國立臺灣大學昆蟲學系暨研究所張慧羽2006-07-252018-06-292006-07-252018-06-292003http://ntur.lib.ntu.edu.tw//handle/246246/12586在實驗室中雜交時紅果蠅 (Drosophila albomicans) 與輝顏果蠅 (D. nasuta) 有交 尾後生殖隔離 (postmating isolating mechanism) 但不明顯。自然族群中紅果 蠅與輝顏果蠅地理分布雖然很接近但尚 未發現雜交個體，再加上這兩種果蠅的 染色體核型 (karyotype) 截然不同 (紅果蠅 為 2n=6 而輝顏果蠅為 2n=8)。在自然界 中隔絕兩者基因交流之因素的探究，是 研究族群分化 (population differentiation) 乃至於物種形成 (speciation) 的良好題 材。 實驗的設計是用來觀察紅果蠅與輝顏 果蠅交尾前生殖隔離 (premating)。實驗 中採用印度的輝顏果蠅與六個不同地理 區的紅果蠅進行交尾選擇實驗。因為在 種化之初生殖隔離尚不完備，紅果蠅與 輝顏果蠅不同地理族群間是否已產生了 不同型式的生殖隔離是本實驗的研究重 點。 實驗結果顯示泰國與沖繩的紅果蠅產 生了初步的交尾前生殖隔離，其他地區 (廣東、台灣、日本本州) 紅果蠅的交尾 前生殖隔離則不明顯。Drosophila albomicans and D. nasuta show a little but not significant postmating isolation. However, no hybrids have ever been found in nature anywhere including the area near the border, and they have different karyotypes (2n=6 in D. albomicans and 2n=8 in D. nasuta). Therefore it’s interesting to know what factors prevent gene flow between them. They are good material to realize population differentiation as well as speciation. The experiments were designed to investigate the premating isolation between D. albomicans and D. nasuta. The materials used in the experiments include one D. nasuta and six D. albomicans stocks from different geographic regions. Due to the incomplete reproductive isolation revealed by former experiments, we focused on whether the D. albomicans and D. nasuta have acquired premating isolation mechanisms. The result of our investigation revealed that there exists primary premating isolation between Thailand D. albomicans and India D. nasuta, but the premating isolation between India D. nasuta and D. albomicans from other regions (Kang Tong, Taiwan, Honshu Japan) is not significant.application/pdf132532 bytesapplication/pdfzh-TW國立臺灣大學昆蟲學系暨研究所物種形成紅果蠅輝顏果蠅生殖隔離speciationDrosophila albomicansD. nasutareproductive isolationreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12586/1/912313B002335.pdf