DOI: 10.1007/s00531-015-1219-6
Scopus记录号: 2-s2.0-84940963557
论文题名: Microbial abundance in lacustrine sediments: a case study from Lake Van, Turkey
作者: Kallmeyer J. ; Grewe S. ; Glombitza C. ; Kitte J.A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 6 起始页码: 1667
结束页码: 1677
语种: 英语
英文关键词: Cell counts
; Deep biosphere
; Lacustrine sediment
; Lake Van
; Subsurface biosphere
Scopus关键词: biosphere
; lacustrine deposit
; microbial activity
; microbial community
; microbial ecology
; relative abundance
; Lake Van
; Turkey
英文摘要: The ICDP “PaleoVan” drilling campaign at Lake Van, Turkey, provided a long (>100 m) record of lacustrine subsurface sedimentary microbial cell abundance. After the ICDP campaign at Potrok Aike, Argentina, this is only the second time deep lacustrine cell counts have been documented. Two sites were cored and revealed a strikingly similar cell distribution despite differences in organic matter content and microbial activity. Although shifted towards higher values, cell counts from Lake Potrok Aike, Argentina, reveal very similar distribution patterns with depth. The lacustrine cell count data are significantly different from published marine records; the most probable cause is differences in sedimentary organic matter composition with marine sediments containing a higher fraction of labile organic matter. Previous studies showed that microbial activity and abundance increase centimetres to metres around geologic interfaces. The finely laminated Lake Van sediment allowed studying this phenomenon on the microscale. We sampled at the scale of individual laminae, and in some depth intervals, we found large differences in microbial abundance between the different laminae. This small-scale heterogeneity is normally overlooked due to much larger sampling intervals that integrate over several centimetres. However, not all laminated intervals exhibit such large differences in microbial abundance, and some non-laminated horizons show large variability on the millimetre scale as well. The reasons for such contrasting observations remain elusive, but indicate that heterogeneity of microbial abundance in subsurface sediments has not been taken into account sufficiently. These findings have implications not just for microbiological studies but for geochemistry as well, as the large differences in microbial abundance clearly show that there are distinct microhabitats that deviate considerably from the surrounding layers. © 2015, The Author(s). URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940963557&doi=10.1007%2fs00531-015-1219-6&partnerID=40&md5=a75517f084f8dfe188e7cf64a1526c52
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70267
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany; Earth and Environmental Sciences, University of Potsdam, Karl-Liebknecht Straße, Potsdam, Germany; Center for Geomicrobiology, Aarhus University, Ny Munkegade 114, Århus C, Denmark
Recommended Citation:
Kallmeyer J.,Grewe S.,Glombitza C.,et al. Microbial abundance in lacustrine sediments: a case study from Lake Van, Turkey[J]. International Journal of Earth Sciences,2015-01-01,104(6)