Prediction of Anopheles minimus habitat in India - a tool for malaria management

This paper reports research to predict the distribution of An, minimus. a malaria vector in forest fringe areas using GIS to support precision surveys for malaria control. Because An. minimus is a forest-associated species. generalized thematic maps (1:6000000) of forest cover, soil type, altitude, rainfall and temperature were used. Digitization, overlaying, integration and analysis of thematic maps were done using Arc/Info 8.1 NT and Arc/View 3.2 (GIS, ESRI) software. GIS delineated favourable areas for An. minimus where the species is likely to be found, and precision surveys can be conducted. Precision field surveys in selected locations of favourable/non-favourable areas were carried out. The species could be found in all locations designated as a favourable area and was absent in nonfavourable areas. In two districts, one where the species is reported to have disappeared in the early 1950s and the other where it was not reported in earlier surveys, GIS helped in precision surveys, and An. minimus was found. The technique can quickly cover vast and inaccessible areas and is easy to duplicate in other parts of the world to assist cost-effective control of malaria. It can also delineate areas favourable for any species of flora and fauna to help precision surveys.