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      Deep pore water profiles reflect enhanced microbial activity towards tidal flat margins

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      General Information:

      Citation:
      Beck, M. , Köster, B. , Engelen, B. and Holstein, J. M. (2009): Deep pore water profiles reflect enhanced microbial activity towards tidal flat margins , Ocean Dynamics, 59 , pp. 371-383 . doi: 10.1007/s10236-008-0176-z
      Cite this page as:
      hdl:10013/epic.39782
      DOI:
      https://doi.org/10.1007/s10236-008-0176-z
      Official URL:
      https://doi.org/10.1007/s10236-008-0176-z
      Contact Email:
      jan.holstein@awi.de
      Related Data:

      Abstract:

      Microbial activity in permeable tidal flat margin sediments is enhanced by two main processes. First, organic matter is supplied by rapid sedimentation at prograding tidal flat margins. Second, surface and deep pore water advection lead to a replenishment of the dissolved organic matter and sulfate pools. Increasing microbial activity towards the low water line is reflected in sulfate and methane profiles as well as in total cell numbers, sulfate reduction rates, and remineralization products. The impact of high sedimentation rates on pore water biogeochemistry is confirmed by inverse modeling reproducing the depth profiles obtained by measurements. In central parts of the tidal flats, low sedimentation rates and pore water flow velocities limit microbial activity despite the high availability of electron acceptors for microbial respiration such as sulfate. Therefore, tidal flat margins with high microbial activity are of special importance for budgeting biogeochemical cycling in tidal flat areas.

      Further Details:

      Item Type:
      Article
      Authors:
      Beck, M. ; Köster, B. ; Engelen, B. ; Holstein, J. M.
      Divisions:
      AWI Organizations > Biosciences > Functional Ecology
      Programs:
      Basic Research > Helmholtz Independent Research
      Eprint ID:
      30772
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      Alfred-Wegener-Institut
      Helmholtz-Zentrum für Polar-
      und Meeresforschung
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