Dinosterol δD values in stratified tropical lakes (Cameroon) are affected by eutrophication

Schwab, Valérie F.; Garcin, Yannick; Sachse, Dirk; Todou, Gilbert; Séné, Olivier; Onana, Jean-Michel; Achoundong, Gaston; Gleixner, Gerd

doi:10.1016/j.orggeochem.2015.08.003

Cited by 11 publications

(12 citation statements)

References 102 publications

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“…which has been attributed to preferential degradation of the lighter isotopologues of 744! these compounds (Schwab et al, 2015). Likewise, n-alkanes that showed evidence of 745!…”

Section: !mentioning

confidence: 95%

“…of heterotrophic microbes. For example, Schwab et al (2015) demonstrated that δ 2 H 135! values of dinosterol (4α,23,24-trimethyl-5α-cholest-22E-en3-ol) accumulating in 136!…”

Section: !mentioning

confidence: 99%

“…sterols by anaerobic bacteria preferentially reduces molecules that are depleted in 2 H 142! (Schwab et al, 2015).…”

Section: !mentioning

confidence: 99%

“…explanation for the 2 H-enrichment of dinosterol in the sediments of more eutrophic 152! lakes in Cameroon (Schwab et al, 2015).…”

Section: !mentioning

confidence: 99%

“…collected in estuaries and lakes have been observed to be 2 H-enriched relative to those 742! in overlying suspended particles (Sachs and Schwab, 2011;Schwab et al, 2015), 743! which has been attributed to preferential degradation of the lighter isotopologues of 744!…”

Section: !mentioning

confidence: 99%

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Lipid compound classes display diverging hydrogen isotope responses in lakes along a nutrient gradient

Ladd

Nelson

Schubert

et al. 2018

Geochimica et Cosmochimica Acta

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Compound specific hydrogen isotope ratios (2 H/ 1 H) of lipid biomarkers 36! preserved in sediments are used as a paleohydrologic proxies. However, several 37! variables, including contributions from different source organisms and their growth 38! rates, can influence 2 H/ 1 H fractionation between lipids and source water. Significant 39! uncertainties remain about how these factors combine to produce the net 2 H/ 1 H signal 40! exported to sediments. 41! To assess the influence of phosphorus availability on 2 H/ 1 H ratios of lipids 42! accumulating in lake sediments, we analyzed surface sediments and sediment traps 43! from ten central Swiss lakes, representing a wide range of trophic states. In agreement 44! with results from laboratory cultures, 2 H/ 1 H fractionation for the diatom biomarker 45! brassicasterol (24-methyl cholest-5,22-dien-3β-ol) increased in more productive lakes 46! (0.6 ± 0.1 ‰ per µg/L total P in sediment traps and surface sediments). In contrast, 47! 2 H/ 1 H fractionation for phytol, the isoprenoid side-chain moiety of chlorophyll, 48! decreased with increasing total P (-0.4 ± 0.1 ‰ per µg/L total P in sediment traps), 49! suggesting that different biochemical mechanisms are responsible for changes in 2 H/ 1 H 50! fractionation for each class of isoprenoidal lipids. Opposing changes in 2 H-51! fractionation for sterols and phytol cause their 2 H/ 1 H ratios to converge as total P 52! increases. This response may be a new tracer for phytoplankton growth conditions and 53! is not influenced by the source water isotope value. 54! Interpreting the 2 H/ 1 H ratios of short to long chain (C 14-C 30) n-alkanoic acids 55! and n-alkanols is complicated by likely contributions from heterotrophs and/or 56! vascular plants. These values generally did not correlate with lake water isotopes, nor 57! did their fractionation factors correlate with total P. For most lipids there was no 58! significant difference between sediment trap and surface sediment 2 H/ 1 H ratios. 59! However, n-C 14n-C 18 fatty acids were 2 H-enriched in the surface sediments, most 60! likely due to degradation in the water column. Our results indicate that interpretations 61! of short-chain fatty acids as a water isotope signal likely require supporting 62! information about ecological conditions and community structure, but that paired H 63! isotope measurements of phytoplankton-derived sterols and phytol may be developed 64! as a proxy for phytoplankton growth.

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“…which has been attributed to preferential degradation of the lighter isotopologues of 744! these compounds (Schwab et al, 2015). Likewise, n-alkanes that showed evidence of 745!…”

Section: !mentioning

confidence: 95%

“…of heterotrophic microbes. For example, Schwab et al (2015) demonstrated that δ 2 H 135! values of dinosterol (4α,23,24-trimethyl-5α-cholest-22E-en3-ol) accumulating in 136!…”

Section: !mentioning

confidence: 99%

“…sterols by anaerobic bacteria preferentially reduces molecules that are depleted in 2 H 142! (Schwab et al, 2015).…”

Section: !mentioning

confidence: 99%

“…explanation for the 2 H-enrichment of dinosterol in the sediments of more eutrophic 152! lakes in Cameroon (Schwab et al, 2015).…”

Section: !mentioning

confidence: 99%

Section: !mentioning

confidence: 99%

See 3 more Smart Citations

Lipid compound classes display diverging hydrogen isotope responses in lakes along a nutrient gradient

Ladd

Nelson

Schubert

et al. 2018

Geochimica et Cosmochimica Acta

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Historical changes in the phytoplankton community in Fuxian and Dianchi lakes recorded based on alkyl diols and sterol biomarkers

Ran

Wan

Zhang

et al. 2022

Preprint

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Historical changes of phytoplankton community in Fuxian and Dianchi lakes recorded by alkyl diols and sterol biomarkers

Wan

Zhuo

Qiao

et al. 2022

Preprint

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We investigated historical changes in temperature and phytoplankton in Fuxian Lake (FX) and Dianchi Lake (DC), two plateau lakes in Southwest China. We detected sterols and alkyl diols as algal biomarkers (Dinoflagellates, Diatoms, Eustigmatophytes, Cyanobacteria, and Chlorophyta) in the sediment cores by using GC-MS. We characterized sedimentary organic matter (SOM) via C-13 isotope and C/N ratio, and Rock-Eval analysis to obtain total organic carbon (TOC), S2, the hydrogen index (HI), refractory carbon (RC), and nutrient status such as total phosphorus (TP) and total nitrogen (TN) in the sediment cores. The results showed that the sedimentation rates measured by 210 Pb dating ranged from 0.02 to 0.30 g cm -2 yr -1 and 0.07 g cm -2 yr -1 in FX and DC, respectively. The Bayesian isotope mixing model indicated that organic matter from plankton was the main contributor of organic matter in FX and DC and, its contents was gradually increasing . Primary productivity derived from the S2 and HI parameters showed an increasing trend in FX and DC. Cyanobacteria and Chlorophyta were the two dominant phyla in the two lakes. Algal growth was controlled primarily by temperature and nutrient availability. Principal component analysis (PCA) and multiple linear regression analysis showed that the major factors controlling the historical change in phytoplankton growth were TN and temperature in FX and DC. Historical changes in the phytoplankton community in Fuxian andDianchi lakes recorded based on alkyl diols and sterol biomarkers

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Dinosterol δD values in stratified tropical lakes (Cameroon) are affected by eutrophication

Cited by 11 publications

References 102 publications

Lipid compound classes display diverging hydrogen isotope responses in lakes along a nutrient gradient

Lipid compound classes display diverging hydrogen isotope responses in lakes along a nutrient gradient

Historical changes in the phytoplankton community in Fuxian and Dianchi lakes recorded based on alkyl diols and sterol biomarkers

Historical changes of phytoplankton community in Fuxian and Dianchi lakes recorded by alkyl diols and sterol biomarkers

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