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Sulfide and methane evolution in the hypolimnion of a subtropical lake: a three-year study

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Abstract

The differential impact of microbial sulfate reduction and methanogenesis on the mineralization of particulate organic carbon (POC) in warm monomictic Lake Kinneret (LK), Israel was studied during three consecutive lake cycles. The hypolimnetic accumulation of total sulfide and dissolved methane was examined in relation to the physical forcing of the water column and the settling flux of particulate matter. With the on-set of thermal stratification in spring, both solutes increased concomitantly with the depletion of oxygen, first in the benthic boundary layer, followed by the upper hypolimnion. Methane production was restricted to the sediments as emphasized by the persistently linear concentration gradient in the hypolimnion. Sulfate reduction occurred both in the sediments and the water column as revealed by the hypolimnetic distribution of sulfide and recurring metalimnetic sulfide peaks. Annual differences in the accumulation pattern of both solutes appeared to be primarily linked to the settling flux of POC and the length of the stratified season. Relatively lower hypolimnetic concentrations of dissolved methane during the stratified season of 2000 coincided with increased ebullition of gaseous methane, likely as the result of a nearly a 2 m drop in the lake level. Overall, sulfate reduction accounted for more than 60% of the POC settling flux, a finding that differs from similar studies made in temperate lakes where methanogenesis was shown to be the primary mode of terminal carbon mineralization. Intensive organic carbon turnover at the sediment water interface and comparatively high sulfate concentrations in LK are the most likely reason.

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Acknowledgements

This research was funded by a research grant DISUM 00047 from the BMBF-MOS Joint German-Israeli research program. We are grateful to our skippers James Easton and Meir Hatab for their help in the field and Julia Didenko and Efrat Uri for their assistance in sample possessing. Finally we wish to thank two anonymous reviewers for contributing to the improvement of the manuscript.

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Correspondence to Werner Eckert.

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Eckert, W., Conrad, R. Sulfide and methane evolution in the hypolimnion of a subtropical lake: a three-year study. Biogeochemistry 82, 67–76 (2007). https://doi.org/10.1007/s10533-006-9053-3

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