Population genetic structure of the elephant tick Amblyomma tholloni from different elephant populations in Kenya

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cg.authorship.typesCGIAR and developing country instituteen
cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationUniversity of Santiago de Compostelaen
cg.contributor.affiliationKenya Wildlife Serviceen
cg.contributor.affiliationWildlife Research and Training Instituteen
cg.contributor.affiliationEgerton Universityen
cg.contributor.affiliationInternational Livestock Research Instituteen
cg.contributor.affiliationDuke Universityen
cg.contributor.affiliationConsejo Superior de Investigaciones Científicas, Spainen
cg.coverage.countryKenyaen
cg.coverage.iso3166-alpha2KEen
cg.coverage.regionAfricaen
cg.coverage.regionEastern Africaen
cg.creator.identifierRichard Nyamota: 0000-0002-9569-1953en
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1016/j.ttbdis.2022.101935en
cg.isijournalISI Journalen
cg.issn1877-959Xen
cg.issue3en
cg.journalTicks and Tick-borne Diseasesen
cg.reviewStatusPeer Reviewen
cg.subject.ilriWILDLIFEen
cg.subject.impactAreaEnvironmental health and biodiversityen
cg.subject.sdgSDG 15 - Life on landen
cg.volume13en
dc.contributor.authorKing'ori, E.M.en
dc.contributor.authorObanda, V.en
dc.contributor.authorNyamota, Richarden
dc.contributor.authorRemesar, S.en
dc.contributor.authorChiyo, P.I.en
dc.contributor.authorSoriguer, R.en
dc.contributor.authorMorrondo, P.en
dc.date.accessioned2022-03-27T16:14:20Zen
dc.date.available2022-03-27T16:14:20Zen
dc.identifier.urihttps://hdl.handle.net/10568/118463
dc.titlePopulation genetic structure of the elephant tick Amblyomma tholloni from different elephant populations in Kenyaen
dcterms.abstractUnderstanding factors that shape tick population genetic structure is important as they may be exploited in crafting strategies for vector control. Amblyomma tholloni, or “elephant tick” is a three-host tick whose adults preferentially parasitize African elephants. The aim of this study was to determine the influence of fragmentation of the host populations on the genetic structure of this tick species from different ecosystems in Kenya, using the second internal transcribed spacer (ITS-2) and mitochondrial cytochrome oxidase 1 (CO1) loci. Population genetic analysis of ticks collected from four elephant populations using ITS-2 and CO1 loci revealed high gene diversity. Gene diversity at the ITS-2 locus was 0.91 and the nucleotide diversity was, 0.01. ITS-2 gene diversity was highest in Laikipia-Samburu ecosystem (0.947) and lowest in Tsavo (0.80). The CO1 locus also had high gene diversity, 0.790, and low nucleotide diversity, 0.006, and like ITS-2, gene diversity was higher in Laikipia-Samburu ecosystem (1.00) and lower in Tsavo (0.286). There was a modest statistically significant genetic differentiation among the four tick populations based on ITS-2 (FST = 0.104, P < 0.001; ΦST = 0.105, P < 0.001), and a 10% of molecular variance attributed to genetic variation between populations. There was also statistically significant differentiation among tick populations using haplotype frequencies for CO1 locus (FST = 0.167, P < 0.001) accounting for 17% of genetic variance among populations, but not modelled genetic distances (ΦST = 0.029, P = 0.095) suggesting very recent genetic differentiation. In addition, populations of A. tholloni in Kenya had a significantly negative Tajima D and Fu & Li's F* and D* at the CO1 locus suggesting recent positive selection. The extensive acaricide use in livestock, which host the larval stage, could be driving purifying selection and genetic hitchhiking of the CO1 locus. However, tests sensitive to demography such as Fu's FS, Ramos-Onsins & Rozas's R2 and raggedness index r were statistically significant at the ITS-2 locus suggesting ancient demographic expansion. Elephant population fragmentation appears to shape the genetic structure of A. tholloni, while agro-ecological factors could influence the genetic diversity of ticks.en
dcterms.accessRightsLimited Accessen
dcterms.audienceAcademicsen
dcterms.audienceScientistsen
dcterms.bibliographicCitationKing'ori, E.M., Obanda, V., Nyamota, R., Remesar, S., Chiyo, P.I., Soriguer, R. and Morrondo, P. 2022. Population genetic structure of the elephant tick Amblyomma tholloni from different elephant populations in Kenya. Ticks and Tick-borne Diseases 13(3): 101935.en
dcterms.extent101935en
dcterms.issued2022-05en
dcterms.languageenen
dcterms.licenseCopyrighted; all rights reserveden
dcterms.publisherElsevieren
dcterms.subjectwildlifeen
dcterms.subjectvectorsen
dcterms.typeJournal Articleen

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