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. Soils represent the largest reservoir of organic carbon(OC) on land. Upon mobilization, this OC is either returned to theatmosphere as carbon dioxide ( CO2 ) or transported and ultimatelylocked into (marine) sediments, where it will act as a long-term sink ofatmospheric CO2 . These fluxes of soil OC are, however, difficult toevaluate, mostly due to the lack of a soil-specific tracer. In this study, asuite of branched glycerol dialkyl glycerol tetraethers (brGDGTs), which aremembrane lipids of soil bacteria, is tested as specific tracers for soil OCfrom source (soils under arable land, ley, grassland, and woodland) to sink(Loe Pool sediments) in a small catchment located in southwestEngland (i.e. Carminowe Creek draining into Loe Pool). The analysis ofbrGDGTs in catchment soils reveals that their distribution is notsignificantly different across different land use types ( p>0.05 ) and thus does not allow land-use-specific soil contributionsto Loe Pool sediments to be traced. Furthermore, the significantly highercontribution of 6-methyl brGDGT isomers in creek sediments (isomerizationratio (IR)  = 0.48±0.10 , mean  ±  standard deviation (SD); p ) compared to that in catchment soils (IR  = 0.28±0.11 ) indicates that the initial soil signal is substantially altered bybrGDGT produced in situ. Similarly, the riverine brGDGT signal appears to beoverwritten by lacustrine brGDGTs in the lake sedimentary record, indicatedby remarkably lower methylation of branched tetraethers ( MBT 5 ME ′ = 0.46 ± 0.02 in creek bed sediments and 0.38±0.01 in lake coresediments; p ) and a higher degree of cyclization (DC  = 0.23±0.02 in creek bed sediments and 0.32±0.08 in lake coresediments). Thus, in this small catchment, brGDGTs do not allow us to tracesoil OC transport. Nevertheless, the downcore changes in the degree ofcyclization and the abundance of isoprenoid GDGTs produced by methanogens inthe Loe Pool sediment do reflect local environmental conditions overthe past 100 years and have recorded the eutrophication history of thelake.

Assessing branched tetraether lipids as tracers of soil organic carbon transport through the Carminowe Creek catchment (southwest England)