首页|Spatiotemporal Distribution of Microbial Tetraether Lipids in a Lake and Its Inflowing River:Implications for theIdentification of Flooding Events
Spatiotemporal Distribution of Microbial Tetraether Lipids in a Lake and Its Inflowing River:Implications for theIdentification of Flooding Events
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Microbial glycerol dialkyl glycerol tetraethers (GDGTs) in lacustrine sediments are wide-ly used to reconstruct terrestrial paleoenvironments. However, lipids of diverse origin in lakes make it difficult to decipher environmental information, appealing for the necessity to evaluate the impact of terrigenous input on the distribution of GDGTs through long-term monitoring. In this study, we con-ducted two-year monitoring of GDGTs along the river, estuary, near shore, to the center of Lake Liang-zi in central China. By comparing the spatiotemporal changes of GDGT distribution in suspended par-ticulate matter (SPM) and surface sediments, we found that the archaeal isoprenoid GDGTs (isoG-DGTs) were mainly produced in situ in the river-lake systems, and not affected by the soil input. In con-trast, the bacterial branched GDGTs (brGDGTs) were affected, to some extent, by soil input, depend-ing on the distance to the lakeshore. The soil input of brGDGTs was enhanced during an episode of ab-normal rainfall (flood). Moreover, the large variation of isoGDGTs indicates the in situ production un-der the anoxic condition in lake water. The paired increase in the GDGT-0/Cren ratio and GDGT con-centration might be diagnostic of flooding events in ancient times.
NETL
NSTL
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