Abstract
Studies in the biology, ecology and behaviour of R. appendiculatus in Zambia have shown considerable variation within and between populations often associated with their geographical origin. We studied variation in the mitochondrial COI (mtCOI) gene of adult R. appendiculatus ticks originating from the Eastern and Southern provinces of Zambia. Rhipicephalus appendiculatus ticks from the two provinces were placed into two groups on the mtCOI sequence data tree. One group comprised all haplotypes of specimens from the Eastern province plateau districts of Chipata and Petauke. The second group consisted of a single haplotype of specimens from the Southern province districts and Nyimba, an Eastern province district on the fringes of the valley. This variation provides additional evidence to the earlier observations in the 12S rDNA and ITS2 data for the geographic subdivision of R. appendiculatus from Southern province and Eastern province plateau. The geographic subdivision further corresponds with differences in body size and diapause between R. appendiculatus from these geographic areas. The possible implications of these findings on the epidemiology of East Coast fever (ECF) the disease for which R. appendiculatus is one of the vectors are discussed.
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Acknowledgements
This work was funded by the Belgian Technical Co-operation through the “Assistance to the Veterinary Services of Zambia (ASVEZA) project in the Southern Province. We thank the farmers of the two provinces for their co-operation. Special thanks to Mr Geff Mukwalantila without whose commitment collections from Petauke and Nyimba would have not been possible.
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Nucleotide sequence data reported in this paper are available in the GenBankTM under the Accession Numbers DQ859259–DQ859266
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Mtambo, J., Madder, M., Van Bortel, W. et al. Further evidence for geographic differentiation in R. appendiculatus (Acari: Ixodidae) from Eastern and Southern provinces of Zambia. Exp Appl Acarol 41, 129–138 (2007). https://doi.org/10.1007/s10493-007-9049-2
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DOI: https://doi.org/10.1007/s10493-007-9049-2