Taxonomic Problems in the Drosophila melanica Species Group (Diptera: Drosophilidae) from Southern China, with Special Reference to Karyotypes and Reproductive Isolation(Taxonomy)

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概要

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• Karyotypes and reproductive isolation were studied in two allopatric populations of Drosophila tsigana, one from Guizhou Province in southern China and the other from Hokkaido in northern Japan, and in one population of a closely related species, D. longiserrata, from Guizhou. In metaphase plates of larval brain cells, both geographic strains of Drosophila tsigana showed 2n=10 chromosomes, with 2 pairs of metacentric (V-shape), 2 pairs of acrocentric (R-shape), and 1 pair of dot-liked (D-shape) chromosomes. Drosophila longiserrata showed the same number, 10 chromosomes, comprising 2V, 1J (sub-metacentric chromosome), 1R, and 1D. X chromosomes of both species were acrocentric, the presumed ancestral form. Premating isolation was complete between D. tsigana and D. longiserrata, and successful mating was also limited in crosses between the two geographic populations of D. tsigana, especially in crosses between Japanese (JP) females and Guizhou (GZ) males. F_1 hybrids were obtained only from crosses between GZ females and JP males, and fertilities of both F_1 females and males were quite incomplete. The results of morphological observations, karyotypic analyses, and crossing experiments clearly showed that the GZ and JP populations of "D. tsigana" were highly divergent from each other and that each population should be recognized as a biologically valid species. The present morphological observations and chromosomal analyses, together with the original descriptions, strongly suggest that "Guizhou D. tsigana" might be conspecific with D. bisetata Toda, 1988 from Myanmar, and that D. longiserrata might be conspecific with D. afer Tan, Hsu, and Sheng, 1949 from Meitan, Guizhou.

• 社団法人日本動物学会の論文
• 2006-10-25

著者

• 渡部 英昭

  北海道教育大学札幌校生物学教室

• Watabe Hide-aki

  Biological Laboratory, Hokkaido University of Education

• Zhang Ya-ping

  Laboratory Of Molecular Evolution And Genome Diversity Kunming Institute Of Zoology The Chinese Acad

• Wang Bao-cheng

  Laboratory of Cellular and Molecular Evolution, Kunming Institute of Zoology, Chinese Academy of Sci

• Ohtani Kanako

  Biological Laboratory, Sapporo College, Hokkaido University of Education

• Gao Jian-jun

  Laboratory for Conservation and Utilization of Bio-resources, Yunnan University

• Watabe Hide-aki

  Biological Laboratory Sapporo College Hokkaido University Of Education

• Gao Jian-jun

  Laboratory For Conservation And Utilization Of Bio-resources Yunnan University

• Ohtani Kanako

  Biological Laboratory Sapporo College Hokkaido University Of Education

• Wang Bao-cheng

  Laboratory Of Cellular And Molecular Evolution Kunming Institute Of Zoology Chinese Academy Of Scien

• Zhang Ya-ping

  Laboratory For Conservation And Utilization Of Bio-resource Yunnan University

• Gao Jian-jun

  Laboratory For Conservation And Utilization Of Bio-resource Yunnan University

• Zhang Ya-ping

  Laboratory Of Molecular Evolution And Genome Diversity Kunming Institute Of Zoology Chinese Academy

• 渡部 英昭

  北海道教育大学札幌校

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