BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-9-3425-2012 Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments Sawicka J. E. 1 3 Jørgensen B. B. 2 Brüchert V. 3 Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark Department of Geological Sciences, Stockholm University, Sweden 30 08 2012 9 8 3425 3435 Copyright: © 2012 J. E. Sawicka et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/9/3425/2012/bg-9-3425-2012.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/9/3425/2012/bg-9-3425-2012.pdf

The temperature responses of sulfate-reducing microbial communities were used as community temperature characteristics for their in situ temperature adaptation, their origin, and dispersal in the deep sea. Sediments were collected from a suite of coastal, continental shelf, and slope sediments from the southwest and southeast Atlantic and permanently cold Arctic fjords from water depths ranging from the intertidal zone to 4327 m. In situ temperatures ranged from 8 °C on the shelf to −1 °C in the Arctic. Temperature characteristics of the active sulfate-reducing community were determined in short-term incubations with <sup>35</sup>S-sulfate in a temperature gradient block spanning a temperature range from 0 to 40 °C. An optimum temperature (<i>T</i><sub>opt</sub>) between 27 °C and 30 °C for the South Atlantic shelf sediments and for the intertidal flat sediment from Svalbard was indicative of a psychrotolerant/mesophilic sulfate-reducing community, whereas <i>T</i><sub>opt</sub> &le;20 °C in South Atlantic slope and Arctic shelf sediments suggested a predominantly psychrophilic community. High sulfate reduction rates (20–50%) at in situ temperatures compared to those at <i>T</i><sub>opt</sub> further support this interpretation and point to the importance of the ambient temperature regime for regulating the short-term temperature response of sulfate-reducing communities. A number of cold (<4 °C) continental slope sediments showed broad temperature optima reaching as high as 30 °C, suggesting the additional presence of apparently mesophilic sulfate-reducing bacteria. Since the temperature characteristics of these mesophiles do not fit with the permanently cold deep-sea environment, we suggest that these mesophilic microorganisms are of allochthonous origin and transported to this site. It is likely that they were deposited along with the mass-flow movement of warmer shelf-derived sediment. These data therefore suggest that temperature response profiles of bacterial carbon mineralization processes can be used as community temperature characteristics, and that mixing of bacterial communities originating from diverse locations carrying different temperature characteristics needs to be taken into account to explain temperature response profiles of bacterial carbon mineralization processes in sediments.

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