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The effects of different blood-meal sources on digestion and egg production in Culex tarsalis Coq. (Diptera: Culicidae).

Rate of digestion in Culex tarsalis Coquillett that had fed on guinea pigs, chickens or snakes was determined by serological precipitin tests and benzidine tests. Blood meals from guinea pig were digested more slowly than those from chickens and snakes. Serum proteins were detected for a similar length of time after feeding (and in similar proportions of samples) in mosquitoes which had fed on either chickens or snakes. The number of eggs per raft and the hatchability of eggs in each raft were also recorded after mosquitoes had fed on one of the 3 types of host. Egg production was significantly higher in mosquitoes that fed on chickens as compared to those that fed on snakes. Mosquitoes which fed on guinea pigs produced the fewest eggs. The source of the blood meal did not influence the hatchability of the eggs. In addition to live hosts, mosquitoes were also induced to feed through membranes on the following blood preparations: citrated snake blood, citrated guinea pig blood, snake erythrocytes in guinea pig serum, guinea pig erythrocytes in snake serum. Mosquitoes that fed on blood preparations containing snake erythrocytes produced significantly more eggs than those that fed on preparations containing guinea pig erythrocytes. Results are discussed in relation to the physiology of digestion and egg production. Speculations on some adaptations of mosquitoes to their hosts are presented.