Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe
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 dr...
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2018
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| Online Access: | http://hdl.handle.net/11408/3224 |
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| author | Sungirai, Marvelous Baron, Samantha Van der Merwe, Nicolaas A. De Clercq, Patrick Maritz-Olivier, Christine Madder, Maxime |
| author_facet | Sungirai, Marvelous Baron, Samantha Van der Merwe, Nicolaas A. De Clercq, Patrick Maritz-Olivier, Christine Madder, Maxime |
| author_sort | Sungirai, Marvelous |
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| description | 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 (He) 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. |
| format | Article |
| id | ir-11408-3224 |
| institution | My University |
| language | English |
| publishDate | 2018 |
| publisher | Elsevier |
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| spelling | ir-11408-32242022-06-27T13:49:06Z Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe Sungirai, Marvelous Baron, Samantha Van der Merwe, Nicolaas A. De Clercq, Patrick Maritz-Olivier, Christine Madder, Maxime Rhipicephalus microplus Population genetics Microsatellites 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 (He) 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. https://doi.org/10.1016/j.actatropica.2018.01.003 2018-10-02T10:17:23Z 2018-10-02T10:17:23Z 2018 Article 0001-706X http://hdl.handle.net/11408/3224 en Acta Tropica;Vol. 180: p. 42-46 open Elsevier |
| spellingShingle | Rhipicephalus microplus Population genetics Microsatellites Sungirai, Marvelous Baron, Samantha Van der Merwe, Nicolaas A. De Clercq, Patrick Maritz-Olivier, Christine Madder, Maxime Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title | Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title_full | Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title_fullStr | Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title_full_unstemmed | Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title_short | Population structure and genetic diversity of Rhipicephalus microplus in Zimbabwe |
| title_sort | population structure and genetic diversity of rhipicephalus microplus in zimbabwe |
| topic | Rhipicephalus microplus Population genetics Microsatellites |
| url | http://hdl.handle.net/11408/3224 |
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