Enhanced calcite dissolution in the presence of the Aerobic Methanotroph Methylosinus trichosporium

Krause, Stefan, Aloisi, Giovanni, Engel, Anja, Liebetrau, Volker and Treude, Tina (2014) Enhanced calcite dissolution in the presence of the Aerobic Methanotroph Methylosinus trichosporium Geomicrobiology Journal, 31 (4). pp. 325-337. DOI 10.1080/01490451.2013.834007.

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Microbial aerobic methane oxidation (MOx) is intrinsically coupled to the production of carbon dioxide, favoring carbonate dissolution. Recently, microbial organic polymers were shown to be able to induce carbonate dissolution. To discriminate between different mechanisms causing calcite dissolution, experiments were conducted in the presence of solid calcite with (1) actively growing cells (2) starving cells, and (4) dead cells of the methanotrophic bacterium Methylosinus trichosporium under brackish conditions (salinity 10) near calcite saturation (saturation state (Ω) 1.76 to 2.22). Total alkalinity and the amount of dissolved calcium markedly increased in all experiments containing M. trichosporium cells. After initial system equilibration, similar calcite dissolution rates, ranging between 14.9 (dead cells) and 29.6 μmol l−1 d−1 (actively growing cells), were observed. While concentrations of transparent exopolymer particles declined with time in the presence of actively growing and starving cells, they increased in experiments with dead cells. Scanning electron microscopy images of calcite crystals revealed visible surface corrosion after exposure to live and dead M. trichosporium cells. The results of this study indicate a strong potential for microbial MOx to affect calcite stability negatively, facilitating calcite dissolution. In addition to CO2 production by methanotrophically active cells, we suggest that the release of acidic or Ca2+-chelating organic carbon compounds from dead cells could also enhance calcite dissolution.

Document Type: Article
Additional Information: WOS:000331692300006
Keywords: carbonate; cold seep; methane; ocean acidification; saturation rate
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
DOI etc.: 10.1080/01490451.2013.834007
ISSN: 0149-0451
Projects: Future Ocean
Date Deposited: 21 Jan 2014 10:04
Last Modified: 28 Sep 2017 08:02
URI: http://eprints.uni-kiel.de/id/eprint/23149

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