气候变化领域集成服务门户(CCPortal): Microbial communities associated with phosphogenic sediments and phosphoclast-associated DNA of the Benguela upwelling system

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DOI	10.1111/gbi.12318
	Microbial communities associated with phosphogenic sediments and phosphoclast-associated DNA of the Benguela upwelling system
	Zoss R.; Medina Ferrer F.; Flood B.E.; Jones D.S.; Louw D.; Bailey J.
发表日期	2019
ISSN	14724677
起始页码	76
结束页码	90
卷号	17 期号:1
英文摘要	The processes that lead to the precipitation of authigenic calcium phosphate minerals in certain marine pore waters remain poorly understood. Phosphogenesis occurs in sediments beneath some oceanic upwelling zones that harbor polyphosphate-accumulating bacteria. These bacteria are believed to concentrate phosphate in sediment pore waters, creating supersaturated conditions with respect to apatite precursors. However, the relationship between microbes and phosphorite formation is not fully resolved. To further study this association, we examined microbial community data generated from two sources: sediment cores recovered from the shelf of the Benguela upwelling region where phosphorites are currently forming, and DNA preserved within phosphoclasts recovered from a phosphorite deposit along the Benguela shelf. iTag and clone library sequencing of the 16S rRNA gene showed that many of our sediment-hosted communities shared large numbers of phylotypes with one another, and that the same metabolic guilds were represented at localities across the shelf. Sulfate-reducing bacteria and sulfur-oxidizing bacteria were particularly abundant in our datasets, as were phylotypes that are known to carry out nitrification and the anaerobic oxidation of ammonium. The DNA extracted from phosphoclasts contained the signature of a distinct microbial community from those observed in the modern sediments. While some aspects of the modern and phosphoclast communities were similar, we observed both an enrichment of certain common microbial classes found in the modern phosphogenic sediments and a relative depletion of others. The phosphoclast-associated DNA could represent a relict signature of one or more microbial assemblages that were present when the apatite or its precursors precipitated. While these taxa may or may not have contributed to the precipitation of the apatite that now hosts their genetic remains, several groups represented in the phosphoclast extract dataset have the genetic potential to metabolize polyphosphate, and perhaps modulate phosphate concentrations in pore waters where carbonate fluorapatite (or its precursors) are known to be precipitating. © 2018 John Wiley & Sons Ltd
关键词	anaerobic digestion bacterium calcium marine sediment microbial community oxidation phosphogenesis porewater sediment core sulfate-reducing bacterium upwelling Angola Benguela bacterial DNA mineral phosphate phosphorite aquatic species Atlantic Ocean bacterium chemistry metabolism sediment Aquatic Organisms Atlantic Ocean Bacteria DNA, Bacterial Geologic Sediments Minerals Phosphates
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/133251
推荐引用方式 GB/T 7714	Zoss R.,Medina Ferrer F.,Flood B.E.,et al. Microbial communities associated with phosphogenic sediments and phosphoclast-associated DNA of the Benguela upwelling system[J]. Geobiology,2019,17(1).
APA	Zoss R.,Medina Ferrer F.,Flood B.E.,Jones D.S.,Louw D.,&Bailey J..(2019).Microbial communities associated with phosphogenic sediments and phosphoclast-associated DNA of the Benguela upwelling system.,17(1).
MLA	Zoss R.,et al."Microbial communities associated with phosphogenic sediments and phosphoclast-associated DNA of the Benguela upwelling system".17.1(2019).