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Bacterial Gmgts in East African Lakes: Sources and their Potential as Paleotemperature Indicators

Glycerol monoalkyl glycerol tetraethers (GMGTs) are a group of membrane spanning lipids produced by species of archaea and bacteria which are found in a variety of natural settings. They are structurally similar to the better studied glycerol dialkyl glycerol tetraethers (GDGTs) but differ by having a covalent carbon-carbon bond that forms a bridge between the two alkyl chains. Recent research involving marine sediments (Sollich et al., 2017) and peat (Naafs et al., 2018) suggests that this feature is an adaptation to high temperatures. Presently, there is very little evidence of which organisms produce GMGTs, especially in moderate-temperature environments such as lakes and oceans.