Phylogenetic Composition of Rocky Mountain Endolithic Microbial Ecosystems
Phylogenetic Composition of Rocky Mountain Endolithic Microbial Ecosystems
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DOI：
10.1128/aem.02656-06
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发表时间：
2007-04
影响因子：
4.4
通讯作者：
Jeffrey J. Walker;N. Pace
中科院分区：
文献类型：
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作者：
Jeffrey J. Walker;N. Pace
摘要内石器环境是岩石中的孔隙空间，是微生物普遍存在的栖息地。以光合作用为基础的内石器时代群落居住在暴露于地表的岩石的外部几毫米到几厘米。这种内石器生态系统被认为是理解微生物生态学基本原理的简单易行的模型。为了测试以前设想的假说有关内石器生态系统，我们研究了选定的内石器社区在美国落基山脉地区与文化无关的分子方法。通过测定rRNA基因序列含量确定群落组成，并利用统计系统发育方法对群落进行比较。结果表明，内石器生态系统是从一个选择，全球metacompatibility播种，并形成真正的生态群落，是已知的最简单的微生物生态系统之一。统计分析表明，控制群落组成的地理特征，如岩石类型，比预测的要复杂。总的来说，这项研究的结果支持这样的想法，即微生物多样性的模式中发现的内石器时代的社区是由类似的宏观生态系统中观察到的原则。
ABSTRACT The endolithic environment, the pore space in rocks, is a ubiquitous microbial habitat. Photosynthesis-based endolithic communities inhabit the outer few millimeters to centimeters of rocks exposed to the surface. Such endolithic ecosystems have been proposed as simple, tractable models for understanding basic principles in microbial ecology. In order to test previously conceived hypotheses about endolithic ecosystems, we studied selected endolithic communities in the Rocky Mountain region of the United States with culture-independent molecular methods. Community compositions were determined by determining rRNA gene sequence contents, and communities were compared using statistical phylogenetic methods. The results indicate that endolithic ecosystems are seeded from a select, global metacommunity and form true ecological communities that are among the simplest microbial ecosystems known. Statistical analysis showed that biogeographical characteristics that control community composition, such as rock type, are more complex than predicted. Collectively, results of this study support the idea that patterns of microbial diversity found in endolithic communities are governed by principles similar to those observed in macroecological systems.