TAILIEUCHUNG - Báo cáo sinh học: "Seasonal fluctuations of cosmopolitan inversion frequencies in a natural population of Drosophila melanogaster"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Seasonal fluctuations of cosmopolitan inversion frequencies in a natural population of Drosophila melanogaster | Genet Sei Evol 1990 22 47-56 Elsevier INRA 47 Original article Seasonal fluctuations of cosmopolitan inversion frequencies in a natural population of Drosophila melanogaster F Sanchez-Refusta E Santiago J Rubio ưniversidad de Oviedo Departamento de Biologia Funcional Genética 3307Í Oviedo Spain Received 10 June 1988 accepted 30 October 1989 Summary - Seasonal changes in the frequencies of cosmopolitan inversions and In 3R C have been investigated in a Spanish population of Drosophila melanogaster for 4 years. Regression and Fourier analysis methods were used to separate the temporal variation of the frequencies into linear and cyclic components. Different patterns in temporal variation were detected. The frequency of In 2R NS was stable In 3R C tended to increase its frequency across the years In 3R P showed oscillations that could not be attributed to cyclic changes. In 2L t and In 3L P showed seasonal cyclic changes with increasing frequencies during the warm months which are thought to be mainly due to the superior relative fitness of heterozygotes as compared with inversion non-carrier individuals. The fall of frequencies in the cold months is probably a consequence of the shorter lifespan of the carriers of these inversions during the winter. The differences between the temporal variation patterns of the inversions do not support the hypothesis of a single climatic factor as being responsible for the geographic cline of the cosmopolitan inversions. Without ignoring the influence of underlying selective factors of macroclimatic nature other ecological and genetical factors uncorrelated with latitude are suggested to play á role in the temporal dynamics of the inversions as well as in their geographic distribution. Drosophila melanogaster I inversion frequency seasonal change Resume Fluctuations saisonnières des frequences d inversions cosmopolites dans une population naturelle de Drosophila melanogaster - Les variations saisonnières des frequences de plusieurs

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