The relationship between climate and the distribution of Culicoides imicola in Iberia
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The biting midge Culicoides imicola was captured at 17 of 27 farms in Spain and Portugal during a survey of its distribution following outbreaks of African horse sickness in Iberia that occurred between 1987 and 1990. Farms were sampled approximately twice weekly from October 1992 to February 1995. Farms were widely spaced apart (maximum 850 km) and had considerable variation in climate. Across sites, summer temperatures ranged from 18.3°C–27.2°C; in winter the range was 4.4°C–11.6°C. Relative humidities in summer ranged from 37.2% to 90.1%. Proximity to southern Spain (Seville) was the most significant predictor of the presence/absence of C. imicola, but high summer temperatures and possibly dry summer conditions, were also important. Vila Nova de Milfontes in Portugal, where C. imicola was abundant and the climate is relatively cool, was an exception to the climatic trends at the other 26 sites. This exception points to a lack of knowledge of climatic requirements for immature development of C. imicola The absence of C. imicola from the three most easterly sites, which have apparently favourable climates, suggests a relatively recent invasion by this species into Iberia.
KeywordsMediterranean Basin Automatic Weather Station High Summer Temperature Bluetongue Virus African Horse Sickness Virus
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- 1.Boorman J, Wilkinson PJ (1983) Potential vectors of bluetongue in Lesbos, Greece. Vet Rec 113: 395–396Google Scholar
- 3.Houérou HN (1992) Vegetation and land-use in the Mediterranean Basin by the year 2050: A prospective study. In: Jeftic L, Milliman JD, Sestini G (eds) Climatic change and the Mediterranean. Edward Arnold, London, pp 173–232Google Scholar
- 4.Lubroth J (1988) African horse sickness and the epizootic in Spain 1987. Equine Prac 10: 26–33Google Scholar
- 5.MOPT (1992) Atlas Nacional de Espana. Secciôn II. Climatologia. Ministerio de Obras Pûblicas y Transportes, Direcciôn General del Instituto Geogrâfico Nacional, Madrid, Espana, p 29Google Scholar
- 7.Mellor PS, Boorman JPT, Wilkinson PJ, Martinez-Gomez F (1983) Potential vectors of bluetongue and African horse sickness viruses in Spain. Vet Rec 112: 229–230Google Scholar
- 9.Ortega MD (1995) Distribution and seasonal fluctuations of Culicoides spp. in Occidental Andalucia, Spain. MSc thesis, University of WyomingGoogle Scholar
- 11.Rodriguez M, Castano M, Escolar E, Flores JM, Toni P, Gonzalez M, Jimenez F, Gonzalez JL, Montoya A (1987) Peste equina africana: descripciôn del brote en Espana, 1987. Med Vet 4: 537–557Google Scholar
- 13.Wigley TML (1992) Future climate of the Mediterranean Basin with particular emphasis on changes in precipitation. In: Jeftic L, Milliman JD, Sestini G (eds) Climatic change and the Mediterranean. Edward Arnold, London, pp 15–44Google Scholar