Depth related variation of isoprenoid and hydroxylated tetraether lipids in Lake Lugu, Southwest China: Implications for palaeoenvironmental reconstructions

Archaeal Hydroxylated Isoprenoid GDGTs in Asian Lake Sediments: A New Tool for Terrestrial Paleotemperature Reconstructions

“…Yujiasan and Erxianyuan peatland were 16.7 ± 3.6°C and 12.3 ± 1.8°C, respectively, consistent with actual MAAT (17°C and 14°C, respectively; Man et al, 2023). This indicates the similar temperature adaptation Kou et al, 2022;Sinninghe Damsté, Weber, et al, 2022;Li et al, 2023;Zheng et al, 2023), against sea surface temperatures (SST) in marine surface sediments (Fietz et al, 2013(Fietz et al, , 2016Harning et al, 2023;Huguet et al, 2013;Kaiser & Arz, 2016;Lamping et al, 2021;Lü et al, 2015;Varma et al, 2024;Wei et al, 2020;Y. Yang et al, 2018), and against MAAT in peat and soils (Man et al, 2023;.…”

“…OH-GDGTs were detected in 56 out of 65 lakes in West China (8 ± 22 ng/g dw; Figure 2b) and were not found in catchment soils (Kou et al, 2022;Li et al, 2023;Wu et al, 2021), indicating that OH-GDGTs were produced by autochthonous archaea within the lakes. This is consistent with other lakes across the globe (Sinninghe Damsté, Weber, et al, 2022;.…”

“…The redundancy analysis demonstrates the influence of MAAT on the TEX 86 , RI-OH, and RI-OH′ paleothermometers and the impact of water depth on %OH-GDGTs (Figure 2d). We combined our data and other published lacustrine data to test the applicability of these paleothermometers in lacustrine settings (Figure 1; Kou et al, 2022;Li et al, 2023;Sinninghe Damsté, Weber, et al, 2022;Zheng et al, 2023). The OH-GDGT data are mainly from Asian lakes, and thus the data set was named Asian lake data set for clarity.…”

“…The lake surface sediments in this study exhibit a higher fractional abundance of GDGT-0 and a higher value of Cren/Cren′ compared to the corresponding regional soils (Figure 2a; 0.63 ± 0.22 vs. 0.37 ± 0.20 and 49 ± 39 vs. 7 ± 14, respectively). (Kou et al, 2022;Li et al, 2023;Sinninghe Damsté, Weber, et al, 2022;Zheng et al, 2023), marine surface sediments (Fietz et al, 2013(Fietz et al, , 2016Harning et al, 2023;Huguet et al, 2013;Kaiser & Arz, 2016;Lamping et al, 2021;Lü et al, 2015;Varma et al, 2024;Wei et al, 2020;Y. Yang et al, 2018), soils and peat sediments (Man et al, 2023;.…”

“…In terms of the statistical result, we, therefore, used the Asian lake data set to establish the first RI-OH-temperature calibration for lacustrine settings. The equation is as follows: Wang et al, 2019;Kou et al, 2022;Sinninghe Damsté, Weber, et al, 2022;Li et al, 2023;Zheng et al, 2023). One point with only GDGT-0 detected in panel (a) is excluded, which prevents the calculation of TEX 86 .…”