東亞特有鯉科魚類是東亞淡水魚類重要組成部分,，在整個鯉科魚類的分布范圍內(nèi),，東亞地區(qū)鯉科魚類的物種多樣性有其獨(dú)特性和代表性,，其物種形成和分化研究對了解東亞地區(qū)淡水魚類分布格局的形成和演變具有重要的意義。已有研究表明,，東亞類群是鯉科魚類中的一個單系類群,，其物種分化與東亞季風(fēng)氣候進(jìn)化和形成關(guān)系密切。然而,，這一東亞特有鯉科類群內(nèi)的系統(tǒng)發(fā)育關(guān)系尚未明確,，其內(nèi)部分類單元間的系統(tǒng)發(fā)育關(guān)系研究尚待深入。
10月20日,，PLoS ONE雜志在線發(fā)表了中國科學(xué)院水生生物研究所系統(tǒng)發(fā)育與生物地理學(xué)學(xué)科組博士生陶文靜在何舜平研究員指導(dǎo)下完成的題為Phylogenomic Analysis Resolves the Formerly Intractable Adaptive Diversification of the Endemic Clade of East Asian Cyprinidae (Cypriniformes)的論文,。
最新研究使用系統(tǒng)發(fā)育基因組方法，對東亞特有鯉科魚類的系統(tǒng)發(fā)育關(guān)系進(jìn)行了重建,。該研究選擇了100個基因作為遺傳標(biāo)記,，構(gòu)建了鯉科東亞類群代表性物種間穩(wěn)固的系統(tǒng)發(fā)育關(guān)系。研究表明,，東亞類群的物種分化集中在760-190萬年前,，祖先狀態(tài)重建表明，東亞類群中魚類的趨同性狀是在生態(tài)系統(tǒng)中相似選擇壓力作用下獨(dú)立進(jìn)化而成的,。
本研究結(jié)果為更進(jìn)一步的鯉科魚類基因組進(jìn)化研究及其物種分化研究提供了重要的基礎(chǔ),。
該研究得到國家基礎(chǔ)研究973計劃、國家重點基金等項目的資助,。（生物谷Bioon.com）
生物谷推薦英文摘要：
PLoS ONE 5(10): e13508. doi:10.1371/journal.pone.0013508
Phylogenomic Analysis Resolves the Formerly Intractable Adaptive Diversification of the Endemic Clade of East Asian Cyprinidae (Cypriniformes)
Wenjing Tao1,2, Ming Zou1,2, Xuzhen Wang1,2, Xiaoni Gan1,2, Richard L. Mayden3, Shunping He1*
1 Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, People's Republic of China, 2 Graduate University of Chinese Academy of Sciences, Beijing, People's Republic of China, 3 Laboratory of Integrated Genomics, Biodiversity, and Conservation, Department of Biology, Saint Louis University, Saint Louis, Missouri, United States of America
Despite their great diversity and biological importance, evolutionary relationships among the endemic clade of East Asian Cyprinidae remain ambiguous. Understanding the phylogenetic history of this group involves many challenges. For instance, ecomorphological convergence may confound morphology-based phylogenetic inferences, and previous molecular phylogenetic studies based on single genes have often yielded contradictory and poorly supported trees. We assembled a comprehensive data matrix of 100 nuclear gene segments (~ 71132 base pairs) for representative species of the endemic East Asian cyprinid fauna and recovered a robust phylogeny from this genome-wide signal supported by multiple analytical methods, including maximum parsimony, maximum likelihood and Bayesian inference. Relaxed molecular clock analyses indicated species radiations of this clade concentrated at approximately 1.9–7.6 MYA. We provide evidence that the bursts of diversification in this fauna are directly linked to major paleoenvironmental events associated with monsoon evolution occurring from late Miocene to Pliocene. Ancestral state reconstruction reveals convergent morphological characters are hypothesized to be independent products of similar selective pressures in ecosystems. Our study is the first comprehensive phylogenetic study of the enigmatic East-Asian cyprinids. The explicit molecular phylogeny provides a valuable framework for future research in genome evolution, adaptation and speciation of cyprinids.
