title: Feeding patterns of potential West Nile virus vectors in south-west Spain.
abstract: BACKGROUND
  Mosquito feeding behaviour determines the degree of vector-host contact and may have a serious impact on the risk of West Nile virus (WNV) epidemics. Feeding behaviour also interacts with other biotic and abiotic factors that affect virus amplification and transmission.
  
  
  RESULTS
  We identified the origin of blood meals in five mosquito species from three different wetlands in SW Spain. All mosquito species analysed fed with different frequencies on birds, mammals and reptiles. Both 'mosquito species' and 'locality' explained a similar amount of variance in the occurrence of avian blood meals. However, 'season of year' was the main factor explaining the presence of human blood meals. The differences in diet resulted in a marked spatial heterogeneity in the estimated WNV transmission risk. Culex perexiguus, Cx. modestus and Cx. pipiens were the main mosquito species involved in WNV enzootic circulation since they feed mainly on birds, were abundant in a number of localities and had high vector competence. Cx. perexiguus may also be important for WNV transmission to horses, as are Cx. pipiens and Cx. theileri in transmission to humans. Estimates of the WNV transmission risk based on mosquito diet, abundance and vector competence matched the results of previous WNV monitoring programs in the area. Our sensitivity analyses suggested that mosquito diet, followed by mosquito abundance and vector competence, are all relevant factors in understanding virus amplification and transmission risk in the studied wild ecosystems. At some of the studied localities, the risk of enzootic circulation of WNV was relatively high, even if the risk of transmission to humans and horses was less.
  
  
  CONCLUSIONS
  Our results describe for first time the role of five WNV candidate vectors in SW Spain. Interspecific and local differences in mosquito diet composition has an important effect on the potential transmission risk of WNV to birds, horses and humans.
authors: Estación Biológica de Doñana (CSIC), Seville, Spain.
authors: Joaquín
authors: J
authors: Muñoz
authors: Santiago
authors: S
authors: Ruiz
authors: Ramón
authors: R
authors: Soriguer
authors: Miguel
authors: M
authors: Alcaide
authors: Duarte S
authors: DS
authors: Viana
authors: David
authors: D
authors: Roiz
authors: Ana
authors: A
authors: Vázquez
authors: Jordi
authors: J
authors: Figuerola
mesh_terms: D000818:Animals; D003465:Culex / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology*; D007303:Insect Vectors / Q000502:physiology*; D013030:Spain; D014901:West Nile Fever / Q000635:transmission* / Q000821:virology; D014902:West Nile virus / Q000472:pathogenicity