| 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 |
| 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 |
| 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 |