A comparative study of lipids in Sphagnum species

Baas, Marianne; Pancost, Richard D.; Geel, B. van; Damsté, Jaap S Sinninghe

doi:10.1016/s0146-6380(00)00037-1

Cited by 241 publications

(156 citation statements)

References 14 publications

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“…Mosses exhibited a greater predominance of higher molecular weight n-alkanes, mainly C 31 (3 samples) and C 29 (Table 2), with the exception of the species of Sphagnum, which maximized at C 23 , coinciding with the results of previous studies (Baas et al, 2000;Nott et al, 2000;Pancost et al, 2002;Nichols et al, 2006;Ortiz et al, 2011;Bush and Mclnerney, 2013). These findings thus show that the predominant n-alkane in most of Sphagnum moss species is C 23 , while in other plants long chain n-alkanes are the most abundant.…”

Section: Lípid Biomarkers In Living Plantssupporting

confidence: 86%

“…HMW n-alkan-2-ones between C 23 and C 31 are present in all species of Sphagnum, maximizing at C 27 (Morrison and Bick, 1967;Baas et al, 2000;Nichols and Huang, 2007;Ortiz et al, 2011). Although these compounds have been cited only in Sphagnum moss, here (Table 3) and previously (Ortiz et al, 2011), we observed other peat forming plants with n-alkan-2-ones peaking at C 25 • C 27 , C 29 and C 31 .…”

Section: N-alkan-2-onessupporting

confidence: 61%

“…AIso, in some Sphagnum species (e.g. S. capíllífolíum, S. magellanícum, S. cuspídatum), there was a bimodal distribution, with a second maximum at C 31 (Baas et al, 2000;Nott et al, 2000;Pancost et al, 2002). Given that the n-alkane profiles of Sphagnum (maximizing at C 23 ) and other plants (predominance of C 31 ) differ, the predominant n-alkane chain distribution in Las Conchas record (Fig.…”

Section: Paleoenvíronmental Reconstructíonmentioning

confidence: 98%

“…5G). Given that C 24 or C 26 predominates in Sphagnum species (Baas et al, 2000;Pancost et al, 2002) and that the C 24 alkanoic acid is also the most abundant homolog in other plants (Table 4), such as heather, rush, sedge and other mosses (Pancost et al, 2002;Ortiz et al, 2011), we cannot draw any conclusion about the origin of these compounds on the basis of the predominant n-alkanoic acid chain log.…”

Section: N-alkanoíc Addsmentioning

confidence: 98%

“…Given that the ratio compares the abundance of medium chain n-alkanes with the sum of the abundance of medium and long chain n-alkanes and that Sphagnum species have n-alkane profiles similar to those of aquatic macrophytes (cf. Ficken et al, 2000;Baas et al, 2000;Nott et al, 2000;Pancost et al, 2002;Nichols et al, 200G), Nichols et al (200G) proposed its use for the determination of the relative abundance of Sphagnum vs. other bog-forming plants. Nichols et al (200G) used the C 23 /C 29 n-alkane ratio to discriminate between major Sphagnum input vs. other plant inputs, as C 29 is relatively scarce in Sphagnum but abundant in other species.…”

Section: Paleoenvíronmental Reconstructíonmentioning

confidence: 99%

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Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Ortíz

Borrego

Gallego

et al. 2016

Organic Geochemistry

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A B S T R A C TWe determined the lipid distributions (n-alkanes, n-alkan-2-ones, n-alkanoic acids), total organic carbon (TOC), total nitrogen (TN), CajMg and ash content in Las Conchas mire, a 3.2 m deep bryophytedominated mire in Northern Spain covering 8000 cal yr BP. Bog conditions developed in the bottom 20 cm of the profile, and good preservation of organic matter (OM) was inferred from n-alkanoic acid distribution, with the exception of the uppermost 20 cm (last ca. 200 yr). Microbial synthesis of long chain saturated fatty acids from primary OM likely produced a dominance of short chain n-alkanoic acids with a bimodal distribution, as well as the lack of correspondence between the n-alkane and n-alkanoic acid profiles in the upper 20 cm. This was accompanied by an increase in ash content, a decrease in TOC and variation in n-alkane ratio s, thereby suggesting significant changes in the mire, namely drainage and transformation to a meadow, in the last ca. 200 yr. The distribution of n-alkan-2-ones indicated an increase in bacterial source from the bottom of the record to 94 cm, whereas their distribution in the upper part could be attributed mainly to plant input andjor the microbial oxidation of n-alkanes. The different n-alkane proxies showed variations, which we interpreted in terms of changes in vegetation (Sphagnum vs. non-Sphagnum dominated phases) during the last 8000 cal yr BP. C 23 was the most abundant homolog throughout most ofthe record, thereby suggesting dominant humid conditions alternating with short drier phases. However, such humid conditions were not linked to paleoclimatic variation but rather to geomorphological characteristics: Las Conchas mire, at the base of the Cuera Range, receives continuous runoff-even during drier periods-which is not necessarily accompanied by additional mineral input to peat, producing the development of Sphagnum moss typical of waterlogged ecotopes and damp habitats. Thus, although geochemical proxies indicated an ombrotrophic regime in the mire, geomorphological characteristics may make a considerable contribution to environmental conditions.

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Section: Lípid Biomarkers In Living Plantssupporting

confidence: 86%

Section: N-alkan-2-onessupporting

confidence: 61%

Section: Paleoenvíronmental Reconstructíonmentioning

confidence: 98%

Section: N-alkanoíc Addsmentioning

confidence: 98%

Section: Paleoenvíronmental Reconstructíonmentioning

confidence: 99%

See 3 more Smart Citations

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Ortíz

Borrego

Gallego

et al. 2016

Organic Geochemistry

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Biochemical evidence for minimal vegetation change in peatlands of the West Siberian Lowland during the Medieval Climate Anomaly and Little Ice Age

2014

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Peatland vegetation is controlled primarily by the depth of the water table, making peat paleovegetation a useful climate archive. We applied a biochemical approach to quantitatively estimate the plant sources of peat carbon based on (1) neutral sugar compositions of Sphagnum, vascular plants, and lichens and (2) lignin phenol compositions of vascular plants. We used these biochemical indices to characterize vegetation change over the last 2000 years in four peat cores from the West Siberian Lowland (Russia) to investigate climate change during the Medieval Climate Anomaly and Little Ice Age. The vegetation was dominated by Sphagnum in all four cores, but was punctuated by several rapid but transient transitions to vascular plant dominance in the two cores from the southern West Siberian Lowland (<60°N latitude). Lichen contributions were evident at the end of the Medieval Climate Anomaly and during the Little Ice Age in the two cores from northern West Siberian Lowland (>60°N), possibly indicating permafrost development. However, there was no evidence for sustained vegetation change in response to either climatic event in cores from southern West Siberian Lowland. This suggests that these climatic events were relatively mild in the southern West Siberian Lowland, although the sensitivity of bog plant communities to climate change remains poorly understood.

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A novel framework for quantifying past methane recycling by Sphagnum‐methanotroph symbiosis using carbon and hydrogen isotope ratios of leaf wax biomarkers

Nichols

Isles

Peteet

2014

Geochem Geophys Geosyst

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The concentration of atmospheric methane is strongly linked to variations in Earth's climate.Currently, we can directly reconstruct the total atmospheric concentration of methane, but not individual terms of the methane cycle. Northern wetlands, dominated by Sphagnum, are an important contributor of atmospheric methane, and we seek to understand the methane cycle in these systems. We present a novel method for quantifying the proportion of carbon Sphagnum assimilates from its methanotrophic symbionts using stable isotope ratios of leaf-wax biomarkers. Carbon isotope ratios of Sphagnum compounds are determined by two competing influences, water content and the isotope ratio of source carbon. We disentangled these effects using a combined hydrogen and carbon isotope approach. We constrained Sphagnum water content using the contrast between the hydrogen isotope ratios of Sphagnum and vascular plant biomarkers. We then used Sphagnum water content to calculate the carbon isotope ratio of Sphagnum's carbon pool. Using a mass balance equation, we calculated the proportion of recycled methane contributed to the Sphagnum carbon pool, ''PRM.'' We quantified PRM in peat monoliths from three microhabitats in the Mer Bleue peatland complex. Modern studies have shown that water table depth and vegetation have strong influences on the peatland methane cycle on instrumental time scales. With this new approach, d 13 C of Sphagnum compounds are now a useful tool for investigating the relationships among hydrology, vegetation, and methanotrophy in Sphagnum peatlands over the time scales of entire peatland sediment records, vital to our understanding of the global carbon cycle through the Late Glacial and Holocene.

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A comparative study of lipids in Sphagnum species

Cited by 241 publications

References 14 publications

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Biochemical evidence for minimal vegetation change in peatlands of the West Siberian Lowland during the Medieval Climate Anomaly and Little Ice Age

A novel framework for quantifying past methane recycling by Sphagnum‐methanotroph symbiosis using carbon and hydrogen isotope ratios of leaf wax biomarkers

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