Aquatic Geochemistry

, Volume 12, Issue 1, pp 1–19

Benthic Oxygen Consumption and Organic Matter Turnover in Organic-poor, Permeable Shelf Sands

  • Antje Rusch
  • Markus Huettel
  • Christian Wild
  • Clare E. Reimers
Article

DOI: 10.1007/s10498-005-0784-x

Cite this article as:
Rusch, A., Huettel, M., Wild, C. et al. Aquat Geochem (2006) 12: 1. doi:10.1007/s10498-005-0784-x

Abstract

The high permeability of sediments and strong near-bottom currents cause seawater to infiltrate the surface layers of Middle Atlantic Bight shelf deposits. In this study, sandy sediment cores from 11 to 12 m water depth were percolated with filtered seawater on shipboard. Sedimentary oxygen consumption (SOC) increased non-linearly with pore water flow, approaching maximum rates of 120 mmol m−2 d−1 (May 2001) or 75 mmol m−2 d−1(July 2001). The addition of acetate to the inflowing water promptly enhanced the release of dissolved inorganic carbon (DIC) from the cores. DIC production rates were a linear function of acetate concentration, ranging from 100 to 300 mmol m−2 d−1 without substrate addition to 572 mmol m−2 d−1 with 100 mM acetate. The sediments also hydrolyzed a glucose pseudopolymer, and the liberated glucose prompted an increase of SOC. Our results suggest that decomposition rates of organic matter in permeable sands can exceed those of fine-grained, organic-rich deposits, when water currents cause advective interstitial flow, supplying the subsurface microbial community with degradable material and electron acceptors. We conclude that the highly permeable sand beds of the Middle Atlantic Bight are responsive within minutes to hours and efficiently operate as biocatalytical filters.

Keywords

benthic mineralization pore water flow biocatalytical filter oxygen DOM DIC permeable sediment shelf sands 

Copyright information

© Springer 2006

Authors and Affiliations

  • Antje Rusch
    • 1
    • 3
  • Markus Huettel
    • 1
    • 4
  • Christian Wild
    • 5
  • Clare E. Reimers
    • 2
  1. 1.Max Planck Institute for Marine MicrobiologyBremenGermany
  2. 2.Hatfield Marine Science CenterOregon State UniversityNewportU.S.A
  3. 3.Department of Geology and GeophysicsUniversity of Hawaii at ManoaHonoluluU.S.A
  4. 4.Department of OceanographyFlorida State UniversityTallahasseeU.S.A
  5. 5.GeoBio-CenterLudwig-Maximilians-UniversitätMünchenGermany

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