Application of hydroxylated glycerol dialkyl glycerol tetraethers: A review
Li Jingjing1, Yang Huan2, Gao Chao2, Zhao Cheng1
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu;
2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences(Wuhan), Wuhan 430074, Hubei
Hydroxylated GDGTs (OH-GDGTs) are a suite of GDGTs with up to two OH groups in one of their alkyl chains and are widespread in global marine sediments. The biological sources of OH-GDGTs are likely planktonic Thaumarchaeota, especially the cultivated representatives of Group 1.1a in marine environments. The OH-GDGTs were also found in an extremophile Euryarchaeota culture (Methanothermococcus thermolithotrophicus). Previous investigations based on global marine environments indicated that the relative abundance of OH-GDGTs in marine sediments increased with the increasing latitude and showed a significant correlation with sea surface temperature (SST), and the relative number of cyclopentane rings in OH-GDGTs increased with increasing SST in subpolar and polar regions. The occurrence of OH-GDGTs in ancient downcore sediments suggests potential for these compounds for paleoenviromental applications, by using an extended compilation from a global core top OH-GDGTs data set, the OH-GDGTs based proxies could be used as potential indicators of paleo sea surface temperature, especially when the application of other biomarkers is limited.
Although many studies have focused on OH-GDGTs in marine settings, only a few have examined the occurrence of OH-GDGTs in lacustrine environments. Further studies are necessary to explore the distribution pattern of OH-GDGTs in lake settings, the relationship between the distribution pattern of OH-GDGTs and temperature. Also the applicability of marine environments based OH-GDGTs calibrations should be measured in lacustrine environments.
In this paper, we introduce the structures, biological sources and the occurrence of OH-GDGTs in marine and lacustrine environments to further explore the biological and environmental implications of OH-GDGTs in environment samples.
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