气候变化领域集成服务门户(CCPortal): Microbial metabolite fluxes in a model marine anoxic ecosystem

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DOI	10.1111/gbi.12357
	Microbial metabolite fluxes in a model marine anoxic ecosystem
	Louca S.; Astor Y.M.; Doebeli M.; Taylor G.T.; Scranton M.I.
发表日期	2019
ISSN	14724677
起始页码	628
结束页码	642
卷号	17 期号:6
英文摘要	Permanently anoxic regions in the ocean are widespread and exhibit unique microbial metabolic activity exerting substantial influence on global elemental cycles and climate. Reconstructing microbial metabolic activity rates in these regions has been challenging, due to the technical difficulty of direct rate measurements. In Cariaco Basin, which is the largest permanently anoxic marine basin and an important model system for geobiology, long-term monitoring has yielded time series for the concentrations of biologically important compounds; however, the underlying metabolite fluxes remain poorly quantified. Here, we present a computational approach for reconstructing vertical fluxes and in situ net production/consumption rates from chemical concentration data, based on a 1-dimensional time-dependent diffusive transport model that includes adaptive penalization of overfitting. We use this approach to estimate spatiotemporally resolved fluxes of oxygen, nitrate, hydrogen sulfide, ammonium, methane, and phosphate within the sub-euphotic Cariaco Basin water column (depths 150–900 m, years 2001–2014) and to identify hotspots of microbial chemolithotrophic activity. Predictions of the fitted models are in excellent agreement with the data and substantially expand our knowledge of the geobiology in Cariaco Basin. In particular, we find that the diffusivity, and consequently fluxes of major reductants such as hydrogen sulfide, and methane, is about two orders of magnitude greater than previously estimated, thus resolving a long-standing apparent conundrum between electron donor fluxes and measured dark carbon assimilation rates. © 2019 John Wiley & Sons Ltd
关键词	metabolism metabolite methane microbial activity redox conditions Atlantic Ocean Cariaco Basin Caribbean Sea sea water anaerobic growth archaeon bacterium chemistry chemoautotrophy metabolism microflora theoretical model Venezuela Anaerobiosis Archaea Bacteria Chemoautotrophic Growth Microbiota Models, Theoretical Seawater Venezuela
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133218
推荐引用方式 GB/T 7714	Louca S.,Astor Y.M.,Doebeli M.,et al. Microbial metabolite fluxes in a model marine anoxic ecosystem[J]. Geobiology,2019,17(6).
APA	Louca S.,Astor Y.M.,Doebeli M.,Taylor G.T.,&Scranton M.I..(2019).Microbial metabolite fluxes in a model marine anoxic ecosystem.,17(6).
MLA	Louca S.,et al."Microbial metabolite fluxes in a model marine anoxic ecosystem".17.6(2019).