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báo cáo khoa học: " Intra- and intergenotypic larval competition Drosophila melanogaster : effect of larval density and biotic residues"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Intra- and intergenotypic larval competition Drosophila melanogaster : effect of larval density and biotic residues | Génét. Sél. Evol. 1987 19 4 427-444 Intra- and intergenotypic larval competition in Drosophila melanogaster effect of larval density and biotic residues J.A. CASTRO Luisa M. BOTELLA and J.L. MENSUA Departamento de Genética Facultad de Biologta Umversidad de Valencia Dr. Moliner 50 46100 Burjassot Valencia Spain Summary Optimal density maximum adult production was determined in 8 strains of Drosophila melanogaster reared on small amounts of food. The amount of uric acid excreted by each strain into the medium was also determined as well as the resistance to toxic products urea and uric acid added to the media. Competitive dicultures between these strains were later established so that the total seeding density corresponded to optimal densities of each competitor. In these competitive systems regressions higher than first order were found. The outcome for viability and developmental time in dicultures is explained in terms of the parameters studied in the monocultures viability developmental time intrinsic mortality optimal density excretion of uric acid and resistance to biotic wastes. Key words Drosophila melanogaster viability developmental time competition biotic residues. Resume Competition larvaire intra- et intergénotypique chez Drosophila melanogaster effet de la densité larvaire et des résidus biologiques La densité optimale definie comme la production maximale d adultes ạ ệté déterminée pour 8 genotypes de Drosophila melanogaster cultivés sur des petites quantités d aliment. La quantite d acide urique excrétéê dans le milieu de culture par chaque genotype a été déterminée ainsi que leur resistance aux produits toxiques urée et acide urique additionnés à 1 aliment. La competition entre ces genotypes a été étudiée dans des cultures mixtes de telle sorte que la densité larvaire corresponde à la densité optimale de chaque cọmpétiteur. Dans ces cultures mixtes la viabilité larvo-nymphale et la duree de développement de chaque genotype varient en fonction de sa .