Climate changes and suitability for the ticks Amblyomma hebraeum and Amblyomma variegatum (Ixodidae) in Zimbabwe (1974–1999)

Show simple item record Estrada-Pena, Agustín Horak, Ivan Gerard Petney, Trevor N.
dc.coverage.spatial Zimbabwe en
dc.coverage.spatial Africa en 2009-01-19T08:27:47Z 2009-01-19T08:27:47Z 2008-02
dc.description.abstract The spread of Amblyomma hebraeum has been reported in Zimbabwe. At the same time there was little or no spread in the distribution of Amblyomma variegatum. This paper examines the climatic cycles and their trends in the period 1974–1999 with a view to explaining the abiotic causes of this spread, and of forecasting the likely tendency in climate suitability for both tick species. An annual data-set of rainfall and air temperature was used as a source for climate, together with a habitat-modeling algorithm to estimate climate suitability for both ticks. Long-term suitable habitat for A. hebraeum exists mainly in the south and southeast of the country. Areas of adequate habitat for A. variegatum exist across the country, between approximately 17°S and 18.5°S, and are most suitable in regions of the northwest. The climate niches of the two species differ, and account for their almost allopatric distributions, as observed in the duration and intensity of the dry period and in total annual rainfall. Cyclic changes in both temperature and rainfall drive the periodic modifications in the distributions of the ticks. More intense periods of drought in the highveld, drive the expansion of A. hebraeum in this region. Temperature does not have any effect on the tendency in this area. Areas in south and southeast show a trend towards an increase in climatic suitability because of an increase in temperature. Zones in which habitat suitability is increasing for A. variegatum are restricted to the northwestern parts of the country, because warmer temperatures and a slight decrease in the intensity of the dry season. The progressive increase in temperatures seems to be forcing the dispersion of A. variegatum towards areas outside of zones that have a prolonged dry period. On the other hand A. hebraeum is compelled to spread northwards, following areas with adequate rainfall patterns, but halted by temperature limits and perhaps competition with A. variegatum. Without adequate control measures, invasive waves of A. hebraeum may occur over a background swell of northward expansion. en_US
dc.description.sponsorship International Cooperation Programme of the European Union through Coordination Action Project no. 510561 en_US
dc.identifier.citation Estrada-Pena, A, Horak, IG & Petney, T 2008, ‘Climate changes and suitability for the ticks Amblyomma hebraeum and Amblyomma variegatum (Ixodidae) in Zimbabwe (1974-1999)’, Veterinary Parasitology, vol. 151, no. 2-4, pp. 256-267. [] en_US
dc.identifier.issn 0378-1135
dc.identifier.other 10.1016/j.vetpar.2007.11.014
dc.identifier.other 7102989086
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.requires Adobe Acrobat Reader en
dc.rights Elsevier en_US
dc.subject Amblyomma hebraeum en_US
dc.subject Amblyomma variegatum en_US
dc.subject Zimbabwe en_US
dc.subject Climate cycles en_US
dc.subject Habitat suitability en_US
dc.subject Invasive events en_US
dc.subject.lcsh Veterinary parasitology en
dc.subject.lcsh Ticks -- Zimbabwe en
dc.subject.lcsh Ixodidae en
dc.title Climate changes and suitability for the ticks Amblyomma hebraeum and Amblyomma variegatum (Ixodidae) in Zimbabwe (1974–1999) en_US
dc.type Postprint Article en_US

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