Protistan microbial observatory in the Cariaco Basin, Caribbean. II. Habitat specialization
Protistan microbial observatory in the Cariaco Basin, Caribbean. II. Habitat specialization
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DOI：
10.1038/ismej.2011.7
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发表时间：
2011-08-01
期刊：
影响因子：
11
通讯作者：
Epstein, Slava
中科院分区：
文献类型：
--
作者：
Orsi, William;Edgcomb, Virginia;Epstein, Slava
这是三篇系列论文中的第二篇，研究了委内瑞拉Cariaco盆地（海洋最大的缺氧海洋盆地）的真核微生物多样性和分类群分布。在这里，我们使用系统发育信息，多变量社区分析和统计丰富度预测，以测试原生生物是否表现出栖息地专业化定义的地球化学层的水柱。我们还分析了原生生物的时空分布在两个季节和两个地理位置内的盆地。非度量多维尺度表明，这两个盆地的网站居住的不同原生生物组合，观察到的采样点的观测和预测的丰富性的最小重叠的支持。参数丰富度估计的比较表明，原生生物群落在紧密的空间，但地球化学不同的栖息地是非常不同的，并可能共享少至5%的总业务分类单位（OTUs）。这得到了典型对应分析的支持，表明经验观察到的OTU在氧化剂和还原剂中沿沿着相反的梯度组织。我们的系统发育分析确定了许多新的分支，在物种的阶级水平，其中一些出现限制特定层的水柱，并有显着的非随机分布。这些发现表明，许多浮游原生生物仅限于特定的栖息地，并可能多样化，至少部分是由于地球化学障碍的分离。The ISME Journal（2011）5，1357-1373; doi：10.1038/ismej.2011.7; 2011年3月10日在线发表
This is the second paper in a series of three that investigates eukaryotic microbial diversity and taxon distribution in the Cariaco Basin, Venezuela, the ocean's largest anoxic marine basin. Here, we use phylogenetic information, multivariate community analyses and statistical richness predictions to test whether protists exhibit habitat specialization within defined geochemical layers of the water column. We also analyze spatio-temporal distributions of protists across two seasons and two geographic sites within the basin. Non-metric multidimensional scaling indicates that these two basin sites are inhabited by distinct protistan assemblages, an observation that is supported by the minimal overlap in observed and predicted richness of sampled sites. A comparison of parametric richness estimations indicates that protistan communities in closely spaced-but geochemically different-habitats are very dissimilar, and may share as few as 5% of total operational taxonomic units (OTUs). This is supported by a canonical correspondence analysis, indicating that the empirically observed OTUs are organized along opposing gradients in oxidants and reductants. Our phylogenetic analyses identify many new clades at species to class levels, some of which appear restricted to specific layers of the water column and have a significantly nonrandom distribution. These findings suggest many pelagic protists are restricted to specific habitats, and likely diversify, at least in part due to separation by geochemical barriers. The ISME Journal (2011) 5, 1357-1373; doi: 10.1038/ismej.2011.7; published online 10 March 2011