Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe

Marvelous Sungirai, Samantha Baron, Nicolaas A. Van der Merwe, Doreen Zandile Moyo, Patrick De Clercq, Christine Maritz-Olivier, Maxime Madder

    Research output: Contribution to journalA1: Web of Science-article

    Abstract

    Recently there was an expansion in the geographic range of Rhipicephalus microplus in Zimbabwe. In order to understand gene flow patterns and population structure in this highly invasive and adaptable cattle tick, a population genetics study was carried out. Eighty-seven R. microplus tick samples drawn from 5 distinct populations were genotyped using eight polymorphic microsatellite loci. Genetic diversity (HQ) was high (0.755-0.802) in all the populations, suggesting high levels of gene flow with 97% of genetic variation found within populations and 3% amongst populations. No isolation by distance was observed with low but significant genetic differentiation amongst the populations (0-0.076). Most of the sampled individuals had admixed genetic backgrounds, except for those from Matabeleland North whose genetic makeup appeared different from the rest. Rhipicephalus microplus was recently recorded in this area and the environmental conditions do not support survival of the tick there. These results confirm recent range expansion of the tick and the lowest genetic diversity recorded in the Matabeleland North population is suggestive of a founder effect, which may lead to genetic drift. Generally, the very low levels of genetic differentiation amongst the populations could be a result of the frequent movement of livestock from one area to another, which will have implications for disease control. This study offers further opportunities to study evolutionary adaptation of R. microplus in Zimbabwe and southern Africa.

    Original languageEnglish
    JournalActa Tropica
    Volume180
    Pages (from-to)42-46
    Number of pages5
    ISSN0001-706X
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Rhipicephalus microplus
    • Population genetics
    • Microsatellites
    • BOOPHILUS-MICROPLUS
    • PARASITE POPULATIONS
    • MICROSATELLITE LOCI
    • IXODES-RICINUS
    • TICK
    • SOFTWARE
    • CATTLE
    • VECTORS

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