Distributions and sources of isoprenoidal GDGTs in Lake Lugano and other central European (peri-)alpine lakes: Lessons for their use as paleotemperature proxies

Damsté, Jaap S. Sinninghe; Weber, Yuki; Zopfi, Jakob; Lehmann, Moritz F.; Niemann, Helge

doi:10.1016/j.quascirev.2021.107352

Cited by 23 publications

(27 citation statements)

References 106 publications

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“…Therefore, a more likely explanation for the apparently high values of the RI-OH index is that they are caused by the freshwater conditions and not by high SSTs during the Ancylus Lake phase. This is fully consistent with recent observations in Lake Lugano in Switzerland (Sinninghe Damsté et al, 2022). Lipid analysis of the SPM obtained from various water depths of this stratified and partially anoxic, deep (288 m) lake showed that crenarchaeol and OH-isoGDGTs with zero to two cyclopentane rings show the same concentration profile, peaking in the deeper (30-100 m) oxic waters well below the thermocline but above the oxycline at ca.…”

Section: Application Of Oh-gdgt-derived Sst Proxies To the Baltic Sea...supporting

confidence: 91%

“…The filters of the cultures were extracted with a modified Bligh and Dyer extraction and the extracts were acidhydrolyzed to release core GDGTs as previously described (Pitcher et al, 2011). This approach is required to release core GDGTs but unfortunately results in the (partial) removal of the hydroxy group of the OH-GDGT (Sinninghe Damsté et al, 2022), which may alter their distribution. To check this, we also analyzed the distribution of OH-GDGTs in intact polar lipids (IPLs) by analyzing them directly with an Agilent 1200 series liquid chromatograph coupled to a Thermo LTQ XL linear ion trap with an Ion Max source with an electrospray ionization (ESI) probe (for details, see Sinninghe .…”

Section: Lipid Extraction and Gdgt Analysismentioning

confidence: 99%

“…It is thought that the relative abun-dance of OH-GDGTs increases with decreasing temperature (Huguet et al, 2013), so this discrepancy is hard to explain, especially since the average temperature of the Baltic Sea is higher than the temperature (i.e., 4 • C) at which the enrichment culture was grown. This discrepancy likely stems from the experimental method used to analyze the OH-GDGTs in the enrichment culture (i.e., by acid hydrolysis, which leads to partial loss of the hydroxy group of OH-GDGTs; see Sinninghe Damsté et al, 2022). Indeed, direct analysis of IPL GDGTs in the Bligh-Dyer extract resulted in much higher estimates of OH-GDGT% (ca.…”

Section: Biological Sources Of Oh-gdgts In the Baltic Seamentioning

confidence: 99%

“…Lü et al (2019) noted lower concentrations of OH-GDGTs in suspended particulate matter (SPM) of the Yangtze River estuary in winter than in summer and in the lower reaches of the river than in the estuary, suggesting a predominant source by in situ production of marine Thaumarchaeota in summer. However, in the stratified, anoxic Lake Lugano a single thaumarchaeote thriving in the suboxic waters below the thermocline (30-70 m) also produced OH-GDGTs that were transported to the lake floor as revealed by sediment trap studies (Sinninghe Damsté et al, 2022), indicating that OH-GDGTs may also be formed in freshwater environments.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the distributions of hydroxylated glycerol dibiphytanyl glycerol tetraethers (GDGTs) in Holocene Baltic Sea sediments for reconstruction of sea surface temperature: the effect of changing salinity

et al. 2022

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Abstract. Hydroxylated glycerol dibiphytanyl glycerol tetraethers (OH-GDGTs) produced by both marine and freshwater thaumarchaea are increasingly used for the reconstruction of past sea surface temperature (SST). They occur throughout the modern Baltic Sea, but it is unknown if OH-GDGTs can be used for assessing past SST in this area, where salinity has changed considerably over the Holocene. Three commonly applied OH-GDGT proxies for SST reconstruction, i.e., the OH-GDGT%, RI-OH, and RI-OH′ indices, were tested using a thaumarchaeotal culture enriched from the Baltic Sea grown at 4 and 22 ∘C, as well as 12 surface sediments from the Baltic Sea and the adjacent Skagerrak. In the culture experiments all three proxies showed the expected response with the rise in temperature, but their absolute values were not always in line with existing marine core-top calibrations, especially for the OH-GDGT% index. Of the two proxies based on the distribution of OH-GDGTs, the RI-OH index shows no increase with increasing mean annual SST, whilst the RI-OH′ index shows only a linear correlation with SST when the sediments from the Bothnian Sea and Bothnian Bay area, with a reduced salinity and increased lateral sediment influx, are omitted from the dataset. Two sedimentary Holocene records from the Arkona and Gotland basins were studied, the latter in high resolution. In the brackish phase of the Baltic Sea (the Littorina Sea stage), the RI-OH′ index shows a good correlation with the TEX86L, an established temperature proxy in the Baltic Sea, and can be used to identify important climatic events. However, during the preceding Ancylus Lake phase the RI-OH′ (and RI-OH) index records values that are far too high, resulting in anomalously high SST estimates. This is probably because freshwater thaumarchaea adjust their OH-GDGTs differently, as has been shown for thaumarchaea in Lake Lugano's water column. In the Littorina Sea, Ancylus Lake, and Yoldia Lake phases of the Baltic basin, the record of the RI-OH′ index thus most likely reflects changes in both temperature and salinity. Overall, our study indicates that a reduced salinity increases the values of the RI-OH′ (and RI-OH) indices substantially, and this should be considered when applying these proxies in other settings.

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Section: Application Of Oh-gdgt-derived Sst Proxies To the Baltic Sea...supporting

confidence: 91%

Section: Lipid Extraction and Gdgt Analysismentioning

confidence: 99%

Section: Biological Sources Of Oh-gdgts In the Baltic Seamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the distributions of hydroxylated glycerol dibiphytanyl glycerol tetraethers (GDGTs) in Holocene Baltic Sea sediments for reconstruction of sea surface temperature: the effect of changing salinity

et al. 2022

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“…Tandem work on modern lake core-tops over a range of temperature regimes may provide an indication of the magnitude of any temperature effects, though it remains unknown whether this archaeal 2 eL/W offset is temperature sensitive (see section 5.1.2). Once calibrated, the reconstructed lake water record could be compared to estimated regional meteoric water δ 2 H values obtained from co-deposited n-alkanes that reflect water available to the surrounding vegetation during the period of leaf synthesis (Tipple et al, 2013), potentially yielding insights to past changes in the hydrologic cycle or plant physiological effects that can be missing from the plant perspective (Sachse et al, 2012), and may help unpack diverse GDGT sources in some lacustrine systems when paired with C-isotopes (Sinninghe Damsté et al, 2022). In the marine environment, variation in the δ 2 H value of ocean water is minimal, and a modern core-top calibration would serve to uniquely calibrate temperature signals independently from variations in source water.…”

Section: Calibrating Biphytane 2 E L/w Offsets For Paleohydrology And...mentioning

confidence: 99%

Archaeal lipid hydrogen isotopes in a marine thaumarchaeon

Leavitt

Kopf

Weber

et al. 2022

Preprint

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The stable hydrogen isotope composition of persistent biomolecules is used as a paleoenvironmental proxy. While much previous work has focused on plant leaf wax-derived n-alkanes, the potential of bacterial and archaeal lipid biomarkers as carriers of H isotope signatures remains underexplored. Here we investigated H isotope distributions in the membrane lipids of the ammonia-oxidizing chemoautotroph Nitrosopumilus maritimus strain SCM1. Hydrogen isotope ratios were measured on the biphytane chains of tetraether membrane lipids extracted from steady-state continuous cultures cultivated at slow, medium, and fast growth rates. In contrast to recent work on bacterial fatty acids, where the direction and magnitude of isotopic fractionation varies widely (ca. 600 energy metabolism, archaeal biphytane data in the present work are relatively invariant. The weighted average 2H/1H fractionation values relative to growth water (2εL/W) only ranged from 272 to 260 a three-fold difference in doubling times (30.8 hr to 92.5 hr), yielding an average growth-rate effect of 0.2 depleted than all heterotrophic archaeal and bacterial lipid H isotope measurements in the literature, and on par with those from other autotrophic archaea, as well as isoproenoid-based lipids in photoautotrophic algae. N. maritimus values of 2εL/W also varied systematically with the number of internal rings (cyclopentyl + cyclohexyl), increasing for each additional ring by 6.4 ± 2.7 an isotope flux-balance model in tandem with a comprehensive analysis of the sources of H in archaeal lipid biosynthesis, we use this observation to estimate the kinetic isotope effects (KIEs) of H incorporation from water; from reducing cofactors such as ferredoxin, and for the transhydrogenation reaction(s) that convert the electron-donor derived NADH into NADPH for anabolic reactions. Consistent with prior studies on bacteria, our results indicate the KIEs of reducing cofactors and transhydrogenation processes in archaea are highly fractionating, while those involving exchange of water protons are less so. When combined with the observation of minimal growth-rate sensitivity, our results suggest biphytanes of autotrophic 3HP/4HB Thaumarchaeota may be offset from source waters by a nearly constant 2εL/W value. Together with the ring effect, this implies that all biphytanes originating from a common source should have a predictable ordering of their isotope ratios with respect to biphytane ring number, allowing precise reconstruction of the original δ2H value of the growth water. Collectively, these patterns indicate archaeal biphytanes have potential as paleo-hydrological proxies, either as a complement or an alternative to leaf wax n-alkanes.

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Biomarker proxies for reconstructing Quaternary climate and environmental change

McClymont,

Mackay,

Stevenson

et al. 2023

J Quaternary Science

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To reconstruct past environmental changes, a range of indirect or proxy approaches can be applied to Quaternary archives. Here, we review the complementary and novel insights that have been provided by the analysis of chemical fossils (biomarkers). Biomarkers have a biological source that can be highly specific (e.g. produced by a small group of organisms) or more general. We show that biomarkers are able to quantify key climate variables (particularly water and air temperature) and can provide qualitative evidence for changes in hydrology, vegetation, human–environment interactions and biogeochemical cycling. In many settings, biomarker proxies provide the opportunity to simultaneously reconstruct multiple climate or environmental variables, alongside complementary and long‐established approaches to palaeoenvironmental reconstruction. Multi‐proxy studies have provided rich sets of data to explore both the drivers and impacts of palaeoenvironmental change. As new biomarker proxies continue to be developed and refined, there is further potential to answer emerging questions for Quaternary science and environmental change.

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Distributions and sources of isoprenoidal GDGTs in Lake Lugano and other central European (peri-)alpine lakes: Lessons for their use as paleotemperature proxies

Cited by 23 publications

References 106 publications

Evaluation of the distributions of hydroxylated glycerol dibiphytanyl glycerol tetraethers (GDGTs) in Holocene Baltic Sea sediments for reconstruction of sea surface temperature: the effect of changing salinity

Evaluation of the distributions of hydroxylated glycerol dibiphytanyl glycerol tetraethers (GDGTs) in Holocene Baltic Sea sediments for reconstruction of sea surface temperature: the effect of changing salinity

Archaeal lipid hydrogen isotopes in a marine thaumarchaeon

Biomarker proxies for reconstructing Quaternary climate and environmental change

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