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Influence of Spatial Scale on Structure of Soil Bacterial Communities across an Arctic Landscape

机译：空间规模对北极景观土壤细菌社区结构的影响

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Bacterial community composition is largely influenced by environmental factors, and this applies to the Arctic region. However, little is known about the role of spatial factors in structuring such communities. In this study, we evaluated the influence of spatial scale on bacterial community structure across an Arctic landscape. Our results showed that spatial factors accounted for approximately 10% of the variation at the landscape scale, equivalent to observations across the whole Arctic region, suggesting that while the role and magnitude of other processes involved in community structure may vary, the role of dispersal may be stable globally in the region. We assessed dispersal limitation by identifying the spatial autocorrelation distance which would be required in order to obtain fully independent samples as approximately 60 m, and this may inform future sampling strategies in the region. Finally, indicator taxa with strong statistical correlations with environmental variables were identified. However, we showed that these strong taxon-environment associations may not always be reflected in the geographical distribution of these taxa.IMPORTANCE The significance of this study is 3-fold. It investigated the influence of spatial scale on the soil bacterial community composition across a typical Arctic landscape and demonstrated that conclusions reached when examining the influence of specific environmental variables on bacterial community composition are dependent upon the spatial scales over which they are investigated. This study identified a dispersal limitation (spatial autocorrelation) distance of approximately 60 m, required to obtain samples with fully independent bacterial communities and, therefore, should serve to inform future sampling strategies in the region and potentially elsewhere. The work also showed that strong taxon-environment statistical associations may not be reflected in the observed landscape distribution of the indicator taxa.
机译：细菌群落组成在很大程度上受到环境因素的影响，这适用于北极地区。然而，关于空间因素在构建此类社区的作用很少。在这项研究中，我们评估了空间尺度对北极景观细菌群落结构的影响。我们的研究结果表明，空间因素占景观量表中变异的约10％，相当于整个北极地区的观察结果，这表明虽然社区结构所涉及的其他进程的作用和程度可能有所不同，但散列可能的作用在该地区全球稳定。我们通过识别出现空间自相关距离来评估分散限制，以便获得大约60米的完全独立的样本，这可能会通知该地区的未来采样策略。最后，确定了具有强烈与环境变量的统计相关性的指标分类卡。但是，我们表明，这些强大的分类群环境协会可能并不总是反映在这些分类群的地理分布中。分析本研究的重要性为3倍。它研究了空间尺度对典型北极景观土壤细菌群落组成的影响，并证明了检查特定环境变量对细菌群落组合物的影响的结论取决于他们研究的空间尺度。本研究确定了具有完全独立的细菌社区的样品所需的分散限制（空间自相关）距离约为60米，因此应该有助于在该地区的未来采样策略和其他地方提供信息。这项工作还表明，强大的分类环境统计协会可能不会被反映在观察到的指标分类群的景观分布中。

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