气候变化领域集成服务门户(CCPortal): Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea

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DOI	10.1111/gbi.12338
	Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea
	More K.D.; Giosan L.; Grice K.; Coolen M.J.L.
发表日期	2019
ISSN	14724677
起始页码	436
结束页码	448
卷号	17 期号:4
英文摘要	Subsurface microbial communities are generally thought to be structured through in situ environmental conditions such as the availability of electron acceptors and donors and porosity, but recent studies suggest that the vertical distribution of a subset of subseafloor microbial taxa, which were present at the time of deposition, were selected by the paleodepositional environment. However, additional highly resolved temporal records of subsurface microbiomes and paired paleoenvironmental reconstructions are needed to justify this claim. Here, we performed a highly resolved shotgun metagenomics survey to study the taxonomic and functional diversity of the subsurface microbiome in Holocene sediments underlying the permanently stratified and anoxic Black Sea. Obligate aerobic bacteria made the largest contribution to the observed shifts in microbial communities associated with known Holocene climate stages and transitions. This suggests that the aerobic fraction of the subseafloor microbiome was seeded from the water column and did not undergo post-depositional selection. In contrast, obligate and facultative anaerobic bacteria showed the most significant response to the establishment of modern-day environmental conditions 5.2 ka ago that led to a major shift in planktonic communities and in the type of sequestered organic matter available for microbial degradation. No significant shift in the subseafloor microbiome was observed as a result of environmental changes that occurred shortly after the marine reconnection, 9 ka ago. This supports the general view that the marine reconnection was a gradual process. We conclude that a high-resolution analysis of downcore changes in the subseafloor microbiome can provide detailed insights into paleoenvironmental conditions and biogeochemical processes that occurred at the time of deposition. © 2019 John Wiley & Sons Ltd
关键词	anoxic conditions bacterium climate variation Holocene in situ measurement microbial community reconstruction taxonomy vertical distribution water column Black Sea bacterial phenomena and functions bacterium Black Sea Bulgaria classification fossil genetics metagenome microbiology microflora sediment Bacteria Bacterial Physiological Phenomena Black Sea Bulgaria Fossils Geologic Sediments Metagenome Microbiota
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/133227
推荐引用方式 GB/T 7714	More K.D.,Giosan L.,Grice K.,et al. Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea[J]. Geobiology,2019,17(4).
APA	More K.D.,Giosan L.,Grice K.,&Coolen M.J.L..(2019).Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea.,17(4).
MLA	More K.D.,et al."Holocene paleodepositional changes reflected in the sedimentary microbiome of the Black Sea".17.4(2019).