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首页> 美国卫生研究院文献>Frontiers in Microbiology >Metagenomic evidence for reciprocal particle exchange between the mainstem estuary and lateral bay sediments of the lower Columbia River
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Metagenomic evidence for reciprocal particle exchange between the mainstem estuary and lateral bay sediments of the lower Columbia River

机译：哥伦比亚河下游干河口和海湾横向沉积物相互交换颗粒的元基因组学证据

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Lateral bays of the lower Columbia River estuary are areas of enhanced water retention that influence net ecosystem metabolism through activities of their diverse microbial communities. Metagenomic characterization of sediment microbiota from three disparate sites in two brackish lateral bays (Baker and Youngs) produced ∼100 Gbp of DNA sequence data analyzed subsequently for predicted SSU rRNA and peptide-coding genes. The metagenomes were dominated by Bacteria. A large component of Eukaryota was present in Youngs Bay samples, i.e., the inner bay sediment was enriched with the invasive New Zealand mudsnail, Potamopyrgus antipodarum, known for high ammonia production. The metagenome was also highly enriched with an archaeal ammonia oxidizer closely related to Nitrosoarchaeum limnia. Combined analysis of sequences and continuous, high-resolution time series of biogeochemical data from fixed and mobile platforms revealed the importance of large-scale reciprocal particle exchanges between the mainstem estuarine water column and lateral bay sediments. Deposition of marine diatom particles in sediments near Youngs Bay mouth was associated with a dramatic enrichment of Bacteroidetes (58% of total Bacteria) and corresponding genes involved in phytoplankton polysaccharide degradation. The Baker Bay sediment metagenome contained abundant Archaea, including diverse methanogens, as well as functional genes for methylotrophy and taxonomic markers for syntrophic bacteria, suggesting that active methane cycling occurs at this location. Our previous work showed enrichments of similar anaerobic taxa in particulate matter of the mainstem estuarine water column. In total, our results identify the lateral bays as both sources and sinks of biogenic particles significantly impacting microbial community composition and biogeochemical activities in the estuary.
机译：哥伦比亚河下游河口的侧湾是保水能力增强的区域，可通过其各种微生物群落的活动影响净生态系统的新陈代谢。来自两个微咸侧湾（贝克和杨斯）三个不同地点的沉积物微生物群的元基因组学表征产生了约100 Gbp的DNA序列数据，随后对预测的SSU rRNA和肽编码基因进行了分析。元基因组主要由细菌组成。扬斯湾样品中存在真核生物的很大一部分，即，内湾沉积物富含入侵性新西兰泥螺，Potamopyrgus antipodarum，以产生高氨水而闻名。该元基因组还富含与硝化古菌（Nitrosoarchaeum limnia）密切相关的古细菌氨氧化剂。来自固定平台和移动平台的序列和连续，高分辨率时间序列的生物地球化学数据的综合分析表明，在主干河口水柱和海湾横向沉积物之间进行大规模相互颗粒交换非常重要。扬斯湾河口附近沉积物中海洋硅藻颗粒的沉积与拟杆菌（占细菌总数的58％）和涉及浮游植物多糖降解的相应基因的大量富集有关。贝克湾沉积物的基因组包含丰富的古细菌，包括各种产甲烷菌，以及甲基营养和功能性细菌的分类标记的功能基因，表明活跃的甲烷循环发生在这个位置。我们以前的工作表明，在主干河口水柱的颗粒物中富集了相似的厌氧类群。总的来说，我们的研究结果确定了侧湾​​是生物颗粒的源和汇，它们显着影响河口的微生物群落组成和生物地球化学活动。

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