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Aquatic Microbial Ecology

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AME 80:181-192 (2017)  -  DOI:

Effect of salinity on microbial methane oxidation in freshwater and marine environments

Roman Osudar1,2, Karl-Walter Klings1, Dirk Wagner2, Ingeborg Bussmann1,*

1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Kurpromenade 201, 27498 Helgoland, Germany
2GFZ German Research Centre for Geosciences, Helmholtz Center Potsdam, Section 5.3 Geomicrobiology, Telegrafenberg, 14473 Potsdam, Germany
*Corresponding author:

ABSTRACT: Salinity is an important environmental control of aerobic methane oxidation, which reduces the emission of the potent greenhouse gas methane into the atmosphere. The effect of salinity on methane oxidation is especially severe in river estuaries and adjacent coastal waters, which are important sources of methane emission and, at the same time, are usually characterized by pronounced salinity gradients. Using methane oxidation rates determined by a radiotracer technique as a measure of methanotrophic activity, we tested the effect of immediate and gradual salinity changes on pure cultures of methanotrophic bacteria, and natural freshwater (Elbe River) and natural marine (North Sea) methanotrophic populations. According to our results, Methylomonas sp. and Methylosinus trichosporium are resistant to an increase in salinity, whereas Methylovulum sp. and Methylobacter luteus are sensitive to such an increase. Natural methanotrophic populations from freshwater are more resistant to an increase in salinity than those from marine water are to a decrease in salinity. In contrast to an immediate change of salinity, gradual change (1.25 PSU d-1) can attenuate salinity stress. Experiments with the natural populations revealed different reactions to changes in salinity; thus, we assume that the initial composition of the methanotrophic population, i.e. the ratio of sensitive versus resistant strains, also governs the community response to salinity stress.

KEY WORDS: Microbial methane oxidation · Salinity · Osmoregulation

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Cite this article as: Osudar R, Klings KW, Wagner D, Bussmann I (2017) Effect of salinity on microbial methane oxidation in freshwater and marine environments. Aquat Microb Ecol 80:181-192.

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