| locations of moose in northwestern canada with hair loss probably caused by the winter tick, dermacentor albipictus (acari: ixodidae). | five hundred two trappers representing 389 registered traplines in northern alberta, northern british columbia, northwest territories and yukon territory (canada) responded to a questionnaire on the occurrence of hair loss and the winter tick (dermacentor albipictus) on moose (alces alces). results suggested that winter ticks may occur as far as 62 degrees n. several sightings of moose with presumed tick-induced hair loss near kluane lake, yukon territory, suggest the possibility of introduction ... | 1989 | 2761020 |
| factors affecting transmission of larval winter ticks, dermacentor albipictus (packard), to moose, alces alces l., in alberta, canada. | the larval stage of the winter tick, dermacentor albipictus, was studied under field conditions in central alberta, canada. larvae ascended vegetation in autumn, possibly in response to photoperiod. numbers found by flagging increased from early september to early october and decreased gradually to zero by december. larvae clumped on the tips of vegetation approximately 1-1.5 m off the ground, and did not exhibit a diurnal, vertical migration. activity was temperature dependent and no obvious pr ... | 1985 | 4032625 |
| an evaluation of burning for control of winter ticks, dermacentor albipictus, in central alberta. | | 1985 | 4032634 |
| differential effects of photoperiod on development and reproduction in "montane" and "prairie" strains of the rocky mountain wood tick (acari: ixodidae). | progeny of dermacentor andersoni stiles adults collected from one "montane" and two "prairie" sites in southern alberta, canada, were exposed to combinations of 9:15, 11:13 and 13:11 (l:d) daily photoperiods during various stages of their life cycle. time required for developmental and reproductive events was recorded. significant differences in mean molting times of fed larvae were observed, yet the differences were small, and mean times were not attributed to photoperiodic regime. fed nymphal ... | 1991 | 2033610 |
| differences in paralyzing ability and sites of attachment to cattle of rocky mountain wood ticks (acari: ixodidae) from three regions of western canada. | | 1985 | 3981550 |
| dermacentor albipictus (acari, ixodidae) on captive reindeer and free-ranging woodland caribou. | infestations of winter ticks (dermacentor albipictus) on two captive reindeer (rangifer tarandus tarandus) are reported and may be associated with increased grooming and alopecia. over 400,000 ticks were recovered from one reindeer. few ticks (less than 25 ticks/animal) were found on three free-ranging woodland caribou (rangifer tarandus caribou). | 1990 | 1974936 |
| increasing the paralyzing ability of a laboratory colony of dermacentor andersoni stiles. | field-collected rocky mountain wood ticks dermacentor andersoni stiles from british columbia caused limited paralysis in hamsters at high doses, but not at lower doses, while ticks collected from alberta failed to cause paralysis. this prompted development of a laboratory strain of ticks with a more consistent ability to cause paralysis. progeny of ticks that paralyzed a cow near walhachin, british columbia were reared and assayed for paralyzing ability. a high-virulence colony was selected for ... | 2003 | 12693847 |
| difference of sites of attachment of dermacentor andersoni stiles to cattle in southeastern alberta and in south central british columbia, in relation to possible existence of genetically different strains of ticks. | | 1965 | 14328661 |
| a canadian bison isolate of anaplasma marginale (rickettsiales: anaplasmataceae) is not transmissible by dermacentor andersoni (acari: ixodidae), whereas ticks from two canadian d. andersoni populations are competent vectors of a u.s. strain. | anaplasma marginale theiler is a tick-borne rickettsial pathogen of cattle with a global distribution in both temperate and tropical regions. the pathogen is endemic in regions within the united states, whereas the canadian cattle population is considered to be free ofa. marginale. farmed bison, bison bison l., in central saskatchewan have been found to be infected with a. marginale; however, there is no evidence of transmission from bison to cattle. we tested a saskatchewan bison isolate of a. ... | 2006 | 17017236 |
| abnormal morphology of an adult rocky mountain wood tick, dermacentor andersoni (acari: ixodidae). | during a collection of ticks from vegetation in march 2006, a single adult male rocky mountain wood tick, dermacentor andersoni (stiles, 1908), was collected that exhibited unique morphological anomalies, including the absence of a leg on the right side of the body. coxa iv on the right side also was missing in this specimen. such teratological changes have not been reported previously for d. andersoni. | 2007 | 17626369 |
| reproductive compatibility of prairie and montane populations of dermacentor andersoni. | genetic analysis of prairie and montane populations of dermacentor andersoni (stiles) originating from alberta (ab) and british columbia (bc), canada, respectively, indicated limited gene flow (nm <1) and a large amount of genetic differentiation (fst = 0.49) between the populations. the prairie population also had a greater level of genetic diversity. mating experiments indicated that females of geographically heterogeneous crosses had similar engorgement and oviposition failure as homogenous c ... | 2008 | 19058630 |
| deep mitochondrial dna lineage divergences within alberta populations of dermacentor albipictus (acari: ixodidae) do not indicate distinct species. | the winter tick dermacentor albipictus (packard) has a single-host life cycle that allows it to reach severe infestation levels on ungulates, particularly moose. genotypic variation within these and related ticks has been a source of taxonomic confusion, although the continuity in their morphology and life history has generally been interpreted as indicating the existence of a single species. to further investigate this variation, we sequenced regions of two mitochondrial dna (mtdna) genes (coi ... | 2010 | 20695271 |
| genetic variation in the 16s mitochondrial dna gene of two canadian populations of dermacentor andersoni (acari: ixodidae). | the rocky mountain wood tick, dermacentor andersoni stiles, 1908, is of medical and veterinary importance because it can transmit pathogenic agents to humans, domestic livestock, and wildlife. the preferred attachment sites of d. andersoni adults and their ability to induce paralysis in hosts vary among populations, which may have a genetic basis. in this study, polymerase chain reaction (pcr)-single-strand conformation polymorphism (sscp) analyses and dna sequencing were used to determine the g ... | 2009 | 19496416 |