Environmental controls on branched tetraether lipid distributions in tropical East African lake sediments

Tierney, Jessica E.; Russell, James M.; Eggermont, Hilde; Hopmans, Ellen C.; Verschuren, Dirk; Damsté, J.S. Sinninghe

doi:10.1016/j.gca.2010.06.002

Cited by 292 publications

(373 citation statements)

References 48 publications

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“…Huguet et al, 2010b;Weijers et al, 2011a) and lakes (e.g. Tierney et al, 2010;Pearson et al, 2011). The modifications in branched GDGT distribution induced by the OTC treatment in the Frasne peatland were reflected in the MBT index, which was significantly higher in the OTCs at all depths (Table 5).…”

Section: Intensity (Cps) Retention Time (Min)mentioning

confidence: 94%

“…These might belong to the phylum Acidobacteria Sinninghe Damsté et al, 2011). Branched GDGTs occur ubiquitously in soils (Weijers et al, 2007a(Weijers et al, , 2011aHuguet et al, 2010a;Kim et al, 2011) and peats (Liu et al, 2010;Huguet et al, 2010b;Weijers et al, 2011b) as well as in lakes (Tierney and Russell, 2009;Bechtel et al, 2010;Tierney et al, 2010;Zink et al, 2010;Pearson et al, 2011) and coastal marine sediments (Hopmans et al, 2004;Kim et al, 2007). These compounds are the object of a growing interest.…”

Section: Introductionmentioning

confidence: 99%

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Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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To cite this version:Arnaud Huguet, Céline Fosse, Fatima Laggoun-Défarge, Frédéric Delarue, Sylvie Derenne. Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland. Geochimica et Cosmochimica Acta, Elsevier, 2013Elsevier, , 105, pp.294-315. 10.1016Elsevier, /j.gca.2012 Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland AbstractBranched glycerol dialkyl glycerol tetraethers (GDGTs) are complex lipids of high molecular weight, recently discovered in soils and increasingly used as palaeoclimate proxies. Their degree of methylation, expressed in the MBT, was shown to depend on mean annual air temperature (MAAT) and to a lesser extent on soil pH, whereas the relative abundance of cyclopentyl rings of branched GDGTs, expressed in the CBT, was related to soil pH. To date, only a few studies were interested in the application of the MBT and CBT proxies in peatlands. In order to validate the applicability of branched GDGTs as temperature proxies in these environments, it is essential to investigate the effect of temperature on branched GDGT-producing bacteria and especially on the speed of adaptation of these microorganisms to temperature changes. The aim of this work was to study the effects of in situ experimental climate warming on the abundance and distribution of branched GDGTs in a Sphagnum-dominated peatland (Jura Mountains, France). Branched GDGTs either present as core lipids (CLs; presumed of fossil origin) or derived from intact polar lipids (IPLs, markers for living cells) were analysed. Air temperature was experimentally increased using a passive warming system consisting of open mini-greenhouses (open-top chamber -OTC). The effect of the OTCs was especially apparent in spring and summer, with (i) an increase in maximal air temperature of ca. 3°C during these two seasons and (ii) an increase in average air temperature of ca. 1°C in summer. Despite the short duration of the climate experiment (26 months), branched GDGT distribution was significantly affected by this temperature rise, with higher MBT values in the OTCs than in the control plots, supporting the empirical relationship between MBT and MAAT established from a large range of soils. The difference in branched GDGT-derived temperatures between control and OTC plots (2-3°C) was in the same range as the increase in maximal (daytime) temperature induced by the OTCs in spring and summer, suggesting that branched GDGT-producing bacteria might be more active during the warmest months of the year. The OTC treatment had no significant effect on the abundance of branched GDGTs, which were mainly present as "fossil" CLs (70-85% of the total branched GDGT pool). Furthermore, no significant differences in branched GDGT distribution were observed between the CLs and IPLs, which both provided higher MBT and MAAT values for the OTCs. This suggests that the fossil pool of branched GDGTs has a very fast turnove...

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Section: Intensity (Cps) Retention Time (Min)mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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“…As lake studies have shown that weighted branched GDGT calibration might be more suitable than the MBT/CBT, we tested the equations of Tierney et al (2010), and Pearson et al (2011) on our data set. Both these calibrations give a much poorer correlation in stalagmites than the MBT/CBT calibration, with r 2 values of 0.32 and 0.45 respectively against surface temperature (data not shown).…”

Section: Mbt/cbt Proxymentioning

confidence: 99%

“…The use of the MBT/CBT soil derived proxy in lakes has proved problematic, with calculated temperatures consistently coming out colder than measured temperatures (Tierney et al, 2010;Blaga et al, 2010;Pearson et al, 2011). This is hypothesised to be the result of mixed environmental inputs, with branched GDGTs being derived from both transported terrestrial material and in situ production (Tierney and Russell, 2009;Tierney et al, 2010;Pearson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…This is hypothesised to be the result of mixed environmental inputs, with branched GDGTs being derived from both transported terrestrial material and in situ production (Tierney and Russell, 2009;Tierney et al, 2010;Pearson et al, 2011). Therefore, recently other statistical techniques have been applied, focusing on regression models and weighted GDGT proxies, which has yielded improved correlations between branched GDGT distribution and lake temperatures (Tierney et al, 2010;Pearson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Calibrating the glycerol dialkyl glycerol tetraether temperature signal in speleothems

Blyth¹,

Schouten²

2013

Geochimica et Cosmochimica Acta

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Palaeotemperature proxies based on glycerol dialkyl glycerol tetraethers (GDGTs) lipids have been established for marine and lacustrine environments, but there has been relatively little study of their application in speleothems. In this study we analyse the GDGT content of 33 speleothem samples from 16 different sites around the globe, and test whether proxies based on isoprenoid tetraethers (TEX 86 ) or branched tetraethers (MBT/CBT) are correlated with measured surface and cave mean annual air temperature (MAT). The results show that the TEX 86 has a strong relationship with measured temperature (r 2 = 0.78, standard error of the estimate 2.3°C, when calibrated with surface MAT). Furthermore, the MBT/CBT also showed a significant relationship with temperature (r 2 = 0.73, standard error of the estimate 2.7°C, when calibrated with surface MAT). Some issues remain requiring future work, in particular the development of a larger calibration sample set with measured cave temperature data, and the investigation of controls other than temperature on GDGT distribution, but overall the results indicate that GDGT based proxies derived from speleothems may be highly viable new methods for reconstructing continental palaeotemperatures.

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Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments: Sources and implications for paleothermometry at high latitudes

Peterse

Vonk

Holmes

et al. 2014

J. Geophys. Res. Biogeosci.

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Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are analyzed in different lakes of the Mackenzie (Canadian Arctic) and Kolyma (Siberian Arctic) River basins to evaluate their sources and the implications for brGDGT-based paleothermometry in high-latitude lakes. The comparison of brGDGT distributions and concentrations in the lakes with those in river suspended particulate matter, riverbank sediments, and permafrost material indicates that brGDGTs in Arctic lake sediments have mixed sources. In contrast to global observations, distributional offsets between brGDGTs in Arctic lakes and elsewhere in the catchment are minor, likely due to the extreme seasonality and short window of biological production at high latitudes. Consequently, both soil-and lake-calibrated brGDGT-based temperature proxies return sensible temperature estimates, even though the mean air temperature (MAT) in the Arctic is below the calibration range. The original soil-calibrated MBT-CBT (methylation of branched tetraethers-cyclisation of branched tetraethers) proxy generates MATs similar to those in the studied river basins, whereas using the recently revised MBT′-CBT calibration overestimates MAT. The application of the two global lake calibrations, generating summer air temperatures (SAT) and MAT, respectively, illustrates the influence of seasonality on the production of brGDGTs in lakes, as the latter overestimates actual MAT, whereas the SAT-based lake calibration accounts for this influence and consequently returns more accurate temperatures. Our results in principle support the application of brGDGT-based temperature proxies in high-latitude lakes in order to obtain long-term paleotemperature records for the Arctic, although the calibration and associated transfer function have to be selected with care.

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Environmental controls on branched tetraether lipid distributions in tropical East African lake sediments

Cited by 292 publications

References 48 publications

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Calibrating the glycerol dialkyl glycerol tetraether temperature signal in speleothems

Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments: Sources and implications for paleothermometry at high latitudes

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