Culicidae (Diptera) selection of humans, chickens and rabbits in three different environments in the province of Chaco, Argentina

ABSTRACT

Studies were conducted to determine the selection of humans, chickens and rabbits by Culicidae in three different environments in the province of Chaco, Argentina. Mosquitoes were collected fortnightly using cylindrical metal traps containing animal bait (chickens and rabbits). The mosquitoes were collected between June 2001-May 2002. During the same period and with the same frequency, mosquitoes biting the human operators of the traps were collected during the first 15 min of exposure within different time intervals from 0900 am-1100 am, 0100 pm-0300 pm, 0500 pm-0700 pm and 0900 pm-1000 pm. A total of 19,430 mosquitoes of 49 species belonging to 10 genera were collected. Culex species mainly selected chicken bait and Wyeomyia species selected rabbit bait. Ochlerotatus and Psorophora species were more abundant in rabbit-baited traps. Anopheles triannulatus, Coquillettidia nigricans, Ochlerotatus scapularis, Mansonia titillans and Psorophora albigenu showed a strong attraction for human bait. The Anopheles, Coquillettidia, Culex and Mansonia species were more active between 0500 pm-0900 pm, while Ochlerotatus, Psorophora, Haemagogus and Wyeomyia were most active from 0900 am-0700 pm. This study provides additional information about the biology and ecology of arbovirus vectors in Chaco.