Ancient origins determine global biogeography of hot and cold desert cyanobacteria.
Ancient origins determine global biogeography of hot and cold desert cyanobacteria.
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DOI：
10.1038/ncomms1167
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发表时间：
2011-01-25
影响因子：
16.6
通讯作者：
Pointing, Stephen B.
中科院分区：
文献类型：
--
作者：
Bahl, Justin;Lau, Maggie C. Y.;Smith, Gavin J. D.;Vijaykrishna, Dhanasekaran;Cary, S. Craig;Lacap, Donnabella C.;Lee, Charles K.;Papke, R. Thane;Warren-Rhodes, Kimberley A.;Wong, Fiona K. Y.;McKay, Christopher P.;Pointing, Stephen B.
微生物大规模时空分布的控制因素尚未得到解决，但对于理解生态系统的价值和功能至关重要。分子遗传分析集中在生态位和中性过程的影响，在确定空间格局，而不考虑时间尺度。在这里，我们使用时间系统发育分析校准使用微体化石数据的全球采样的沙漠蓝藻，Chroococcidiopsis，调查时空模式的微生物群落学和进化。多位点的系统发育协会依赖于当代气候，没有证据的距离相关的模式。环境样品的大规模平行焦磷酸测序证实，Chroococcidiopsis变种是特定于炎热或寒冷的沙漠。时间尺度的系统发育分析显示，没有证据表明最近的区域间基因流，表明人口没有共享共同的祖先，因为现代大陆形成之前。这些结果表明，全球分布的沙漠蓝藻并没有导致广泛的当代分散，而是一个古老的进化遗产。这突出了在微生物群落学中考虑时间尺度的重要性。 微生物在许多环境中都很丰富，了解它们在生态系统之间的传播对于生态学和保护非常重要。这些作者证明，蓝藻种群是特定于炎热或寒冷的沙漠，不同种群之间的基因流动不会发生。
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. Microorganisms are abundant in many environments and understanding their dispersal between ecosystems is important for ecology and conservation. These authors demonstrate that cyanobacterial populations are specific to hot or cold deserts and that gene flow between different populations does not occur.
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