Abstract

MORA-COVARRUBIAS, A de la; RUBIO-ARIAS, HO  and  JIMENEZ-CASTRO, JA. Entomological surveillance of Culex quinquefasciatus Say, 1823, an arboviral disease vector in the urban area of Ciudad Juarez, Chihuahua, Mexico. Universidad y ciencia [online]. 2008, vol.24, n.2, pp.101-109. ISSN 0186-2979.

The purpose of this study was to validate a geospatial distribution model generated in 2005 for the southern house mosquito Culex quinquefasciatus. Weekly entomological samples were collected in the urban area of Ciudad Juarez, Chihuahua, Mexico. Samples were obtained from June 27^th to September 26^th 2006 at 14 permanent sites located within a radius of 2 000 m. Center of Disease Control (CDC) type light minitraps with dry ice as bait were used. Results were evaluated with Moran and Geary's spatial autocorrelation index, dispersion maps (Kriging technique) and variance analyses (ANOVA). The paired t-test was used to check for statistical differences between the results obtained for 419 sampling sites in 2005 and 14 sampling sites in 2006. A total of 6 080 female mosquitoes of the species C. quinquefasciatus were collected in 2006. The lack of spatial autocorrelation proved independence between sites. The probabilistic dispersion maps showed a temporal consistency for the four weeks that were evaluated. The abundance of mosquitoes in sites two, seven and nine was greater (ANOVA; ρ = 0.002) than that in the other 11 sites. The mean mosquito density did not show differences (t = -0.63; p = 0.543) for the two years, confirming the value of the geospatial model of 2005, validated with the temporal model of 2006. The results will make it possible to establish an efficient and low cost surveillance of the mosquito C. quinquefasciatus, for the benefit of Ciudad Juarez, México and El Paso, USA.

Keywords : Geospatial model; dispersion pattern; autocorrelation.

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