鳥(niǎo)類具有較強(qiáng)的遷移能力,，能夠?qū)夂蜃冞w和地質(zhì)變化做出快速反應(yīng),。楊曉君課題組應(yīng)用多基因數(shù)據(jù)的研究結(jié)果顯示，傳統(tǒng)分類觀點(diǎn)認(rèn)定的斑翅鹛屬(Actinodura)和鉤嘴鹛屬(Pomatorhinus)均為并系群,，提示東亞鳥(niǎo)類進(jìn)化歷史復(fù)雜,，可能經(jīng)歷了適應(yīng)環(huán)境的趨異進(jìn)化,。結(jié)合形態(tài)資料，兩個(gè)屬的分類地位得到了修正,，分別被拆分為形態(tài)差異顯著的兩個(gè)屬,。斑翅鹛屬內(nèi)部存在南北分化，并向東西擴(kuò)張格局,，生態(tài)資料提示這一格局可能是同域生態(tài)位分化后發(fā)生地理替代的結(jié)果,。鉤嘴鹛及其近緣類群的進(jìn)化過(guò)程中，喙的變異呈現(xiàn)不連續(xù)性,，該類群的祖先起源于中新世氣候適宜期,，隨后的物種分化均與一系列氣候事件相對(duì)應(yīng)，這種格局很可能是適應(yīng)性進(jìn)化的結(jié)果,。上述研究提示由于東亞復(fù)雜的地形和地質(zhì)歷史,，鳥(niǎo)類區(qū)系的演化歷史也相對(duì)復(fù)雜。（生物谷Bioon.com）
生物谷推薦原文出處：
Molecular Phylogenetics and Evolution doi:10.1016/j.ympev.2010.09.023
Molecular systematics and diversification of the Asian scimitar babblers (Timaliidae, Aves) based on mitochondrial and nuclear DNA sequences
Feng Donga, Shou-Hsien Lib, , and Xiao-jun Yanga, ,
a State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China
b Department of Life Science, National Taiwan Normal University, Taipei 116, Taiwan
Abstract
The Asian scimitar babblers, including the genus Pomatorhinus and Xiphirhynchus, are a small group of babblers characterized by long down-curved bills and a distribution throughout East and Southeast Asia. To infer the molecular phylogeny of this group and their divergence time, we examined sequences of multiple fragments including two entire mitochondrial genes and four nuclear introns (4352 bp in total) from multiple samples of eight of the nine recognized species of Asian scimitar babblers. The phylogeny resulting from the concatenated multi-locus dataset suggests that Pomatorhinus is paraphyletic. Due to its paraphyly, we propose dividing the traditional genus Pomatorhinus into two morphologically and genetically diagnosable genera: Pomatorhinus and Erythrogenys. Results of the molecular dating based on the conventional mitochondrial DNA divergence rate indicates that the diversification of these babblers is likely congruent with the historical climatic events. Our findings shed light on the diversification of avian species in southern Asia, a poorly studied biodiversity hotspot.
原文鏈接
Molecular Phylogeny of the Barwings (Aves: Timaliidae: Actinodura), a Paraphyletic Group, and Its Taxonomic Implications
