Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 21, Nov. Suppl. Issue, 2019; Page No.(1-5)

USING LANDMARK-BASED GEOMETRIC MORPHOMETRIC TODISCRIMINATE MALE CULEX QUINQUEFASCIATUS AND CX.SITIENS IN COASTAL AREAS OF SAMUT SONGKHRAMPROVINCE, THAILAND

TANAWAT CHAIPHONGPACHARA

Abstract

Mosquitoes are small insects and major vectors of human diseases. At present, the idea of female mosquitoes as vectors has been uncovered, quite different from male mosquitoes. The reason may be that they are not vectors as well as there being problems in identifying them, which is more difficult than in female mosquitoes. In this study, we evaluated the effectiveness of landmark-based geometric morphometric method to distinguish two male species of Culex mosquitoes, including Culexquinquefasciatus and Cx. sitiens,in the coastal areas of Samut Songkhram Province, Thailand. The wing size analyses of male Cx.quinquefasciatus and Cx.sitiens showed a significant difference in terms of centroid size among species (p<0.01). Cx.quinquefasciatus males had a mean value of 1.98 mm whereas Cx. sitiens males showed a mean value of 2.12 mm. Meanwhile, wing shape along with pairwise comparison of Mahalanobis distances between male Cx. quinquefasciatus and Cx. sitiens showed differentiation among species based on 1,000 cycles of nonparametricpermutation testing (p< 0.01). These results clearly reveal the great potential of landmark-basedmethod for the identification of both species of male Culex mosquitoes. This information will serve asguidelines for discriminating male mosquitoes in other areas further.

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