Biology of Sergentomyia Ingrami (Diptera: Psychodidae): Report on Autogeny and the Effects of Delayed Oviposition on Fecundity
McLaughlin, Nathan E.
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The prevalence of autogeny, the ability of haematophagus insects to lay viable eggs without first taking a blood meal, was investigated for the sand fly, Sergentomyia ingrami, collected from Marigat, Baringo District, Kenya. Individual sand flies were taken from a laboratory colony maintained at the International Centre of Insect Physiology and Ecology (ICIPE). Those sand flies that were fed only sugar did not produce any eggs, whatsoeve. This anautogeny could be due to a particularly low-protein larval diet, or it could reflect an absence of autogenous capability for this particular strain of S. ingrami. In the second group of trials, sand flies that were allowed to oviposit 7 da. after emergence produced an average of 123.6 eggs per female, while the control group which oviposited 5 da. post-emergence produced an average of 72.1 eggs per female. Because females that did not oviposit were not counted in these means, the increase in fecundity is not related to the increased opportunity for mating gained by this delay. This marked increase In fecundity is probably related to the advanced age of the females at oviposition, the consequent difference in sexual maturity, and the increase in the amount of time females are able to retain viable sperm for fertilization before oviposition.