Ancient origins determine global biogeography of hot and cold desert cyanobacteria

被引：162

作者：

Bahl, Justin ^{[2
]}

Lau, Maggie C. Y. ^{[1
]}

Smith, Gavin J. D. ^{[2
]}

Vijaykrishna, Dhanasekaran ^{[2
]}

Cary, S. Craig ^{[3
]}

Lacap, Donnabella C. ^{[1
]}

Lee, Charles K. ^{[3
]}

Papke, R. Thane ^{[4
]}

Warren-Rhodes, Kimberley A. ^{[5
]}

Wong, Fiona K. Y. ^{[1
]}

McKay, Christopher P. ^{[5
]}

Pointing, Stephen B. ^{[1
]}

机构：

[1] Univ Hong Kong, Sch Biol Sci, Hong Kong, Hong Kong, Peoples R China

[2] Duke NUS Grad Med Sch, Singapore 169857, Singapore

[3] Univ Waikato, Dept Biol Sci, Hamilton, New Zealand

[4] Univ Connecticut, Dept Mol & Cell Biol, Storrs, CT 06269 USA

[5] NASA, Ames Res Ctr, Div Space Sci, Moffett Field, CA 94035 USA

来源：

NATURE COMMUNICATIONS | 2011年 / 2卷

基金：

美国国家科学基金会;

关键词：

RIBOSOMAL-RNA GENES; MICROBIAL DIVERSITY; AGE; ARIDITY;

D O I：

10.1038/ncomms1167

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Factors governing large-scale spatio-temporal distribution of microorganisms remain unresolved, yet are pivotal to understanding ecosystem value and function. Molecular genetic analyses have focused on the influence of niche and neutral processes in determining spatial patterns without considering the temporal scale. Here, we use temporal phylogenetic analysis calibrated using microfossil data for a globally sampled desert cyanobacterium, Chroococcidiopsis, to investigate spatio-temporal patterns in microbial biogeography and evolution. Multilocus phylogenetic associations were dependent on contemporary climate with no evidence for distance-related patterns. Massively parallel pyrosequencing of environmental samples confirmed that Chroococcidiopsis variants were specific to either hot or cold deserts. Temporally scaled phylogenetic analyses showed no evidence of recent inter-regional gene flow, indicating populations have not shared common ancestry since before the formation of modern continents. These results indicate that global distribution of desert cyanobacteria has not resulted from widespread contemporary dispersal but is an ancient evolutionary legacy. This highlights the importance of considering temporal scales in microbial biogeography.

引用

页数：6

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