Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Variable outcome in competition experiments between Drosophila melanogaster and Drosophila simulans | Génét. Sél. Evol. 1986 18 1 11-24 Variable outcome in competition experiments between Drosophila melanogaster and Drosophila simulans p. CASARES and María c. CARRACEDO Departamento de Genetica Facultad de Biologia Universidad de Oviedo 33006 Oviedo Spain Summary Individuals of wild phenotype of Drosophila melanogaster and D. simulans extracted from a single base population of each species were placed to compete in single monogenerational cultures. Four tests were carried out at different dates showing that the competitive result was different in each test with several interspecific interactions that included mutual facilitation as well as mutual inhibition. So the competitive interactions were not constant throughout the experiment. In the base populations adult and preadult fitness components underwent profound changes with time modifying in different ways the relative competitive ability of both species. The competitive outcome measured from laboratory populations was unpredictable. It is suggested that the observed changes in population fitness and competitive ability in the base populations of the 2 species might be related to the dynamic of seasonal population growth of these species which is discussed in relation to the distribution and relative abundance of these drosophilids in nature. Key words Interspecific competition Drosophila melanogaster Drosophila simulans timedependent fitness competitive interactions. Resume Résultat variable dans des experiences de compétition entre Drosophila melanogaster et Drosophila simulans Des individus de phenotype sauvage de Drosophila melanogaster et D. simulans extraits d une population de base de chaque espèce ont été utilises dans des experiences de competition sur une generation. On a réalisé 4 tests à des dates differentes obtenant chaque fois un résultat competitif different avec divers types d interactions interspecifiques qui incluent aussi bien une facilitation réciproque qu une inhibition réciproque. Ainsi done
