干旱区生态环境知识资源中心(Arid): Biogeographical note on Antarctic microflorae: Endemism and cosmopolitanism

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	Biogeographical note on Antarctic microflorae: Endemism and cosmopolitanism
	Jadoon Waqar Azeem; Nakai Ryosuke; Naganuma Takeshi
来源期刊	Geoscience Frontiers
ISSN	1674-9871
出版年	2013
卷号	4 期号:6 页码:633-646
英文摘要	This study deals with the biogeography of Antarctic microflora (Antarctica acts as best model to study microbial biogeography) such as cyanobacteria and selected halophiles with special emphasis on Halomonas variabilis and Bacillus licheniformis. Halophiles are known to be resistant not only to salt stress, but also to extreme temperature, pressure, and aridity and they are capable of surviving in harsh environments such as polar regions, deep-sea habitats, and deserts. Many microbes are known to be resistant to hostile environmental conditions, and are capable of surviving in harsh environments. Our group has isolated 444 strains belonging to 28 genera of halophiles from various environments around the world. The 16S rRNA gene sequences revealed that many of the isolated strains from geographically distant habitats having different environmental conditions, were closely related to each other, with some strains possessing 100% identical sequences. Organisms possessing survival mechanism such as spore formation are usually ubiquitous. The genus Halomonas is represented by potentially endemic strains and the ubiquitous H. variabilis, while spore-forming B. licheniformis showed cosmopolitan distribution. One potentially endemic (moderate endemicity that is regional and/or continental distribution) strain was reported from Syowa station, East Antarctica, and Mario Zucchelli station, West Antarctica, which are geographically separated by 3000 km. Moreover, 15 strains having 100% similarity with B. licheniformis were considered cosmopolitans. The results of this work provide support for the middle-ground model that some microbes have moderate endemicity and others have cosmopolitan distribution. These results will contribute to a greater understanding of microbial biogeography with special emphasis on Antarctica.
英文关键词	Biogeography Cyanobacteria Halophilic bacteria 16S rRNA Molecular phylogeny
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:4970864
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335273
作者单位	Jadoon Waqar Azeem, Graduate School of Biosphere Science, Hiroshima University(Japan), Hiroshima 739-8528, Japan.; Naganuma Takeshi, Graduate School of Biosphere Science, Hiroshima University(Japan), Hiroshima 739-8528, Japan.; Nakai Ryosuke, National Institute of Genetics(Japan), Shizuoka 411-8540, Japan.
推荐引用方式 GB/T 7714	Jadoon Waqar Azeem,Nakai Ryosuke,Naganuma Takeshi. Biogeographical note on Antarctic microflorae: Endemism and cosmopolitanism[J],2013,4(6):633-646.
APA	Jadoon Waqar Azeem,Nakai Ryosuke,&Naganuma Takeshi.(2013).Biogeographical note on Antarctic microflorae: Endemism and cosmopolitanism.Geoscience Frontiers,4(6),633-646.
MLA	Jadoon Waqar Azeem,et al."Biogeographical note on Antarctic microflorae: Endemism and cosmopolitanism".Geoscience Frontiers 4.6(2013):633-646.