globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12271
Scopus记录号: 2-s2.0-85040740223
论文题名:
Abrupt burial imparts persistent changes to the bacterial diversity of turbidite-associated sediment profiles
作者: Harrison B.K.; Myrbo A.; Flood B.E.; Bailey J.V.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期:2
起始页码: 190
结束页码: 202
语种: 英语
Scopus关键词: bacterium ; burial (geology) ; community response ; debris flow ; environmental conditions ; identification method ; microbial community ; preservation ; prokaryote ; sediment transport ; sediment-water interface ; species diversity ; turbidite ; California ; Hennepin County ; La Jolla ; Minnesota ; San Diego ; Twin Lakes [California] ; United States ; Bacteria (microorganisms) ; Chloroflexi ; Chloroflexi (class) ; Deltaproteobacteria
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The emplacement of subaqueous gravity-driven sediment flows imposes a significant physical and geochemical impact on underlying sediment and microbial communities. Although previous studies have established lasting mineralogical and biological signatures of turbidite deposition, the response of bacteria and archaea within and beneath debris flows remains poorly constrained. Both bacterial cells associated with the underlying sediment and those attached to allochthonous material must respond to substantially altered environmental conditions and selective pressures. As a consequence, turbidites and underlying sediments provide an exceptional opportunity to examine (i) the microbial community response to rapid sedimentation and (ii) the preservation and identification of displaced micro-organisms. We collected Illumina MiSeq sequence libraries across turbidite boundaries at ~26 cm sediment depth in La Jolla Canyon off the coast of California, and at ~50 cm depth in meromictic Twin Lake, Hennepin County, MN. 16S rRNA gene signatures of relict and active bacterial populations exhibit persistent differences attributable to turbidite deposition. In particular, both the marine and lacustrine turbidite boundaries are sharply demarcated by the abundance and diversity of Chloroflexi, suggesting a characteristic sensitivity to sediment disturbance history or to differences in organic substrates across turbidite profiles. Variations in the abundance of putative dissimilatory sulfate-reducing Deltaproteobacteria across the buried La Jolla Canyon sediment–water interface reflect turbidite-induced changes to the geochemical environment. Species-level distinctions within the Deltaproteobacteria clearly conform to the sedimentological boundary, suggesting a continuing impact of genetic inheritance distinguishable from broader trends attributable to selective pressure. Abrupt, <1-cm scale changes in bacterial diversity across the Twin Lake turbidite contact are consistent with previous studies showing that relict DNA signatures attributable to sediment transport may be more easily preserved in low-energy, anoxic environments. This work raises the possibility that deep subsurface microbial communities may inherit variations in microbial diversity from sediment flow and deformation events. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85018
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Earth and Atmospheric Sciences, Central Michigan University, Mt. Pleasant, MI, United States; Department of Earth Sciences, University of Minnesota, Twin Cities, Minneapolis, MN, United States; LacCore/CSDCO, Limnological Research Center, Department of Earth Sciences, University of Minnesota, Twin Cities, Minneapolis, MN, United States

Recommended Citation:
Harrison B.K.,Myrbo A.,Flood B.E.,et al. Abrupt burial imparts persistent changes to the bacterial diversity of turbidite-associated sediment profiles[J]. Geobiology,2018-01-01,16(2)
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