When two types ofDrosophila are in competition, the frequency dependence of mating successes frequently is measured by direct observation of copulating pairs in Elens-Wattiaux observation chambers, the relative frequency of both types being varied. The present experiments, concerningwhite-ebony mutants in competition with wild-type Canton-S flies, show that the presence of food in the mating chamber influences the sexual activity of flies, this influence differing in the two types when food is present. Thus, in order to have a realistic estimation of frequency dependence, it would seem prudent to conduct these experiments with food in the chamber. Three methods are used to analyze observation data:K coefficients of Petit and Ehrman, regression equations of Ayala and Campbell, and regression equations of Wattiaux and Lichtenberger. These three methods are compared and discussed.
Key Words Drosophila melanogaster - rate-type mating advantage - food
This paper is dedicated to the memory of Marcel Lichtenberger, M.D., 15 years medical missionary in China and 17 years Professor of Human Genetics at the State University of Saigon, Vietnam.
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