DOI: 10.1016/j.quascirev.2018.04.029
Scopus记录号: 2-s2.0-85047379015
论文题名: Abundance and δ13C values of fatty acids in lacustrine surface sediments: Relationships with in-lake methane concentrations
作者: Stötter T. ; Bastviken D. ; Bodelier P.L.E. ; van Hardenbroek M. ; Rinta P. ; Schilder J. ; Schubert C.J. ; Heiri O.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 191 起始页码: 337
结束页码: 347
语种: 英语
英文关键词: Aquatic invertebrates
; Fatty acids
; Lakes
; Methane
; Methane oxidizing bacteria
; Sediment
; Stable carbon isotopes
Scopus关键词: Animals
; Anoxic sediments
; Bacteria
; Chains
; Ecosystems
; Lakes
; Methanation
; Methane
; Oxic sediments
; Polymerase chain reaction
; Sediments
; Statistical tests
; Surficial sediments
; Aquatic invertebrates
; Limited information
; Methane concentrations
; Methane oxidizing bacteria (MOB)
; Methane oxidizing bacterium
; Quantitative polymerase chain reaction
; Spearman's rank correlation
; Stable carbon isotopes
; Fatty acids
; abundance
; anoxic conditions
; anoxic sediment
; aquatic organism
; bacterium
; carbon isotope
; fatty acid
; invertebrate
; lacustrine deposit
; lacustrine environment
; lake ecosystem
; methane
; organic matter
; oxic conditions
; oxic sediment
; oxidation
; sediment chemistry
; stable isotope
; surficial sediment
; Europe
; Bacteria (microorganisms)
; Invertebrata
英文摘要: Proxy-indicators in lake sediments provide the only approach by which the dynamics of in-lake methane cycling can be examined on multi-decadal to centennial time scales. This information is necessary to constrain how lacustrine methane production, oxidation and emissions are expected to respond to global change drivers. Several of the available proxies for reconstructing methane cycle changes of lakes rely on interpreting past changes in the abundance or relevance of methane oxidizing bacteria (MOB), either directly (e.g. via analysis of bacterial lipids) or indirectly (e.g. via reconstructions of the past relevance of MOB in invertebrate diet). However, only limited information is available about the extent to which, at the ecosystem scale, variations in abundance and availability of MOB reflect past changes in in-lake methane concentrations. We present a study examining the abundances of fatty acids (FAs), particularly of 13C-depleted FAs known to be produced by MOB, relative to methane concentrations in 29 small European lakes. 39 surface sediment samples were obtained from these lakes and FA abundances were compared with methane concentrations measured at the lake surface, 10 cm above the sediments and 10 cm within the sediments. Three of the FAs in the surface sediment samples, C16:1ω7c, C16:1ω5c/t, and C18:1ω7c were characterized by lower δ13C values than the remaining FAs. We show that abundances of these FAs, relative to other short-chain FAs produced in lake ecosystems, are related with sedimentary MOB concentrations assessed by quantitative polymerase chain reaction (qPCR). We observed positive relationships between methane concentrations and relative abundances of C16:1ω7c, C16:1ω5c/t, and C18:1ω7c and the sum of these FAs. For the full dataset these relationships were relatively weak (Spearman's rank correlation (rs) of 0.34–0.43) and not significant if corrected for multiple testing. However, noticeably stronger and statistically significant relationships were observed when sediments from near-shore and deep-water oxic environments (rs = 0.57 to 0.62) and those from anoxic deep-water environment (rs = 0.55 to 0.65) were examined separately. Our results confirm that robust relationships exist between in-lake CH4 concentrations and 13C-depleted groups of FAs in the examined sediments, agreeing with earlier suggestions that the availability of MOB-derived, 13C-depleted organic matter for aquatic invertebrates increases with increasing methane concentrations. However, we also show that these relationships are complex, with different relationships observed for oxic and anoxic sediments and highest values measured in sediments deposited in oxic environments overlain with relatively methane-rich water. Furthermore, although all three 13C-depleted FA groups identified in our survey are known to be produced by MOB, they also receive contributions by other organism groups, and this will have influenced their distribution in our dataset. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112171
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Switzerland; Department of Thematic Studies – Water and Environmental Studies, Linköping University, Linköping, Sweden; Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; School of Geography, Politics and Sociology, Newcastle University, Newcastle, United Kingdom; Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland; EAWAG, Surface Waters – Research and Management, Kastanienbaum, Switzerland
Recommended Citation:
Stötter T.,Bastviken D.,Bodelier P.L.E.,et al. Abundance and δ13C values of fatty acids in lacustrine surface sediments: Relationships with in-lake methane concentrations[J]. Quaternary Science Reviews,2018-01-01,191