الفهرس 
Introduction
CoevolutionOnly 14 pages are availabe for public view
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Abstract
The aim of the present instigation was to thrigh sale light on
[the evolutionary relationship bet.een yeast and Drosophila. br this
jmrpose three experents iere carried out.Experhrent I: The effect of 12. metamogaster and 12. simutans larvae on the outcczie of çetition between mixed populations of yeast, establithed by equal v.eights, were studied. Yeast mixtures used ere as follows:
— Saccharomyoes cerevieiae (haploid wild—type) + S. cerevisiae (nutant strain).
S. cerevisiae (haplold wild—type) + CandiO.a putchertma (nutant strain)Ftr each species of Drosophila , 7 vials inoculated with one of the yeast mixtures 4lere cultured with 30 larvae and 7 others left without larvae as control, and ‘are kept at 25 C. After pupal formation the yeast content of the netha was assessed
In the interspecific etition between Sadcharomyces and Can dida the total antunt of yeast cells ir the nediwn increased significantly owing to the presen of larvae of either of flies species, with rio significant difference betQeen these latters. An uilibrium state was faind in bth controls at the initial genera frequencies until the end of the experinent. Larvae of each of 12rosophila species perturbated this balance in favor of C. putcherima.