Soil bacterial diversity in the Arctic is not fundamentally different from that found in other biomes
Soil bacterial diversity in the Arctic is not fundamentally different from that found in other biomes
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DOI：
10.1111/j.1462-2920.2010.02277.x
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发表时间：
2010-11-01
影响因子：
5.1
通讯作者：
Grogan, Paul
中科院分区：
文献类型：
--
作者：
Chu, Haiyan;Fierer, Noah;Grogan, Paul
与低纬度地区相比，北极地区严峻的环境压力可能促进了独特的土壤细菌群落。在这里，我们使用高分辨率条形码焦磷酸测序技术对北极土壤细菌群落的生物地理学进行了全面分析。我们还将北极土壤与来自更广泛的温带生物群落的土壤进行了比较，以表征全球土壤细菌群落的可变性。研究表明，北极土壤细菌群落的组成和多样性是根据当地土壤pH值的变化而不是邻近地点的地理邻近性来构建的，这表明在决定群落水平差异方面，当地环境异质性远比扩散限制重要。此外，北极土壤中细菌群落组成的变异性、丰富度和系统发育多样性水平与广泛的低纬度土壤相似，这强烈表明全球土壤细菌群落存在共同的多样性结构。这些结果与动物和植物多样性的既定纬度梯度形成对比，表明对细菌群落分布的控制与对大型生物的观察有根本不同，并且我们的生物群系定义对于预测全球土壤细菌群落的变异性没有帮助。
P>The severe environmental stresses of the Arctic may have promoted unique soil bacterial communities compared with those found in lower latitude environments. Here, we present a comprehensive analysis of the biogeography of soil bacterial communities in the Arctic using a high resolution bar-coded pyrosequencing technique. We also compared arctic soils with soils from a wide range of more temperate biomes to characterize variability in soil bacterial communities across the globe. We show that arctic soil bacterial community composition and diversity are structured according to local variation in soil pH rather than geographical proximity to neighboring sites, suggesting that local environmental heterogeneity is far more important than dispersal limitation in determining community-level differences. Furthermore, bacterial community composition had similar levels of variability, richness and phylogenetic diversity within arctic soils as across soils from a wide range of lower latitudes, strongly suggesting a common diversity structure within soil bacterial communities around the globe. These results contrast with the well-established latitudinal gradients in animal and plant diversity, suggesting that the controls on bacterial community distributions are fundamentally different from those observed for macro-organisms and that our biome definitions are not useful for predicting variability in soil bacterial communities across the globe.