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題名 | Phylogeny of Calocedrus (Cupressaceae), an Eastern Asian and Western North American Disjunct Gymnosperm Genus, Inferred from Nuclear Ribosomal nrITS Sequences=根據核醣體基因間片段重建分佈於亞洲東部及北美西部肖楠屬的親緣關係 |
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作者 | 陳志輝; 黃仁磐; 蔡奇助; 趙淑妙; | 書刊名 | Botanical Studies |
卷期 | 50:4 2009.10[民98.10] |
頁次 | 頁425-433 |
分類號 | 436.1111 |
關鍵詞 | 肖楠; 不連續分佈; 化石紀錄; 親緣地理; 地理事件; nrITS; Calocedrus; Disjunct distribution; Fossil records; Geohistorical events; Phylogeography; |
語文 | 英文(English) |
中文摘要 | 我們分析21 個來自越南、雲南、台灣及加州的肖楠個體之核醣體基因間片段,探討分布在台灣及亞洲大陸個體之間的關係,並推論導致本屬植物目前分佈型式的原因。我們的分析結果都顯示產於亞洲與美洲的肖楠彼此之間分化相當明顯。除此之外估算出來的物種分化時間皆與化石出現時間或地理事件發生時間一致。台灣肖楠與亞洲大陸產之翠柏之間除了外觀上明顯的形態差異之外,兩者間分子層面的差異亦超出另一個屬(紅豆杉屬)所估算出的物種間差異,故台灣肖楠應被視為一個新形成的獨立物種。而歷史上的不連續分佈的地理事件為造成本研究所選取的三個物種異域種化的機制。 |
英文摘要 | To resolve relationships between Taiwanese and other Asian species of Calocedrus and to infer the causes of the contemporary distribution of the genus, we analyzed 21 individuals sampled from Vietnam, Yunnan (China), Taiwan, and California (USA). Phylogenetic and phylogeographic analyses based on the nrITS sequence data suggested a deep split between Asian and American Calocedrus. In addition, our estimated dates of species divergence are consistent with fossil records and geohistorical evidence. Because, in addition to the distinctive morphology between C. formosana and C. macrolepis, the sequence divergence between them exceeds the interspecific level of divergence between species of Taxus, C. formosana could be regarded as a newly emerged distinct species. Speciation of the three species of Calocedrus studied was evidently shaped by geohistorical vicariant events, mainly allopatric fragmentations. |
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