Insoluble prokaryotic membrane lipids in a Sphagnum peat: Implications for organic matter preservation

Lidia Chaves Torres; Richard D. Pancost

doi:10.1016/j.orggeochem.2015.12.013

Insoluble prokaryotic membrane lipids in a Sphagnum peat: Implications for organic matter preservation

Lidia Chaves Torres^*
, Richard D. Pancost

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

16 Citations (Scopus)

Abstract

Preservation of organic matter (OM) in the geosphere has a direct impact on carbon bioavailability, the carbon cycle and the formation of fossil fuels. We have examined some of the processes that lead to the preservation of OM by characterising insoluble OM in a Sphagnum peat bog. We focussed on the partitioning of prokaryotic biomarkers between solvent-extractable and insoluble OM fractions and how that partitioning changed with depth. The insoluble organic matter (IOM) was examined using stepwise chemical degradation involving base and acid hydrolysis. Iso- and anteiso-C₁₅ and C₁₇ fatty acids (FAs), hopanoic acid and bishomohopanol, and branched glycerol dialkyl glycerol tetraethers (GDGTs) - diagnostic for Bacteria - were targeted as well as archaeol and isoprenoidal GDGTs - diagnostic for Archaea. High percentages of these compounds - up to 65% - occur in IOM pools, indicating that archaeal- and bacterially derived OM is prone to insolubilization even in shallow sediments (

Original language	English
Pages (from-to)	77-91
Number of pages	15
Journal	Organic Geochemistry
Volume	93
Early online date	6 Jan 2016
DOIs	https://doi.org/10.1016/j.orggeochem.2015.12.013
Publication status	Published - 1 Mar 2016

Keywords

Archaeol
Branched fatty acids
Early diagenesis
GDGTs
Selective chemical degradation

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@article{efda38ca5e7b4c3788f042a95d1863cc,

title = "Insoluble prokaryotic membrane lipids in a Sphagnum peat: Implications for organic matter preservation",

abstract = "Preservation of organic matter (OM) in the geosphere has a direct impact on carbon bioavailability, the carbon cycle and the formation of fossil fuels. We have examined some of the processes that lead to the preservation of OM by characterising insoluble OM in a Sphagnum peat bog. We focussed on the partitioning of prokaryotic biomarkers between solvent-extractable and insoluble OM fractions and how that partitioning changed with depth. The insoluble organic matter (IOM) was examined using stepwise chemical degradation involving base and acid hydrolysis. Iso- and anteiso-C15 and C17 fatty acids (FAs), hopanoic acid and bishomohopanol, and branched glycerol dialkyl glycerol tetraethers (GDGTs) - diagnostic for Bacteria - were targeted as well as archaeol and isoprenoidal GDGTs - diagnostic for Archaea. High percentages of these compounds - up to 65\% - occur in IOM pools, indicating that archaeal- and bacterially derived OM is prone to insolubilization even in shallow sediments (",

keywords = "Archaeol, Branched fatty acids, Early diagenesis, GDGTs, Selective chemical degradation",

author = "\{Chaves Torres\}, Lidia and Pancost, \{Richard D.\}",

year = "2016",

month = mar,

day = "1",

doi = "10.1016/j.orggeochem.2015.12.013",

language = "English",

volume = "93",

pages = "77--91",

journal = "Organic Geochemistry",

issn = "0146-6380",

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TY - JOUR

T1 - Insoluble prokaryotic membrane lipids in a Sphagnum peat

T2 - Implications for organic matter preservation

AU - Chaves Torres, Lidia

AU - Pancost, Richard D.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - Preservation of organic matter (OM) in the geosphere has a direct impact on carbon bioavailability, the carbon cycle and the formation of fossil fuels. We have examined some of the processes that lead to the preservation of OM by characterising insoluble OM in a Sphagnum peat bog. We focussed on the partitioning of prokaryotic biomarkers between solvent-extractable and insoluble OM fractions and how that partitioning changed with depth. The insoluble organic matter (IOM) was examined using stepwise chemical degradation involving base and acid hydrolysis. Iso- and anteiso-C15 and C17 fatty acids (FAs), hopanoic acid and bishomohopanol, and branched glycerol dialkyl glycerol tetraethers (GDGTs) - diagnostic for Bacteria - were targeted as well as archaeol and isoprenoidal GDGTs - diagnostic for Archaea. High percentages of these compounds - up to 65% - occur in IOM pools, indicating that archaeal- and bacterially derived OM is prone to insolubilization even in shallow sediments (

AB - Preservation of organic matter (OM) in the geosphere has a direct impact on carbon bioavailability, the carbon cycle and the formation of fossil fuels. We have examined some of the processes that lead to the preservation of OM by characterising insoluble OM in a Sphagnum peat bog. We focussed on the partitioning of prokaryotic biomarkers between solvent-extractable and insoluble OM fractions and how that partitioning changed with depth. The insoluble organic matter (IOM) was examined using stepwise chemical degradation involving base and acid hydrolysis. Iso- and anteiso-C15 and C17 fatty acids (FAs), hopanoic acid and bishomohopanol, and branched glycerol dialkyl glycerol tetraethers (GDGTs) - diagnostic for Bacteria - were targeted as well as archaeol and isoprenoidal GDGTs - diagnostic for Archaea. High percentages of these compounds - up to 65% - occur in IOM pools, indicating that archaeal- and bacterially derived OM is prone to insolubilization even in shallow sediments (

KW - Archaeol

KW - Branched fatty acids

KW - Early diagenesis

KW - GDGTs

KW - Selective chemical degradation

UR - https://www.scopus.com/pages/publications/84956713187

U2 - 10.1016/j.orggeochem.2015.12.013

DO - 10.1016/j.orggeochem.2015.12.013

M3 - Article (Academic Journal)

AN - SCOPUS:84956713187

SN - 0146-6380

VL - 93

SP - 77

EP - 91

JO - Organic Geochemistry

JF - Organic Geochemistry

ER -

Insoluble prokaryotic membrane lipids in a Sphagnum peat: Implications for organic matter preservation

Abstract

Keywords

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