Results 171 to 180 of about 19,409 (219)

Parthenogenetic Reproduction by Dermacentor variabilis (Acarina: Ixodidae)

Annals of the Entomological Society of America, 1971
Female American dog ticks, Dermacentor variabilis (Say), that fed on a bovine in the absence of males engorged, detached, and produced larvae parthenogenetically. These engorged virgin females weighed significantly less than mated females and also laid significantly smaller egg masses.
William J. Gladney, Charles C. Dawkins
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Distribution of Dermacentor andersoni Stiles and Dermacentor variabilis (Say) (Acari: Ixodidae) in western Canada based on active surveillance.

Journal of medical entomology
A total of 454 unique sites in western Canada were drag sampled for host-seeking Dermacentor species. Dermacentor andersoni Stiles was detected in British Columbia, Alberta, and Saskatchewan, while D.
S. Dergousoff, Timothy J Lysyk, K. Rochon, Neil B. Chilton   +3 more
semanticscholar   +1 more source

Underwater survival in the dog tick Dermacentor variabilis (Acari:Ixodidae)

Journal of Insect Physiology, 2011
Ticks are blood-feeding arthropods known for their long survivability off the host. Although ticks are terrestrial, they can survive extended periods of time submerged underwater. A plastron is an alternative respiration system that can absorb oxygen from water via a thin layer of air trapped by hydrophobic hairs or other cuticular projections.
Laura J, Fielden, Lisa M, Knolhoff, Susan M, Villarreal, Philip, Ryan   +3 more
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Attempted Ehrlichia risticii Transmission with Dermacentor variabilis (Acari: Ixodidae)

Journal of Medical Entomology, 1990
Larval Dermacentor variabilis (Say) (n = 327) were fed on Balb/C mice inoculated with Ehrlichia risticii, the etiologic agent of equine monocytic ehrlichiosis (Potomac horse fever). All mice displayed clinical signs of E. risticii infection at the time of feeding. After molting, resulting nymphs (n = 74) were fed on susceptible mice.
J F, Levine, M G, Levy, W L, Nicholson, R B, Gager   +3 more
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Three Molecules Found in Rosemary or Nutmeg Essential Oils Repel Ticks (Dermacentor variabilis) more Effectively than DEET in a Non-human Assay.

Pest Management Science, 2020
BACKGROUND Development of new personal repellents to prevent tick bites is progressing to keep up with the increasing threat of tick-borne diseases in humans. However, the market share of natural, plant-based repellents is still quite small.
Colin R. Wong, Kylie Crystal, J. Coats
semanticscholar   +1 more source

Marking Dermacentor variabilis (Acari: Ixodidae) with Rubidium

Journal of Medical Entomology, 1994
Studies were conducted to determine the feasibility of marking Dermacentor variabilis (Say) with the alkali metal rubidium (Rb) by feeding larvae on mice that were injected with rubidium chloride (RbCl). Newly molted nymphs that fed as larvae for 2 to 5 d on RbCl-injected mice contained approximately 660 parts per billion (ppb) of Rb, whereas nymphs ...
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Dermacentor variabilis

25. Dermacentor variabilis (Say, 1821). ND: ND, ND (Tovar 1945). Matamoros: (1F, 1M, CNAC002240) ND, Lynx rufus Schreber (Guzmán-Cornejo et al. 2016). Reynosa: ND, ND (Sánchez-Cordero et al. 2021) 3; (2F, 1M, CNAC002150) Los Tres García, C. lupus familiaris (Guzmán-Cornejo et al. 2016; Chaires-Grijalva & Acuña-Soto 2024) 1, 2,3. San Fernando: Rancho El
Rodríguez-García, Iram Emmanuel, Coronado-Blanco, Juana María, Garrido-Olvera, Lorena, Guzmán-Cornejo, Carmen, López-Aguirre, Daniel, Estrada-Drouaillet, Benigno, Niño-Maldonado, Santiago, Guerra-Pérez, Antonio   +7 more
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Interactions between Rickettsiae andDermacentor variabilisTicks

Annals of the New York Academy of Sciences, 2003
Abstract:Tick‐borne spotted fever group rickettsiae are maintained in nature primarily through transstadial and transovarial transmission in their vector. In the tick,Dermacentor variabilis, the infection of, and persistence within, the ovaries are critical steps in the transmission cycle of rickettsiae from one generation to the next.
Kevin R, Macaluso, Albert, Mulenga, Jason A, Simser, Abdu F, Azad   +3 more
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Absence of Assembly Pheromones in the Hard Ticks Dermacentor variabilis and Dermacentor andersoni (Acari: Ixodidae)

Journal of Medical Entomology, 1987
There was no evidence of response to an assembly pheromone when male and female Dermacentor variabilis (Say) and Dermacentor andersoni Stiles were exposed in petri dish assays to filter paper circles contaminated by other ticks (either conspecific or heterospecific), hexane extracts of ticks, tick feces, or tick excreta. These ticks did not assemble in
D, Taylor, J S, Phillips, S A, Allan, D E, Sonenshine   +3 more
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Dermacentor variabilis: Acquired resistance to ticks in BALB/c mice

Experimental Parasitology, 1985
To assess the ability of Dermacentor variabilis larvae to feed on mice during repeated infestations, known numbers of larvae were confined to the skin of BALB/c mice within plastic capsules, and different skin sites were used in four successive infestations.
N, denHollander, J R, Allen
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