Influence of larval and adult nutrition on biting persistence in Aedes aegypti (Diptera: Culicidae).

Biting persistence was measured for Aedes aegypti (L.) mosquitoes given different levels of larval and adult nutrition. Persistence was measured as the total number of times during a 60-min trial that a mosquito returned to land on a defensive host after being disturbed and dislocated from the host, and as the rate of decline of landings over the 60 min test (pattern of persistence). Large females were significantly more persistent than smaller females, regardless of whether the females were provided water or 5% sucrose for 3 d before the test. Access to sucrose for 3 or 7 d did not influence the total number of landings of large females. Large females starved for 7 d exhibited significantly reduced persistence compared with large females starved for only 3 d. Water-fed specimens displayed a more rapid decline in the pattern of persistence than sucrose-fed specimens. Field-collected females, intermediate in size between the large and small laboratory females, had dry weights indicating they were relatively starved. They had a total number of landings similar to the small laboratory females and a persistence pattern similar to sucrose-fed specimens. Size-related differences in persistence may be one factor causing differences in parity rates and vector potential observed between large and small females in Ae. aegypti field populations.