixodidae) in monmouth county, new jersey.the etiological agents that cause human babesiosis (babesia microti) and lyme disease (borrelia burgdorferi) share a common tick vector (ixodes scapularis say) and rodent reservoir (peromyscus leucopus), but because the geographical distribution of babesiosis is more restricted than lyme disease, it was not considered a nationally notifiable disease until 2011. although recent studies have shown dramatic increases in the number of cases of babesiosis and expansion of its range, little is known a ...201323540127
an experimental test of competition among mice, chipmunks, and squirrels in deciduous forest fragments.mixed hardwood forests of the northeast united states support a guild of granivorous/omnivorous rodents including gray squirrels (sciurus carolinensis), eastern chipmunks (tamias striatus), and white-footed mice (peromyscus leucopus). these species coincide geographically, co-occur locally, and consume similar food resources. despite their idiosyncratic responses to landscape and patch variables, patch occupancy models suggest that competition may influence their respective distributions and abu ...201323824654
chemical attraction of dermacentor variabilis ticks parasitic to peromyscus leucopus based on host body mass and sex.macroparasites are commonly aggregated on a small subset of a host population. previous explanations for this aggregation relate to differences in immunocompetence or the degree to which hosts encounter parasites. we propose active tick host choice through chemical attraction as a potential mechanism leading to aggregated tick burdens. we test this hypothesis using a y-maze olfactometer, comparing chemical attraction responses of larval and nymphal dermacentor variabilis ticks parasitic to the w ...201323543274
baylisascaris procyonis infection in white-footed mice: predicting patterns of infection from landscape habitat attributes.there is a growing body of evidence that habitat fragmentation resulting from anthropogenic land use can alter the transmission dynamics of infectious disease. baylisascaris procyonis , a parasitic roundworm with the ability to cause fatal central nervous system disease in many mammals, including humans, is a zoonotic threat, and research suggests that parasite recruitment rates by intermediate hosts are highly variable among forest patches in fragmented landscapes. during 2008, we sampled 353 w ...201323656487
potential role of deer tick virus in powassan encephalitis cases in lyme disease-endemic areas of new york, u.s.a.powassan virus, a member of the tick-borne encephalitis group of flaviviruses, encompasses 2 lineages with separate enzootic cycles. the prototype lineage of powassan virus (powv) is principally maintained between ixodes cookei ticks and the groundhog (marmota momax) or striped skunk (mephitis mephitis), whereas the deer tick virus (dtv) lineage is believed to be maintained between ixodes scapularis ticks and the white-footed mouse (peromyscus leucopus). we report 14 cases of powassan encephalit ...201324274334
poleward expansion of the white-footed mouse (peromyscus leucopus) under climate change: implications for the spread of lyme disease.the white-footed mouse (peromyscus leucopus) is an important reservoir host for borrelia burgdorferi, the pathogen responsible for lyme disease, and its distribution is expanding northward. we used an ecological niche factor analysis to identify the climatic factors associated with the distribution shift of the white-footed mouse over the last 30 years at the northern edge of its range, and modeled its current and potential future (2050) distributions using the platform biomod. a mild and shorte ...201324260464
feeding of ticks on animals for transmission and xenodiagnosis in lyme disease research.transmission of the etiologic agent of lyme disease, borrelia burgdorferi, occurs by the attachment and blood feeding of ixodes species ticks on mammalian hosts. in nature, this zoonotic bacterial pathogen may use a variety of reservoir hosts, but the white-footed mouse (peromyscus leucopus) is the primary reservoir for larval and nymphal ticks in north america. humans are incidental hosts most frequently infected with b. burgdorferi by the bite of ticks in the nymphal stage. b. burgdorferi adap ...201324022694
serum antibodies to borrelia burgdorferi, anaplasma phagocytophilum, and babesia microti in recaptured white-footed mice.a mark-release-recapture study was conducted during 2007 through 2010 in six, tick-infested sites in connecticut, united states to measure changes in antibody titers for borrelia burgdorferi sensu stricto, anaplasma phagocytophilum, and babesia microti in peromyscus leucopus (white-footed mice). there was an overall recapture rate of 40%, but only four tagged mice were caught in ≥2 yr. sera from 561 mice were analyzed for total antibodies to b. burgdorferi and a. phagocytophilum by using whole-c ...201323568904
identification of borrelia burgdorferi ospc genotypes in host tissue and feeding ticks by terminal restriction fragment length polymorphisms.we developed a high-throughput method based on terminal restriction fragment length polymorphisms (t-rflp) to identify ospc genotypes from field-collected samples of borrelia burgdorferi. we first validated the method by analyzing b. burgdorferi ospc previously identified by sequencing. we then analyzed and compared ospc genotypes detected from ear biopsy tissue from natural populations of the white-footed mouse, a major b. burgdorferi reservoir host species in the eastern united states, and lar ...201323183976
experimental infections of the reservoir species peromyscus leucopus with diverse strains of borrelia burgdorferi, a lyme disease agent.the rodent peromyscus leucopus is a major natural reservoir for the lyme disease agent borrelia burgdorferi and a host for its vector ixodes scapularis. at various locations in northeastern united states 10 to 15 b. burgdorferi strains coexist at different prevalences in tick populations. we asked whether representative strains of high or low prevalence differed in their infections of p. leucopus. after 5 weeks of experimental infection of groups with each of 6 isolates, distributions and burden ...201223221801
reservoir competence of wildlife host species for babesia microti.human babesiosis is an increasing health concern in the northeastern united states, where the causal agent, babesia microti, is spread through the bite of infected ixodes scapularis ticks. we sampled 10 mammal and 4 bird species within a vertebrate host community in southeastern new york to quantify reservoir competence (mean percentage of ticks infected by an individual host) using real-time pcr. we found reservoir competence levels >17% in white-footed mice (peromyscus leucopus), raccoons (pro ...201223171673
the effect of spatial heterogenity on the aggregation of ticks on white-footed mice.parasites are often aggregated on a minority of the individuals in their host populations. although host characteristics are commonly presumed to explain parasite aggregation on hosts, spatio-temporal aggregation of parasites during their host-seeking stages may have a dominant effect on the aggregation on hosts. we aimed to quantify, using mixed models, repeatability and autocorrelation analyses, the degree to which the aggregation of blacklegged ticks (ixodes scapularis) on white-footed mice ( ...201222409977
effects of disturbance on small mammal community structure in the new jersey pinelands, usa.we compared small mammal community composition among undisturbed habitats and habitats disturbed by military operations on warren grove gunnery range (wgr) in the new jersey pinelands. wgr is one of the largest tracts of protected land within this globally rare ecosystem. disturbance in the form of fire, mowing, soil disruption and logging has had a large effect on small mammal occurrence and distribution. of the 14 small mammal species that occur in the pinelands, 9 live on wgr, including large ...201222405445
modeling the influence of peromyscus leucopus body mass, sex, and habitat on immature dermacentor variabilis burden.immature (larvae and nymph) tick burden on rodents is an important determinant of adult tick population size and understanding infectious disease dynamics. the objective of this research was to build a descriptive model for immature dermacentor variabilis burden on peromyscus leucopus. mice were live-trapped on two permanent grids in an old field and an early successional forest every other month between april and october, 2006-2009. negative binomial regression was used to examine the associati ...201223181857
predicted outcomes of vaccinating wildlife to reduce human risk of lyme disease.vaccination efforts for lyme disease prevention in humans have focused on wildlife reservoirs to target the causative agent, borrelia burgdorferi, for elimination in vector ticks. multiple host species are involved in the transmission and maintenance of the bacterium, but not all host species can be vaccinated effectively. to evaluate vaccinating a subset of hosts in the context of host-tick interactions, we constructed and evaluated a dynamic model of b. burgdorferi transmission in mice. our an ...201222251312
monogamous and promiscuous rodent species exhibit discrete variation in the size of the medial prefrontal cortex.limbic-associated cortical areas, such as the medial prefrontal and retrosplenial cortex (mpfc and rs, respectively), are involved in the processing of emotion, motivation, and various aspects of working memory and have been implicated in mating behavior. to determine whether the independent evolution of mating systems is associated with a convergence in cortical mechanisms, we compared the size of mpfc and rs between the monogamous prairie vole (microtus ochrogaster) and the promiscuous meadow ...201222759599
buffering and plasticity in vital rates of oldfield rodents.1. under the hypothesis of environmental buffering, populations are expected to minimize the variance of the most influential vital rates; however, this may not be a universal principle. species with a life span <1 year may be less likely to exhibit buffering because of temporal or seasonal variability in vital rate sensitivities. further, plasticity in vital rates may be adaptive for species in a variable environment with reliable cues. 2. we tested for environmental buffering and plasticity in ...201222375923
high diversity of rna viruses in rodents, ethiopia.we investigated synanthropic small mammals in the ethiopian highlands as potential reservoirs for human pathogens and found that 2 rodent species, the ethiopian white-footed mouse and awash multimammate mouse, are carriers of novel mobala virus strains. the white-footed mouse also carries a novel hantavirus, the second murinae-associated hantavirus found in africa.201223171649
a comparison of scent marking between a monogamous and promiscuous species of peromyscus: pair bonded males do not advertise to novel females.scent marking can provide behavioral and physiological information including territory ownership and mate advertisement. it is unknown how mating status and pair cohabitation influence marking by males from different social systems. we compared the highly territorial and monogamous california mouse (peromyscus californicus) to the less territorial and promiscuous white-footed mouse (p. leucopus). single and mated males of both species were assigned to one of the following arenas lined with filte ...201222393377
arboreal habitat structure affects locomotor speed and perch choice of white-footed mice (peromyscus leucopus).arboreal habitats pose several challenges for locomotion resulting from narrow cylindrical surfaces, steep slopes, and secondary branches that can form obstructions. we used laboratory trials to test whether different diameters, slopes, or complexity of branches affected maximum speeds and perch choice of the semi-arboreal white-footed mouse (peromyscus leucopus). we tested locomotor performance of mice running horizontally and up and down 45° slopes for cylindrical artificial branches with five ...201222927206
photoperiod mediated changes in olfactory bulb neurogenesis and olfactory behavior in male white-footed mice (peromyscus leucopus).brain plasticity, in relation to new adult mammalian neurons generated in the subgranular zone of the hippocampus, has been well described. however, the functional outcome of new adult olfactory neurons born in the subventricular zone of the lateral ventricles is not clearly defined, as manipulating neurogenesis through various methods has given inconsistent and conflicting results in lab mice. several small rodent species, including peromyscus leucopus, display seasonal (photoperiodic) brain pl ...201222912730
calcium availability influences litter size and sex ratio in white-footed mice (peromyscus leucopus).the production of offspring typically requires investment of resources derived from both the environment and maternal somatic reserves. as such, the availability of either of these types of resources has the potential to limit the degree to which resources are allocated to reproduction. theory and empirical studies have argued that mothers modify reproductive performance relative to exogenous resource availability and maternal condition by adjusting size, number or sex of offspring produced. the ...201222870218
photoperiod alters fear responses and basolateral amygdala neuronal spine density in white-footed mice (peromyscus leucopus).photoperiodism is a biological phenomenon in which environmental day length is monitored to ascertain time of year to engage in seasonally appropriate adaptations. this trait is common among organisms living outside of the tropics. white-footed mice (peromyscus leucopus) are small photoperiodic rodents which display a suite of adaptive responses to short day lengths, including reduced hippocampal volume, impairments in hippocampal-mediated memory, and enhanced hypothalamic-pituitary-adrenal axis ...201222652395
regulatory changes contribute to the adaptive enhancement of thermogenic capacity in high-altitude deer mice.in response to hypoxic stress, many animals compensate for a reduced cellular o(2) supply by suppressing total metabolism, thereby reducing o(2) demand. for small endotherms that are native to high-altitude environments, this is not always a viable strategy, as the capacity for sustained aerobic thermogenesis is critical for survival during periods of prolonged cold stress. for example, survivorship studies of deer mice (peromyscus maniculatus) have demonstrated that thermogenic capacity is unde ...201222586089
urban landscape genetics: canopy cover predicts gene flow between white-footed mouse (peromyscus leucopus) populations in new york city.in this study, i examine the influence of urban canopy cover on gene flow between 15 white-footed mouse (peromyscus leucopus) populations in new york city parklands. parks in the urban core are often highly fragmented, leading to rapid genetic differentiation of relatively nonvagile species. however, a diverse array of 'green' spaces may provide dispersal corridors through 'grey' urban infrastructure. i identify urban landscape features that promote genetic connectivity in an urban environment a ...201222320856
trophic shifts of a generalist consumer in response to resource pulses.trophic shifts of generalist consumers can have broad food-web and biodiversity consequences through altered trophic flows and vertical diversity. previous studies have used trophic shifts as indicators of food-web responses to perturbations, such as species invasion, and spatial or temporal subsidies. resource pulses, as a form of temporal subsidies, have been found to be quite common among various ecosystems, affecting organisms at multiple trophic levels. although diet switching of generalist ...201121437248
species differences in the winner effect disappear in response to post-victory testosterone manipulations.evolutionary processes can interact with the mechanisms of steroid hormone action to drive interspecific variation in behavioural output, yet the exact nature of these interactions is poorly understood. to investigate this issue, we compare the endocrine machinery underlying the winner effect (an ability to increase winning behaviour in response to past victories) in two closely related species of peromyscus mice. typically, after winning a fight, california mice (peromyscus californicus) experi ...201121490015
novel hepatozoon in vertebrates from the southern united states.abstract novel hepatozoon spp. sequences collected from previously unrecognized vertebrate hosts in north america were compared with documented hepatozoon 18s rrna sequences in an effort to examine phylogenetic relationships between the different hepatozoon organisms found cycling in nature. an approximately 500 base pair fragment of 18s rdna common to hepatozoon spp. and some other apicomplexans was amplified and sequenced from the tissues or blood of 16 vertebrate host species from the souther ...201121506825
complex life cycle of pterygodermatites peromysci, a trophically transmitted parasite of the white-footed mouse (peromyscus leucopus).the aim of this study is to experimentally verify the intermediate host of a common gastrointestinal nematode, pterygodermatites peromysci, infecting the white-footed mouse (peromyscus leucopus) and describe the complex life cycle. as with other nematodes in the family rictulariidae, adult worms reside in the small intestine of the host, and infective eggs are shed into the environment where they are ingested by scavenger insects. a field survey of common nocturnal insects on the forest floors o ...201121766236
dynamics of hantavirus infection in peromyscus leucopus of central pennsylvania.abstract hantaviruses are distributed throughout the united states and are the etiologic agents for hantavirus pulmonary syndrome and hemorrhagic fever with renal syndrome. hantavirus genotypes and epidemiologic patterns vary spatially across the united states. while several longitudinal studies have been performed in the western united states, little is known about the virus in the eastern united states. we undertook a longitudinal study of hantaviruses in the primary rodent reservoir host in c ...201121756028
ixodes scapularis and borrelia burgdorferi among diverse habitats within a natural area in east-central illinois.abstract the distributions of the tick vector, ixodes scapularis, and of the etiologic agent of lyme disease, borrelia burgdorferi (bb), have continued expanding in illinois over the past 20 years, but the extent of their spread is not well known. the role of multiple habitats in the establishment and maintenance of i. scapularis and bb at local scales is not well understood, and the use of integrated approaches to evaluate local scale dynamics is rare. we evaluated habitat diversity and tempora ...201121688974
development of a baited oral vaccine for use in reservoir-targeted strategies against lyme disease.lyme disease is a major human health problem which continues to increase in incidence and geographic distribution. as a vector-borne zoonotic disease, lyme disease may be amenable to reservoir targeted strategies for control. we have previously reported that a vaccinia virus (vv) based vaccine expressing outer surface protein a (ospa) of borrelia burgdorferi, the causative agent of lyme disease, protects inbred strains of laboratory mice against infection by feeding ticks and clears the ticks of ...201121816190
strong density-dependent competition and acquired immunity constrain parasite establishment: implications for parasite aggregation.the vast majority of parasites exhibit an aggregated frequency distribution within their host population, such that most hosts have few or no parasites while only a minority of hosts are heavily infected. one exception to this rule is the trophically transmitted parasite pterygodermatites peromysci of the white-footed mouse (peromyscus leucopus), which is randomly distributed within its host population. here, we ask: what are the factors generating the random distribution of parasites in this sy ...201121215747
presence of hyperplastic pectoral mammary glands in a white-footed mouse (peromyscus leucopus) from a superfund site in oklahoma, usa.laboratory experiments have documented the effects of hormones and endocrine-disrupting compounds on mammary development in mammals. however, few observations of mammary hyperplasia have been presented for wild rodents. we describe hyperplastic mammary glands in a wild-caught white-footed mouse (peromyscus leucopus) from an area contaminated with heavy metals.201121270018
the dynamics of macroparasite host-self-infection: a study of the patterns and processes of pinworm (oxyuridae) aggregation.among parasites, taylor's power law identifies a tight relationship in aggregation of macroparasite infection intensity with few exceptions; notably, the nematode family oxyuridae tends to have higher than expected aggregation. oxyuridae infect a wide range of mammalian hosts and have a unique reproductive strategy that involves conventional horizontal transmission, as well as re-infection of an already infected host. we asked the question, do the unique aspects of pinworm life-history explain a ...201121349221
associations between ixodes scapularis ticks and small mammal hosts in a newly endemic zone in southeastern canada: implications for borrelia burgdorferi transmission.immature ixodes scapularis infestation and borrelia burgdorferi infection of wild small mammals were studied from june to october in 2007 and from may to october in 2008 at 71 study sites in a zone where i. scapularis populations and environmental lyme disease risk are emerging in southwestern quebec. seasonal host-seeking activity of immature i. scapularis was similar to patterns reported previously in canada and the usa: nymphal activity peaked in spring while larval activity peaked in late su ...201122108010
Habitat correlates with the spatial distribution of ectoparasites on Peromyscus leucopus in southern Michigan.The goal of this study was to evaluate the role of habitat in determining ectoparasite distribution of Peromyscus leucopus. We tested the hypothesis that ectoparasite occurrence is associated with particular host environments and this association is stronger for ectoparasites with limited interactions (i.e., ticks) than those with frequent interactions (i.e., lice). Ectoparasites from three different groups (Acari, Siphonaptera, and Phthiraptera) were collected from P. leucopus inhabiting a numb ...201122129402
agents of human anaplasmosis and lyme disease at camp ripley, minnesota.the transmission dynamics of anaplasma phagocytophilum (ap) and borrelia burgdorferi (bb) among ixodes scapularis (is) and mammalian hosts was investigated at camp ripley, an area representative of central minnesota. prevalence of white-footed mouse infection with ap and bb were 20% and 42%, respectively, with a coinfection level of 14%. peak levels of infection with both agents occurred in may. the average levels of seropositivity to ap and bb were 29.3% and 48%, respectively. of the mice infec ...201121867420
partitioning the aggregation of parasites on hosts into intrinsic and extrinsic components via an extended poisson-gamma mixture model.it is well known that parasites are often highly aggregated on their hosts such that relatively few individuals host the large majority of parasites. when the parasites are vectors of infectious disease, a key consequence of this aggregation can be increased disease transmission rates. the cause of this aggregation, however, is much less clear, especially for parasites such as arthropod vectors, which generally spend only a short time on their hosts. regression-based analyses of ticks on various ...201122216216
borrelia burgdorferi has minimal impact on the lyme disease reservoir host peromyscus leucopus.the epidemiology of vector-borne zoonotic diseases is determined by encounter rates between vectors and hosts. alterations to the behavior of reservoir hosts caused by the infectious agent have the potential to dramatically alter disease transmission and human risk. we examined the effect of borrelia burgdorferi, the etiological agent of lyme disease, on one of its most important reservoir hosts, the white-footed mouse, peromyscus leucopus. we mimic natural infections in mice using the vector (b ...201120569016
linking disease and community ecology through behavioural indicators: immunochallenge of white-footed mice and its ecological impacts.1. pathogens and immune challenges can induce changes in host phenotype in ways that indirectly impact important community interactions, including those that affect host-pathogen interactions. 2. to explore host behavioural response to immune challenge, we exposed wild white-footed mice (peromyscus leucopus) to an immunogen from an endemic, zoonotic pathogen, the spirochete borrelia burgdorferi. white-footed mice are a major reservoir host of lyme disease (ld) spirochetes in northeastern usa and ...201120796206
rapid, pervasive genetic differentiation of urban white-footed mouse (peromyscus leucopus) populations in new york city.we investigated genetic diversity and structure of urban white-footed mouse, peromyscus leucopus, populations in new york city (nyc) using variation at 18 microsatellite loci. white-footed mice are 'urban adapters' that occur at higher population densities as habitat fragments are reduced in area but have a limited ability to disperse through urbanized areas. we hypothesized that this combination of traits has produced substantial genetic structure but minimal loss of genetic variation over the ...201020819163
cranial shape varies along an elevation gradient in gambel's white-footed mouse (peromyscus maniculatus gambelii) in the grinnell resurvey yosemite transect.environmental variation over a species's range creates differing pressures to which organisms must adjust in order to survive. taxa can respond to these pressures at population and individual levels, leading to localized phenotypic differentiation. assessing the spatial distribution of phenotypic variation can illuminate how dramatically varying environmental factors shape phenotypes and may forecast a taxon's ability to adapt should conditions change. we characterized morphological variation al ...201020623653
molecular epidemiology of powassan virus in north america.powassan virus (pow) is a tick-borne flavivirus distributed in canada, the northern usa and the primorsky region of russia. pow is the only tick-borne flavivirus endemic to the western hemisphere, where it is transmitted mainly between ixodes cookei and groundhogs (marmota monax). deer tick virus (dtv), a genotype of pow that has been frequently isolated from deer ticks (ixodes scapularis), appears to be maintained in an enzootic cycle between these ticks and white-footed mice (peromyscus leucop ...201020631087
variation in levels of luteinizing hormone and reproductive photoresponsiveness in a population of white-footed mice (peromyscus leucopus).natural genetic variation in reproduction and life history strategies is a manifestation of variation in underlying regulatory neuronal and endocrine systems. a test of the hypothesis that genetic variation in luteinizing hormone (lh) level could be related to a life history trait, seasonal reproduction, was conducted on artificial selection lines from a wild-source population of white-footed mice (peromyscus leucopus). variation exists in the degree of suppression of reproduction by winter shor ...201020357020
estrous phase alters social behavior in a polygynous but not a monogamous peromyscus species.the social organization of rodent species determines behavioral patterns for both affiliative and agonistic encounters. the neuropeptide oxytocin has been implicated in the mediation of social behavior; however, variability in both neuropeptide expression and social behavior within a single species indicates an additional mediating factor. the purpose of the present comparative study was to investigate social behaviors in naïve mixed-sex pairs of monogamous peromyscus californicus and polygynous ...201020382149
effects of genetic captive-breeding protocols on sperm quality and fertility in the white-footed mouse.mice (peromyscus leucopus noveboracensis) from a captive-breeding program were used to test the effects of three genetic breeding protocols (minimizing mean kinship [mk], random breeding, and selection for docility [doc]) and inbreeding levels on sperm traits and fertility. earlier, in generation 8, one doc replicate went extinct because of poor reproductive success. by generation 10, spermatozoa from doc mice had more acrosome and midpiece abnormalities, which were shown to be strong determinan ...201020519695
bitter avoidance in guinea pigs (cavia porcellus) and mice (mus musculus and peromyscus leucopus).rejection of bitter substances is common in many species and may function to protect an animal from ingestion of bitter-tasting toxins. since many plants are bitter, it has been proposed that high tolerance for bitterness would be adaptive for herbivores. earlier studies conducted on herbivorous guinea pigs (cavia porcellus) have been used to support this proposal. we tested guinea pigs with bitter plant secondary metabolites (salicin, caffeine, quinine hydrochloride) and bitter protein hydrolys ...201021090891
activation of group ivc phospholipase a(2) by polycyclic aromatic hydrocarbons induces apoptosis of human coronary artery endothelial cells.exposure to environmental pollutants, such as polycyclic aromatic hydrocarbons (pahs) found in coal tar mixtures and tobacco sources, is considered a significant risk factor for the development of heart disease in humans. the goal of this study was to determine the influence of pahs present at a superfund site on human coronary artery endothelial cell (hcaec) phospholipase a(2) (pla(2)) activity and apoptosis. extremely high levels of 12 out of 15 epa high-priority pahs were present in both the ...201021132278
photoperiod-mediated impairment of long-term potention and learning and memory in male white-footed mice.adult mammalian brains are capable of some structural plasticity. although the basic cellular mechanisms underlying learning and memory are being revealed, extrinsic factors contributing to this plasticity remain unspecified. white-footed mice (peromyscus leucopus) are particularly well suited to investigate brain plasticity because they show marked seasonal changes in structure and function of the hippocampus induced by a distinct environmental signal, viz., photoperiod (i.e. the number of hour ...201021145376
microevolution of neuroendocrine mechanisms regulating reproductive timing in peromyscus leucopus.a key question in the evolution of life history and in evolutionary physiology asks how reproductive and other life-history traits evolve. genetic variation in reproductive control systems may exist in many elements of the complex inputs that can affect the hypothalamic-pituitary-gonadal (hpg) or reproductive axis. such variation could include numbers and other traits of secretory cells, the amount and pattern of chemical message released, transport and clearance mechanisms, and the number and o ...200921665840
response to enrichment, type and timing: small mammals vary in their response to a springtime cicada but not a carbohydrate pulse.1. masting events in the autumn provide a carbohydrate-rich pulse of resources that can influence the dynamics of small mammals and their natural enemies. similar patterns are observed with the periodical cicada emergence which provides a protein-rich pulse in the spring, but comparisons are confounded by timing and food type. 2. we compared the influence of a naturally occurring spring pulse of cicadas with an experimental spring pulse of carbohydrate-rich seeds. we used a replicated population ...200918684131
bayou virus detected in non-oryzomyine rodent hosts: an assessment of habitat composition, reservoir community structure, and marsh rice rat social dynamics.in the united states, bayou virus (bayv) ranks second only to sin nombre virus (snv) in terms of hantavirus pulmonary syndrome (hps) incidents, having been confirmed in cases from texas and louisiana since its discovery in 1994. this study on bayv infection among sympatric, non-oryzomyine rodents ("spillover") in freeport, tx, is the first to link patterns of hantavirus interspecific spillover with the spatiotemporal ecology of the primary host (marsh rice rat, oryzomys palustris). mark-recaptur ...200920836801
transovarial transmission of francisella-like endosymbionts and anaplasma phagocytophilum variants in dermacentor albipictus (acari: ixodidae).dermacentor albipictus (packard) is a north american tick that feeds on cervids and livestock. it is a suspected vector of anaplasmosis in cattle, but its microbial flora and vector potential remain underevaluated. we screened d. albipictus ticks collected from minnesota white-tailed deer (odocoileus virginianus) for bacteria of the genera anaplasma, ehrlichia, francisella, and rickettsia using polymerase chain reaction (pcr) gene amplification and sequence analyses. we detected anaplasma phagoc ...200919496436
managing japanese barberry (ranunculales: berberidaceae) infestations reduces blacklegged tick (acari: ixodidae) abundance and infection prevalence with borrelia burgdorferi (spirochaetales: spirochaetaceae).in many connecticut forests with an overabundance of white-tailed deer (odocoileus virginianus zimmermann), japanese barberry (berberis thunbergii dc) has become the dominant understory shrub, which may provide a habitat favorable to blacklegged tick (ixodes scapularis say) and white-footed mouse (peromyscus leucopus rafinesque) survival. to determine mouse and larval tick abundances at three replicate sites over 2 yr, mice were trapped in unmanipulated dense barberry infestations, areas where b ...200919689875
alternate pathway of infection with hepatozoon americanum and the epidemiologic importance of predation.the range of american canine hepatozoonosis (ach) is expanding from the southern usa northward. transmission of hepatozoon americanum occurs by ingestion of infected gulf coast ticks, amblyomma maculatum. the source of the protozoan for the tick remains undetermined; infected dogs are unusual hosts for the tick.200919709355
helicobacter spp. in wild mice (peromyscus leucopus) found in laboratory animal facilities.wild rodents are a potential source for pathogen introduction into laboratory animal research facilities. a study was designed to assess wild mice found at our institution by infectious disease surveillance. wild white-footed mice (peromyscus leucopus) were captured with live capture traps placed in areas in which wild mice had been reported in several animal facilities. captured animals were euthanized by inhalation of co(2), blood was collected by cardiocentesis (n = 10), and necropsy was perf ...200919930823
spatial synchrony propagates through a forest food web via consumer-resource interactions.in many study systems, populations fluctuate synchronously across large regions. several mechanisms have been advanced to explain this, but their importance in nature is often uncertain. theoretical studies suggest that spatial synchrony initiated in one species through moran effects may propagate among trophically linked species, but evidence for this in nature is lacking. by applying the nonparametric spatial correlation function to time series data, we discover that densities of the gypsy mot ...200919967854
niche partitioning of borrelia burgdorferi and borrelia miyamotoi in the same tick vector and mammalian reservoir species.the lyme borreliosis agent borrelia burgdorferi and the relapsing fever group species borrelia miyamotoi co-occur in the united states. we used species-specific, quantitative polymerase chain reaction to study both species in the blood and skin of peromyscus leucopus mice and host-seeking ixodes scapularis nymphs at a connecticut site. bacteremias with b. burgdorferi or b. miyamotoi were most prevalent during periods of greatest activity for nymphs or larvae, respectively. whereas b. burgdorferi ...200919996447
[ehrlichiosis/anaplasmosis].ehrlichiosis and anaplasmosis are zoonoses caused by bacteria from the family anaplasmataceae, including human and animal pathogens. the human pathogens are ehrlichia chaffeensis, the causative agent of human monocytic ehrlichiosis (hme), anaplasma phagocytophilum, the pathogen causing human granulocytic anaplasmosis (hga), e. ewingii and neorickettsia sennetsu, granulocytotropic and monocytotropic ehrlichia species, respectively. ehrlichia spp. are small, gram-negative, obligate intracellular b ...200920077398
enrichment and photoperiod interact to affect spatial learning and hippocampal dendritic morphology in white-footed mice (peromyscus leucopus).in seasonally changing environments, individuals must coordinate endogenous processes with ambient conditions. winter is a challenging time to survive and reproduce. in order to anticipate decreased food availability and low temperatures in winter, many rodents use decreasing day lengths as a precise temporal cue. short day lengths alter several adaptations, including reproduction, immune function, aggressive behavior and spatial learning in non-tropical rodents. specifically, short days impair ...200919120443
protein hydrolysates are avoided by herbivores but not by omnivores in two-choice preference tests.the negative sensory properties of casein hydrolysates (hc) often limit their usage in products intended for human consumption, despite hc being nutritious and having many functional benefits. recent, but taxonomically limited, evidence suggests that other animals also avoid consuming hc when alternatives exist.200919122811
longevity is associated with increased vascular resistance to high glucose-induced oxidative stress and inflammatory gene expression in peromyscus leucopus.vascular aging is characterized by increased oxidative stress and proinflammatory phenotypic alterations. metabolic stress, such as hyperglycemia in diabetes, is known to increase the production of ros and promote inflammatory gene expression, accelerating vascular aging. the oxidative stress hypothesis of aging predicts that vascular cells of long-lived species exhibit lower steady-state production of ros and/or superior resistance to the prooxidant effects of metabolic stress. we tested this h ...200919181967
quantifying a dynamic risk landscape: heterogeneous predator activity and implications for prey persistence.spatial heterogeneity in predation risk can ameliorate impacts on prey populations, particularly for prey of generalists. spatially heterogeneous risk implies the existence of refugia, and the spatial scale of those refugia and their persistence over time affect whether prey can avoid predation by aggregating therein. our objective was to quantify the magnitude, spatial scale, and temporal persistence of heterogeneity in risk of predation by white-footed mice (peromyscus leucopus), an abundant g ...200919294929
factors associated with the risk of giardia species infection in two sympatric species of peromyscus mice.an epidemiologic case-control study was conducted to identify factors that predispose peromyscus spp. to the risk of infection with giardia sp. in watersheds. a total of 200 giardia sp.-positive mice (cases) and a similar number of giardia sp.-negative mice (controls) were selected from a population 2,528 mice captured in a watershed in southeastern new york state. the giardia sp. infection status of the mice was determined by centrifugation concentration flotation and an enzyme-linked immunosor ...200919366280
male hosts are responsible for the transmission of a trophically transmitted parasite, pterygodermatites peromysci, to the intermediate host in the absence of sex-biased infection.field studies have identified that male-biased infection can lead to increased rates of transmission, so we examined the relative importance of host sex on the transmission of a trophically transmitted parasite (pterygodermatites peromysci) where there is no sex-biased infection. we experimentally reduced infection levels in either male or female white-footed mice (peromyscus leucopus) on independent trapping grids with an anthelmintic and recorded subsequent infection levels in the intermediate ...200919397911
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