Phylogeny of Calocedrus (Cupressaceae), an Eastern Asian and Western North American disjunct gymnosperm genus, inferred from nuclear ribosomal nrITS Sequences
Botanical Studies (2009) 50: 425-433.
ABSTRACT. 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.
前鎮子有參與的研究...終於出來了!!
大開心....
講的是台灣肖楠的系統分類地位,
還有第三季到第四季地質事件對目前肖楠屬在世界分布的影響.
Bayesian estimations of divergence times for three species of Calocedrus using known fossil records for calibration. Numbers before nodes denote estimated divergence times; gray bars represent 95% CIs. Diagram below time scale denotes corresponding geological period; shaded boxes and scaled horizontal lines represent locations and geological time for fossils of Calocedrus. Circles show current distribution of Calocedrus.
Botanical Studies (2009) 50: 425-433.
ABSTRACT. 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.
前鎮子有參與的研究...終於出來了!!
大開心....
講的是台灣肖楠的系統分類地位,
還有第三季到第四季地質事件對目前肖楠屬在世界分布的影響.
Bayesian estimations of divergence times for three species of Calocedrus using known fossil records for calibration. Numbers before nodes denote estimated divergence times; gray bars represent 95% CIs. Diagram below time scale denotes corresponding geological period; shaded boxes and scaled horizontal lines represent locations and geological time for fossils of Calocedrus. Circles show current distribution of Calocedrus.
