Patterns of bacterial biodiversity in the glacial meltwater streams of the McMurdo Dry Valleys, Antarctica.
Patterns of bacterial biodiversity in the glacial meltwater streams of the McMurdo Dry Valleys, Antarctica.
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DOI：
10.1093/femsec/fiw148
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发表时间：
2016-10
影响因子：
4.2
通讯作者：
David Van Horn;C. Wolf;D. Colman;Xiaoben Jiang;T. Kohler;D. McKnight;L. Stanish;Terrill Yazzie;C. Takacs-Vesbach
中科院分区：
文献类型：
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作者：
David Van Horn;C. Wolf;D. Colman;Xiaoben Jiang;T. Kohler;D. McKnight;L. Stanish;Terrill Yazzie;C. Takacs-Vesbach
微生物菌群控制着极地冰川融水流，包括麦克默多干谷（MDV），在那里它们在生理压力条件下茁壮成长。在这项研究中，我们研究了微生物垫类型和沉积物中发现的12个水文不同的流来描述社区的多样性和组成内和跨网站。对129个样品的16 S rRNA基因进行测序，揭示了24000个操作分类单位（<97%的DNA相似性），使溪流成为MDV生物多样性最丰富的栖息地。主坐标分析显示，在所有流（ANOSIM R-统计= 0.28），但更强的集群内流（ANOSIM R-统计从0.28至0.94）垫类型显着，但弱聚类。细菌多样性与垫无灰干质量之间存在显著相关性（P < 0.05），表明细菌多样性与各溪流的水文状况有关，可预测垫生物量。然而，流化学和社区成员之间的相关性较弱，可能反映了内部过程和水文条件的重要性。总的来说，这些结果表明，本地化的条件决定了细菌群落组成的相同垫类型和沉积物从不同的流，而MDV流的生物多样性热点，否则departamate景观，社区结构的控制是复杂的和特定的网站。
Microbial consortia dominate glacial meltwater streams from polar regions, including the McMurdo Dry Valleys (MDV), where they thrive under physiologically stressful conditions. In this study, we examined microbial mat types and sediments found in 12 hydrologically diverse streams to describe the community diversity and composition within and across sites. Sequencing of the 16S rRNA gene from 129 samples revealed ∼24 000 operational taxonomic units (<97% DNA similarity), making streams the most biodiverse habitat in the MDV. Principal coordinate analyses revealed significant but weak clustering by mat type across all streams (ANOSIM R-statistic = 0.28) but stronger clustering within streams (ANOSIM R-statistic from 0.28 to 0.94). Significant relationships (P < 0.05) were found between bacterial diversity and mat ash-free dry mass, suggesting that diversity is related to the hydrologic regimes of the various streams, which are predictive of mat biomass. However, correlations between stream chemistry and community members were weak, possibly reflecting the importance of internal processes and hydrologic conditions. Collectively, these results suggest that localized conditions dictate bacterial community composition of the same mat types and sediments from different streams, and while MDV streams are hotspots of biodiversity in an otherwise depauperate landscape, controls on community structure are complex and site specific.