气候变化领域集成服务门户(CCPortal): Influence of electron acceptor availability and microbial community structure on sedimentary methane oxidation in a boreal estuary

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DOI	10.1007/s10533-020-00660-z
	Influence of electron acceptor availability and microbial community structure on sedimentary methane oxidation in a boreal estuary
	Myllykangas J.-P.; Rissanen A.J.; Hietanen S.; Jilbert T.
发表日期	2020
ISSN	0168-2563
起始页码	291
结束页码	309
卷号	148 期号:3
英文摘要	Methane is produced microbially in vast quantities in sediments throughout the world’s oceans. However, anaerobic oxidation of methane (AOM) provides a near-quantitative sink for the produced methane and is primarily responsible for preventing methane emissions from the oceans to the atmosphere. AOM is a complex microbial process that involves several different microbial groups and metabolic pathways. The role of different electron acceptors in AOM has been studied for decades, yet large uncertainties remain, especially in terms of understanding the processes in natural settings. This study reports whole-core incubation methane oxidation rates along an estuarine gradient ranging from near fresh water to brackish conditions, and investigates the potential role of different electron acceptors in AOM. Microbial community structure involved in different methane processes is also studied in the same estuarine system using high throughput sequencing tools. Methane oxidation in the sediments was active in three distinct depth layers throughout the studied transect, with total oxidation rates increasing seawards. We find extensive evidence of non-sulphate AOM throughout the transect. The highest absolute AOM rates were observed below the sulphate-methane transition zone (SMTZ), strongly implicating the role of alternative electron acceptors (most likely iron and manganese oxides). However, oxidation rates were ultimately limited by methane availability. ANME-2a/b were the most abundant microbial phyla associated with AOM throughout the study sites, followed by ANME-2d in much lower abundances. Similarly to oxidation rates, highest abundances of microbial groups commonly associated with AOM were found well below the SMTZ, further reinforcing the importance of non-sulphate AOM in this system. © 2020, The Author(s).
英文关键词	16S rRNA gene; Baltic sea; High throughput sequencing; Methanotrophy; Radiotracer incubation
语种	英语
scopus关键词	atmosphere-ocean coupling; community structure; electron; estuarine sediment; marine sediment; methane; microbial community; oxidation; sediment chemistry
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153153
作者单位	Ecosystems and Environment Research Program, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65, Helsinki, 00014, Finland; Tvärminne Zoological Station, University of Helsinki, J.A. Palménintie 260, Hanko, 10900, Finland; Bio and Circular Economy Research Group, Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 10, Tampere, 33720, Finland
推荐引用方式 GB/T 7714	Myllykangas J.-P.,Rissanen A.J.,Hietanen S.,et al. Influence of electron acceptor availability and microbial community structure on sedimentary methane oxidation in a boreal estuary[J],2020,148(3).
APA	Myllykangas J.-P.,Rissanen A.J.,Hietanen S.,&Jilbert T..(2020).Influence of electron acceptor availability and microbial community structure on sedimentary methane oxidation in a boreal estuary.Biogeochemistry,148(3).
MLA	Myllykangas J.-P.,et al."Influence of electron acceptor availability and microbial community structure on sedimentary methane oxidation in a boreal estuary".Biogeochemistry 148.3(2020).