Microbial iron cycling is prevalent in water-logged Alaskan Arctic tundra habitats, but sensitive to disturbance
Microbial iron cycling is prevalent in water-logged Alaskan Arctic tundra habitats, but sensitive to disturbance
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微生物铁循环在淹水的阿拉斯加北极苔原栖息地中普遍存在，但对干扰敏感
DOI：
10.1093/femsec/fiad013
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发表时间：
2023
影响因子：
4.2
通讯作者：
Emerson, David
中科院分区：
文献类型：
--
作者：
Michaud, Alexander B.;Massé, Rémi O.;Emerson, David
连续多年冻土区的水淹生境为铁循环提供了广泛的缺氧-缺氧界面生境。铁循环与甲烷、磷循环相互作用，是冻土带生态地球化学的重要组成部分。我们的目标是表征微生物群落与铁循环内的自然和干扰栖息地的阿拉斯加北极苔原。我们对自然、未受干扰和生物干扰区域内的水生生境进行了采样，并对16 S rRNA基因进行了测序，以描述微生物群落，然后用处理速率和地球化学测量支持这些结果。未受干扰的栖息地的微生物群落与受干扰的栖息地有显着不同。已知参与铁和甲烷循环的微生物类群与自然栖息地显著相关，而它们与受干扰的地点不显著相关。未受干扰的栖息地有显着更高的可提取铁和更酸性比受干扰的栖息地采样。铁的减少是不可测量的干扰水生栖息地，并没有刺激增加生物铁垫。我们的研究强调了铁循环在未受干扰的水涝栖息地的普遍性，并表明，由于传统的砾石开采，冻土带的人为干扰，改变了水生栖息地的微生物学和破坏重要的地球化学循环在北极冻土带。
Water logged habitats in continuous permafrost regions provide extensive oxic-anoxic interface habitats for iron cycling. The iron cycle interacts with the methane and phosphorus cycles, and is an important part of tundra biogeochemistry. Our objective was to characterize microbial communities associated with the iron cycle within natural and disturbed habitats of the Alaskan Arctic tundra. We sampled aquatic habitats within natural, undisturbed and anthropogenically disturbed areas and sequenced the 16S rRNA gene to describe the microbial communities, then supported these results with process rate and geochemical measurements. Undisturbed habitats have microbial communities that are significantly different than disturbed habitats. Microbial taxa known to participate in the iron and methane cycles are significantly associated with natural habitats, whereas they are not significantly associated with disturbed sites. Undisturbed habitats have significantly higher extractable iron and are more acidic than disturbed habitats sampled. Iron reduction is not measurable in disturbed aquatic habitats and is not stimulated by the addition of biogenic iron mats. Our study highlights the prevalence of Fe-cycling in undisturbed water-logged habitats, and demonstrates that anthropogenic disturbance of the tundra, due to legacy gravel mining, alters the microbiology of aquatic habitats and disrupts important biogeochemical cycles in the Arctic tundra.