Abstract
The life cycle of Ixodes luciae was evaluated for five consecutive generations in the laboratory. Wild mice Calomys callosus and laboratory rats Rattus norvegicus were used as hosts for larvae and nymphs. For adult ticks, opossums Didelphis aurita were used as hosts. Off-host developmental periods were observed in an incubator at 27°C and 95% RH. The life cycle of I. luciae lasted 95–97 days, excluding prefeeding periods. C. callosus, one of the natural host species for I. luciae immature stages, was shown to be much more suitable than the artificial host R. norvegicus. Significantly (P < 0.05), more larvae and nymphs successfully fed on C. callosus than on R. norvegicus. When tick-naïve C. callosus were exposed to three consecutive larval infestations at 24-day intervals, recovery of engorged larvae were greater in the second and third infestations, indicating that previous infestations did not induce acquired resistance to ticks. Larval feeding period typically varied from 5 to 10 days on R. norvegicus, but was significantly (P < 0.05), longer on C. callosus (range, 7–34 days). The majority (71.7%) of I. luciae adult females successfully fed and oviposited after exposed to D. aurita. Mean engorged weight (581.9 mg; range, 237.1–796.0 mg) of these females were much higher than those previously reported for other New World Ixodes species. Our results are in accordance to the current literature that appoints opossums Didelphidae and small rodents (e.g., C. callosus) natural hosts for I. luciae immature and adult stages, respectively.
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Acknowledgements
We thank Pedro Cesar Nogueira da Silva and Thomas Bronhall for technical assistance with animals. This work was supported by Fundação de Amparo a Pesquisa de São Paulo and Conselho Nacional de Desenvolvimento Científico e Tecnológico.
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Labruna, M.B., Cabrera, R.R. & Pinter, A. Life cycle of Ixodes luciae (Acari: Ixodidae) in the laboratory. Parasitol Res 105, 1749–1753 (2009). https://doi.org/10.1007/s00436-009-1621-8
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DOI: https://doi.org/10.1007/s00436-009-1621-8