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dermacentor albipictus on moose (alces alces) in ontario.fifty-five moose (alces alces) collected from 1963 to 1965 in the chapleau crown game preserve of northern ontario were examined for ectoparasites. dermacentor albipictus was the only parasite recovered. d. albipictus was absent from 15 moose examined during june, july and august; first observed on 1 or 2 moose examined in september; and present on all 38 moose collected from october to may. ticks were not evenly distributed on the body. infestations varied from 32 to 13,490 ticks/moose for 14 i ...1979480519
bioenergetic consequences of alopecia induced by dermacentor albipictus (acari: ixodidae) on moose.fasting metabolic rates, respiration rates, respiratory minute volumes, and fasted weights were measured on three yearling moose (alces alces (l.)) (artiodactyla: cervidae) infested with 50,000 winter ticks. dermacentor albipictus (packard) (acari: ixodidae), and on two uninfested controls. infestations produced no detectable effects on fasting metabolic rates or weight changes. the influence of tick-induced alopecia on lower critical temperatures could not be assessed because of warm temperatur ...19902388241
instar development and disengagement rate of engorged female winter ticks, dermacentor albipictus (acari:ixodidae), following single- and trickle-exposure of moose (alces alces).seven hand-reared moose (alces alces) calves and one yearling were infested with 30,000 larvae each of the winter tick. dermacentor albipictus, either by single- or trickle-exposure (1000/day). they were examined weekly for instar changes from september/october until late may. by 2 and 3 weeks post-exposure, most larvae on single- and trickle-infested moose, respectively, had fed and molted to nymphs. thereafter, tick development was similar between both infestation techniques. nymphs dominated ...19892714120
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 ...19892761020
erysipelothrix rhusiopathiae, serotype 17, septicemia in moose (alces alces) from algonquin park, ontario.erysipelothrix rhusiopathiae septicemia was diagnosed in three of four moose found dead in algonquin provincial park, ontario, canada, in the spring of 1989. type 17 e. rhusiopathiae was isolated from liver, lung, kidney, and lymph nodes of affected animals, which were in poor body condition, and suffering hair loss associated with tick (dermacentor albipictus) infestations. microscopic lesions consisted of mild, multifocal, necrotizing myocarditis, sarcocystosis, and lymph node atrophy. the bac ...19947933291
climbing simulated vegetation to heights of ungulate hosts by larvae of dermacentor albipictus (acari: ixodidae).larvae of winter ticks, dermacentor albipictus (packard), ascend vegetation in autumn and form clumps that attach to passing ungulate hosts. we tested the hypothesis that vegetation height determines the height of clumps. during the vegetation-to-ungulate transmission period (early september to mid-november), larvae were released at the base of simulated vegetation (nylon rods 245 cm tall) in outdoor and laboratory trials and in the absence of host cues. rod height exceeded the height of the tal ...200015218914
the biological basis of grooming in moose: programmed versus stimulus-driven grooming.in domestic and wild mammals, tick infestation can be a significant fitness cost. grooming behaviour has been shown to be effective in removing ticks. we studied grooming by moose, alces alces, infested with winter ticks, dermacentor albipictus, to determine which of two nonexclusive models for the regulation of tick-removal grooming, programmed or stimulus driven, best fit this host-parasite relationship. the programmed grooming model states that most grooming is driven by an internal timing me ...19989933554
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 ...19854032625
tick (dermacentor albipictus)-induced winter hair-loss in captive moose (alces alces).five captive moose calves each infested with 42,000 larval dermacentor albipictus, six calves each infested with 19,000-21,000, and five control moose were observed for changes in hair-loss, body condition and number, stages, and distribution of the tick. winter hair-loss was observed only in moose infested with ticks and was correlated positively with the total number of adult ticks. hair-loss associated with ticks was minimal from october to january, but rapidly increased from february to apri ...19863503137
growth and development of winter tick, dermacentor albipictus, on moose, alces alces.moose, alces alces, were infested with 21,000 or 42,000 larval dermacentor albipictus at the end of september. larvae grew rapidly and molted to the nymphal stage 10-22 days after infestation. the nymphal stage lasted approximately 3 mo until mid-january and was characterized by a diapause. the diapause is likely an adaptation to survival in cold climates. nymphs started engorging in january and adults were seen with increasing abundance from mid-january to march and april. the minimum parasitic ...19883397828
evaluation of random sampling for estimating density of winter ticks (dermacentor albipictus) on moose (alces alces) hides.densities of winter ticks (dermacentor albipictus) were determined on each of 20 moose (alces alces) half-hides by dissolving 100 cm2 quadrats in potassium hydroxide solution. data were then used to determine the optimum sampling fraction for estimating tick densities. random sampling was applied to 20 additional half-hides of known tick density to assess the accuracy of the estimates. we conclude that random sampling of 15% of the quadrats produces a good estimate of tick density. total numbers ...19892807724
effect of dermacentor albipictus (acari:ixodidae) on blood composition, weight gain and hair coat of moose, alces alces.the physiological effects of the winter tick, dermacentor albipictus, on moose, alces alces, were investigated. blood composition, weight gain, food intake and change in the hair coat of moose calves, four infested with d. albipictus larvae, and eight uninfested, were monitored. infested moose groomed extensively, apparently in response to feeding nymphal and adult ticks, and developed alopecia. other clinical signs included: chronic weight loss, anemia, hypoalbuminemia, hypophosphatemia, and tr ...19892714121
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