| evaluation of squirrels (rodentia: sciuridae) as ecologically significant hosts for anaplasma phagocytophilum in california. | granulocytic anaplasmosis (ga), caused by anaplasma phagocytophilum, is a potentially fatal, emerging rickettsial disease of humans, domestic animals, and wildlife. the purpose of this study was to determine whether sciurids from multiple areas of northern california were infested with ticks or exposed to or infected with a. phagocytophilum using polymerase chain reaction (pcr) and indirect-fluorescent antibody (ifa) serology. sciurids of nine different tree- and ground-dwelling species were ass ... | 2008 | 18714881 |
| genetic and phenotypic variation across a hybrid zone between ecologically divergent tree squirrels (tamiasciurus). | a hybrid zone along an environmental gradient should contain a clinal pattern of genetic and phenotypic variation. this occurs because divergent selection in the two parental habitats is typically strong enough to overcome the homogenizing effects of gene flow across the environmental transition. we studied hybridization between two parapatric tree squirrels (tamiasciurus spp.) across a forest gradient over which the two species vary in coloration, cranial morphology and body size. we sampled 39 ... | 2011 | 21771139 |
| diversification and gene flow in nascent lineages of island and mainland north american tree squirrels (tamiasciurus). | pleistocene climate cycles and glaciations had profound impacts on taxon diversification in the boreal forest biome. using population genetic analyses with multilocus data, we examined diversification, isolation, and hybridization in two sibling species of tree squirrels (tamiasciurus douglasii and tamiasciurus hudsonicus) with special attention to the geographically and genetically enigmatic population of t. hudsonicus on vancouver island, canada. the two species differentiated only about 500,0 ... | 2014 | 24351034 |
| distribution and diversity of borrelia burgdorferi sensu lato group bacteria in sciurids of california. | california has a remarkable diversity of squirrel and chipmunk species (sciurids), and five named and several unnamed genospecies in the borrelia burgdorferi sensu lato group (bbsl) of bacteria as well, many of which utilize sciurids as reservoirs. we investigated the prevalence, spatial distribution, and diversity of bbsl in sciurids of california by literature search, pcr of 585 ear tissue samples from 15 sciurid species prospectively collected across 19 california counties, and dna sequencing ... | 2017 | 28976820 |
| data from camera surveys identifying co-occurrence and occupancy linkages between fishers (pekania pennanti), rodent prey, mesocarnivores, and larger predators in mixed-conifer forests. | these data provide additional information relevant to the frequency of fisher detections by camera traps, and single-season occupancy and local persistence of fishers in small patches of forest habitats detailed elsewhere, "landscape fuel reduction, forest fire, and biophysical linkages to local habitat use and local persistence of fishers (pekania pennanti) in sierra nevada mixed-conifer forests" [10]. the data provides insight on camera trap detections of 3 fisher predators (bobcat [lynx rufus ... | 2016 | 26937448 |
| differential exposure to anaplasma phagocytophilum in rodent species in northern california. | anaplasma phagocytophilum is a zoonotic tick-borne rickettsial pathogen that causes granulocytic anaplasmosis (ga) in humans, horses, and dogs. in california, dusky-footed woodrats (neotoma fuscipes) are a putative reservoir host, and ixodes pacificus is a vector for transmission from rodents to humans, dogs, and horses. cases are clustered in coastal and sierra nevada foothill regions, but not necessarily in proximity to infected woodrats. this study was designed to compare exposures and active ... | 2008 | 18047398 |
| encephalitic nematodiasis in a douglas squirrel and a rock dove ascribed to baylisascaris procyonis. | | 1995 | 7497427 |
| notes on hypopi of two dermacarus species (acari: astigmata: glycyphagidae) from the douglas squirrel, tamiasciurus douglasii. | | 1977 | 606816 |
| population dynamics and regulation of the douglas squirrel (tamiasciurus douglasii) with supplemental food. | if food is in short supply, then provision of addition food should increase the density of douglas squirrels. a squirrel population was supplied with extra food during the summers of 1977 and 1978 and winter of 1978-1979 in coastal coniferous forest at maple ridge, british columbia. food produced a 5-to 10-fold increase in squirrel density compared with control populations. control densities generally varied from 3 to 10 squirrels per trapping area with the experimental population increasing to ... | 1982 | 28311121 |
| revision of widespread red squirrels (genus: tamiasciurus) highlights the complexity of speciation within north american forests. | integration of molecular methods, ecological modeling, and statistical hypothesis testing are increasing our understanding of differentiation within species and phylogenetic relationships among species by revealing environmental connections to evolutionary processes. within mammals, novel diversity is being discovered and characterized as more complete geographic sampling is coupled with newer multi-disciplinary approaches. north american red squirrels exemplify a forest obligate genus whose spe ... | 2016 | 27083861 |
| plague studies in california: a review of long-term disease activity, flea-host relationships and plague ecology in the coniferous forests of the southern cascades and northern sierra nevada mountains. | we review 28 years of long-term surveillance (1970-1997) for plague activity among wild rodents from ten locations within three coniferous forest habitat types in the northern sierra nevada and the southern cascade mountains of northeastern california. we identify rodent hosts and their fleas and document long-term plague activity in each habitat type. the highest seroprevalence for yersinia pestis occurred in the chipmunks, tamias senex and t. quadrimaculatus, and the pine squirrel, tamiasciuru ... | 2010 | 20618641 |
| coinfection of western gray squirrel (sciurus griseus) and other sciurid rodents with borrelia burgdorferi sensu stricto and anaplasma phagocytophilum in california. | overlapping geographic distributions of tick-borne disease agents utilizing the same tick vectors are common, and coinfection of humans, domestic animals, wildlife, and ticks with both borrelia burgdorferi and anaplasma phagocytophilum has been frequently reported. this study was undertaken in order to evaluate the prevalence of both b. burgdorferi sensu stricto (hereinafter referred to as b. burgdorferi) and a. phagocytophilum in several species of sciurid rodents from northern california, usa. ... | 2010 | 20090047 |
| borrelia burgdorferi and anaplasma phagocytophilum genospecies in northern california. | the sensu lato (s.l.) complexes of borrelia burgdorferi and anaplasma phagocytophilum include pathogenic genospecies each with distinct ecologies in northern california, yet, most work conflates the genospecies of each pathogen into one sensu lato species. detailed understanding of the differences in geographic distributions and ecology among genospecies is lacking. we aimed to evaluate whether two b. burgdorferi and two a. phagocytophilum genospecies in high-risk locations in coastal northern c ... | 2020 | 32155394 |