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首页> 美国卫生研究院文献>Scientific Reports >Rapid peat accumulation favours the occurrence of both fen and bog microbial communities within a Mediterranean free-floating peat island
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Rapid peat accumulation favours the occurrence of both fen and bog microbial communities within a Mediterranean free-floating peat island

机译：泥炭的快速积累有利于地中海自由漂浮的泥炭岛中和沼泽微生物群落的发生

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摘要

The unique environment of a 4m-thick, free-floating peat island within the Posta Fibreno lake (Central Italy) was analyzed using DNA-based techniques to assess bacterial and fungal community members identity and abundance. Two depths were sampled at 41 and 279 cm from the surface, the former corresponding to an emerged portion of Sphagnum residues accumulated less than 30 yrs ago, and the latter mainly consisting of silty peat belonging to the deeply submerged part of the island, dating back to 1520–1660 AD. The corresponding communities were very diverse, each of them dominated by a different member of the Delta-proteobacteria class for prokaryotes. Among Eukaryotes, Ascomycota prevailed in the shallow layer while Basidiomycota were abundant in the deep sample. The identity of taxa partitioning between acidic surface layer and neutral core is very reminiscent of the differences reported between bogs and fens respectively, supporting the view of Posta Fibreno as a relic transitional floating mire. Moreover, some microbial taxa show an unusual concurrent species convergence between this sub-Mediterranean site and far Nordic or circumpolar environments. This study represents the first report describing the biotic assemblages of such a peculiar environment, and provides some insights into the possible mechanisms of its evolution.
机译：使用基于DNA的技术分析了Posta Fibreno湖（意大利中部）内一个4m厚，自由漂浮的泥炭岛的独特环境，以评估细菌和真菌群落成员的身份和数量。在距地面41和279 cm处采样了两个深度，前者对应于不到30年之前积累的泥炭藓残渣的出现部分，后者主要由属于该岛深层淹没部分的粉质泥炭组成，其历史可追溯至至公元1520–1660年。相应的社区非常多样化，每个社区都由原核生物的Delta-proteobacteria类的一个不同成员主导。在真核生物中，子囊菌在浅层中占优势，而担子菌在深层中占优势。酸性表面层和中性核之间的分类单元划分的身份非常令人联想到沼泽和之间分别的差异，这支持了Posta Fibreno作为遗迹过渡浮泥的观点。此外，某些微生物分类群显示出该地中海次站点与北欧或远极环境之间并发的物种并发异常。这项研究代表了描述这种特殊环境的生物组合的第一份报告，并提供了对其进化的可能机制的一些见解。

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