Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Larval competition and genetic diversity in Tribolium castaneum | Genet Sei Evol 1993 25 31-40 Elsevier INRA 31 Original article Larval competition and genetic diversity in Tribolium castaneum c García1 MA Toro2 1 Facultad de Biologia Area de Genética Departamento de Biologia Fundamental Santiago de Compostela Galicia 2 CIT-INIA Departamento de Production Animal Carretera de la Coruna Madrid Spain Received 9 March 1992 accepted 24 November 1992 Summary - The study of the relationship between genetic homogenity and intensity of competition in groups of organisms may help to explain the widespread existence of sexual reproduction and it can also be used to design efficient crop mixtures. To study this we compared the survival of sib groups and random groups of larvae of the beetle Tribolium castaneum maintained at high population density every group was formed by introducing 150 eggs in 1 g of culture medium. The larvae in every group were counted weekly. The random groups survived longer as they had more larvae in the last weeks. This advantage was related to a higher early mortality which reduced competition in the long run in these groups. Therefore in the early stages of development our results did not confirm the hypothesis that genetically heterogeneous groups reduce competition through diversification in the use of environmental resources. In addition a clear increase in between-group variability for survival was found in the sib groups implying the presence of genetic variance for competitive ability at constant initial densities in this species. genetic homogeneity elbow-room model genetic variance for competition Tríbolium castaneum Resume Competition larvaire et diversité génétique chez Tri boll um castaneum. L étude de la relation entre rhomogénéité génétique et 1 intensité de la competition au sein de groupes d organismes peut servir à expliquer la predominance de la reproduction sexuée dans la nature et elle pourrait aussi être utỉlisée pour mettre au point des melanges de cultures. Dans ce but on a compare la .
