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题名: Ancient divergence and biogeography of Raukaua (Araliaceae) and close relatives in the southern hemisphere
作者: Mitchell, Anthony1; null(李嵘)2; Brown, Joseph W.3; Schoenberger, Ines4; Wen, Jun5
刊名: AUSTRALIAN SYSTEMATIC BOTANY
关键词: LONG-DISTANCE DISPERSAL ; DNA-SEQUENCE DATA ; NEW-ZEALAND ; PHYLOGENETIC ANALYSIS ; GOODBYE GONDWANA ; TERRESTRIAL FAUNA ; FLOWERING PLANTS ; MIXED MODELS ; EVOLUTION ; GENUS
英文摘要: Molecular genetic analyses were used to reconstruct phylogenetic relationships and estimate divergence times for Raukaua species and their close relatives. A monophyletic group identified as the 'greater Raukaua clade' was circumscribed, with eight representative species; its basal divergence was estimated at c. 70 Mya, possibly after Zealandia had separated from Gondwana. Raukaua is paraphyletic because of the placement of Motherwellia, Cephalaralia, Cheirodendron and Schefflera s.s. The phylogeny supports a more narrowly circumscribed Raukaua that includes the New Zealand but not the South American or Tasmanian representatives. Ancestors of the monophyletic South American and Tasmanian Raukaua and the mainland Australian Motherwellia and Cephalaralia diverged at c. 66 Mya and their current disjunction may be vicariant, with overland dispersal between Australia and South America, possibly via Antarctica. Vicariance is also a likely mechanism for divergence at c. 57 Mya of the monophyletic Motherwellia, Cephalaralia and Tasmanian Raukaua. The common ancestor of New Zealand Raukaua, Cheirodendron and Schefflera s.s. is inferred to have existed c. 62 Mya in New Zealand, before the marine incursions during the Oligocene, implying that New Zealand Raukaua and Schefflera s.s. survived the inundation period or speciated outside New Zealand and subsequently colonised. Ancestors of Cheirodendron split from New Zealand Raukaua c. 43 Mya and dispersed over vast expanses of the south-western Pacific to Hawaii.
出版日期: 2012-12-14
卷号: 25, 期号:6, 页码:432-446
DOI标识: 10.1071/SB12020
语种: 英语
收录类别: SCI
学科分类: Plant Sciences; Evolutionary Biology
ISSN号: 1030-1887
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/16002
Appears in Collections:中国西南野生生物种质资源库_期刊论文

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作者单位: 1.Univ Otago, Christchurch 8140, New Zealand
2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Yunnan, Peoples R China
3.Univ Idaho, Dept Biol Sci, Moscow, ID 83843 USA
4.Landcare Res, Allan Herbarium CHR, Lincoln 7640, New Zealand
5.Smithsonian Inst, Dept Bot MRC, Washington, DC 20013 USA

Recommended Citation:
Anthony Mitchell, Rong Li, Joseph W. Brown, Ines Schoenberger, Jun Wen. 2012. Ancient divergence and biogeography of Raukaua (Araliaceae) and close relatives in the southern hemisphere. Australian Systematic Botany 25: 432-446.
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