A cladistic scenario of Southern Pacific biogeographical history based on Nothofagus dispersal and vicariance analysis  

作　　者：MingLi ZHANG 

机构地区：[1]Key Laboratory of Biogeography and Bioresources in Arid Land,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [2]Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

出　　处：《Journal of Arid Land》2011年第2期104-113,共10页干旱区科学(英文版)

基　　金：supported by Important Direction for Knowledge Innovation Project,CAS (KZCX2-EW-305);Xinjiang Institute of Ecology and Geography,CAS

摘　　要：Nothofagus is regarded as a key group for interpreting Southern Pacific biogeographical history.Based on a molecular phylogenetic tree,a quantitative dispersal-vicariance analysis(DIVA) of the genus is presented.The results indicate that the ancestral area of Nothofagus is a broad realm almost including the total extant distribution pattern of the genus rather than a so-named center of origin.Integrated with the paleogeography,the time of origin and subsequent diversification is inferred to have started in the Late Cretaceous.Most vicariance and dispersal events should be contained in that period.Vicariance events versus dispersal events play a dominant rule in speciation.The dispersal events are hypothesized to happen from the Late Cretaceous to Eocene in terms of the geological history.Rich fossils are collected in the Eocene.South America,comprising three subgenera of Nothofagus,should be considered as a diversification region,in which the distribution of the species of subgenus Fuscospora and subgenus Nothofagus are explained by dispersal events during the Late Cretaceous-Late Eocene.Nothofagus is regarded as a key group for interpreting Southern Pacific biogeographical history.Based on a molecular phylogenetic tree,a quantitative dispersal-vicariance analysis(DIVA) of the genus is presented.The results indicate that the ancestral area of Nothofagus is a broad realm almost including the total extant distribution pattern of the genus rather than a so-named center of origin.Integrated with the paleogeography,the time of origin and subsequent diversification is inferred to have started in the Late Cretaceous.Most vicariance and dispersal events should be contained in that period.Vicariance events versus dispersal events play a dominant rule in speciation.The dispersal events are hypothesized to happen from the Late Cretaceous to Eocene in terms of the geological history.Rich fossils are collected in the Eocene.South America,comprising three subgenera of Nothofagus,should be considered as a diversification region,in which the distribution of the species of subgenus Fuscospora and subgenus Nothofagus are explained by dispersal events during the Late Cretaceous-Late Eocene.

关 键 词：NOTHOFAGUS Pacific biogeography distribution VICARIANCE dispersal 

分 类 号：Q948[生物学—植物学]