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Journal Article

Hydrogen, carbon monoxide, and methane dynamics in Lake Constance

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Conrad,  R       
Department of Biogeochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Citation

Schmidt, U., & Conrad, R. (1993). Hydrogen, carbon monoxide, and methane dynamics in Lake Constance. Limnology and Oceanography, 38(6), 1214-1226. doi:10.4319/lo.1993.38.6.1214.


Cite as: https://hdl.handle.net/21.11116/0000-000F-BF8F-A
Abstract
The vertical distributions of dissolved H-2, CO, and CH4 and bacterial
production (thymidine incorporation) were measured throughout 1987 in
Lake Constance (Bodensee) and again in 1988 at a station in a small
bight in the lake. Lake waters were supersaturated with respect to
atmospheric H-2, CO, and CH4, especially in the epilimnion;
concentrations in the surface water showed a significant (P < 0.05)
positive correlation with either autotrophic picoplankton, primary
production, Chl a, pheophytin, or bacterial production. Dissolved H-2
and CO did not exhibit a distinct seasonal pattern, but dissolved CH4
regularly increased during stratification and decreased in winter.
Vertical profiles showed that surface maxima of CH4 were not due to
diffusion from methanogenic profundal sediment. Lateral transects and
epilimnetic mass balance indicated that CH4 may have originated from
methanogenic littoral sediments along the shoreline and may also have
been produced in oxic epilimnetic water by unknown processes. The water
samples contained microbes able to oxidize H-2, CO, and CH4, but
threshold concentrations required to sustain oxidation usually were
higher than actual in situ concentrations of these gases. We therefore
inferred that epilimnetic production of the gases was balanced by
evasion to the atmosphere. With the stagnant film model, we determined
that the mean residence times of the gases in the epilimniom were on the
order of 2-16 d.