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Complex coupled metabolic and prokaryotic community responses to increasing temperatures in anaerobic marine sediments: critical temperatures and substrate changes

Roussel, Erwan Georges Philippe, Cragg, Barry Andrew, Webster, Gordon, Sass, Henrik, Tang, Xiaohong, Williams, Angharad S., Gorra, Roberta, Weightman, Andrew John and Parkes, Ronald John 2015. Complex coupled metabolic and prokaryotic community responses to increasing temperatures in anaerobic marine sediments: critical temperatures and substrate changes. FEMS Microbiology Ecology 91 (8) , fiv084. 10.1093/femsec/fiv084

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Abstract

The impact of temperature (0 - 80°C) on anaerobic biogeochemical processes and prokaryotic communities in marine sediments (tidal flat) was investigated in slurries for up to 100 days. Temperature had a non-linear effect on biogeochemistry and prokaryotes with rapid changes over small temperature intervals. Some activities (e.g. methanogenesis) had multiple “windows” within a large temperature range (∼10 - 80°C). Others, including acetate oxidation, had maximum activities within a temperature zone, which varied with electron acceptor (metal oxide [up to ∼34°C] and sulphate [up to ∼50°C]). Substrates for sulphate reduction changed from predominantly acetate below, and H2 above, a 43°C critical temperature; along with changes in activation energies and types of sulphate-reducing Bacteria. Above ∼43°C, methylamine metabolism ceased with changes in methanogen types and increased acetate concentrations (>1mM). Abundances of uncultured Archaea, characteristic of deep marine sediments (e.g. MBGD Euryarchaeota, ‘Bathyarchaeota’) changed, indicating their possible metabolic activity and temperature range. Bacterial cell numbers were consistently higher than archaeal cells and both decreased above ∼15°C. Substrate addition stimulated activities, widened some activity temperature ranges (methanogenesis) and increased bacterial (x10) more than archaeal cell numbers. Hence, additional organic matter input from climate-related eutrophication may amplify the impact of temperature increases on sedimentary biogeochemistry.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Earth and Ocean Sciences
Water Research Institute (WATER)
Subjects: Q Science > QE Geology
Q Science > QR Microbiology
Publisher: Oxford University Press
ISSN: 1574-6941
Funders: Natural Environment Research Council, EU
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 15 July 2015
Last Modified: 16 Sep 2019 10:31
URI: http://orca.cf.ac.uk/id/eprint/75082

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