Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài:Phenotypic plasticity of body pigmentation in Drosophila: Breeding structure of Drosophila buzzatii in relation to competition in prickly pears (Opuntia ficus-indica). | Genet Sei Evol 1997 29 367-382 Elsevier Inra 367 Original article Breeding structure of Drosophila buzzatii in relation to competition in prickly pears Opuntìa Ẽcus-indicà JE Quezada-Diaz H Laayouni A Leibowitz M Santos A Fontdevila Departament de Genética i de Microbiologia Universitat Autònoma de Barcelona 08193 Bellaterra Barcelona Spain Received 15 October 1996 accepted 22 April 1997 Summary - Rotting Opuntia ficus-indica fruits prickly pears are used as breeding sites for up to four Drosophila species D melanogaster D simulans D buzzatii and D hydei in southern Spain. A field experiment showed that the larvae of D buzzatii are resource limited in Opuntia fruits available for oviposition for 108 h. Experimental fruits infested with D larvae were divided into two halves the larvae in one half were allowed to develop normally while those in the other half were provided with extra food. Approximately five times as many D buzzatii emerged from the supplemented as from the control halves and the flies emerging from the supplemented halves were on average larger than those emerging from the control halves. F-statistics were estimated from allozyme data for the D buzzatii flies. The values obtained from the supplemented halves coupled with computer simulations to compare these estimates with the expected values generated by a limited number of mating pairs contributing progeny to a fruit suggest an effective size of about 30 individuals. Even though 95 bootstrap confidence intervals for Fis estimates comparing the supplemented and control halves do not overlap computer simulations suggest that we cannot support the hypothesis that selection is acting on allozyme variation. body size cactophilic Drosophila I competition density-dependent mortality population structure Resume structure génétique des populations de Drosophila buzzatii en situation de competition dans les Agues de barbarie Opuntia Scus-indica . Les fruits pourris d Opuntia ficus-indica figues de Barbaric
