Inter-generic bio-variability and relative abundance of adult female biting mosquitoes in wet and dry land areas of selected villages in a semiarid zone

The present study gives valuable information on the biodiversity and their relative abundance of biting female mosquitoes occurring in four villages (Senkulam, Attikulam, Chittalamputtur and Kadampankulam) of Srivilliputtur town and five regions (Central region, Northern region, Western region, Southern region and Eastern region) of Keelaarunachalapuram village nearly located to town of Tuticorin, Tamil Nadu between September 2007 and February 2008. This both study area has contained various types of human settlements and with varying number of cattles and other animals. A total of 4059 mosquitoes of 15 species belongs to 4 genera were collected in all regions and villages of both study area. The study period was divided into two periods such as early (September, October, November) and late cultivation (December, January, February) period. A total of 2070 mosquitoes were collected in early cultivation period and 1989 mosquitoes were collected in late cultivation period. Culex species was highly noticed followed by Aedes, Anopheles and Armigeres respectively in both cultivation periods of all regions of Keelaarunachalapuram village and also Culex species was highly noticed followed by Anopheles, Armigeres and Aedes respectively in both cultivation periods of all villages of Srivilliputtur town. Significant differences were noticed in the diversity and their relative abundance on both cultivation periods of two (Srivilliputtur and Keelaarunachalapuram) study area. This both study area contains more breeding habitats like ponds, irrigation canal, sewage water bodies, drains, unused grinding stones, coconut shell and broken bottles including discarded containers were responsible for the emerging species and their abundance of the mosquitoes. We suggest from our [mdings that properly maintained drainage and removal of unusable things of study areal rural areas help to prevent the outbreak.