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      Interactions for algae-degrading benthic microbial communities in deep-sea sediments along the Antarctic Polar Front.

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      General Information:

      Citation:
      Ruff, E. S. , Probandt, D. , Zinkann, A. C. , Iversen, M. , Klaas, C. , Würzberg, L. , Krombholz, N. , Wolf-Gladrow, D. , Amann, R. and Knittel, K. (2014): Interactions for algae-degrading benthic microbial communities in deep-sea sediments along the Antarctic Polar Front. , Deep-Sea Research Part II-Topical Studies in Oceanography, 108 , pp. 6-16 . doi: 10.1016/j.dsr2.2014.05.011
      Cite this page as:
      hdl:10013/epic.45702
      DOI:
      https://doi.org/10.1016/j.dsr2.2014.05.011
      Contact Email:
      morten.iversen@awi.de
      Related Data:

      Platform/Expeditions:
      • ANT-XXVIII
      Abstract:

      Phytoplankton blooms in surface waters of the oceans are known to influence the food web and impact microbial as well as zooplankton communities. Numerous studies have investigated the fate of phytoplankton-derived organic matter in surface waters and shelf sediments, however, little is known about the effect of sinking algal biomass on microbial communities in deep-sea sediments. Here, we analyzed sediments of four regions in the Southern Atlantic Ocean along the Antarctic Polar Front that had different exposures to phytoplankton bloom derived organic matter. We investigated the microbial communities in these sediments using high-throughput sequencing of 16S rRNA molecules to determine microorganisms that were active and catalyzed reporter deposition fluorescence in situ hybridization to infer their abundance and distribution. The sediments along the Antarctic Polar Front harbored microbial communities that were highly diverse and contained microbial clades that seem to preferably occur in regions of high primary productivity. We showed that organisms affiliated with the gammaproteobacterial clade NOR5/OM60, which is known from surface waters and coastal sediments, thrive in the deep-sea. Benthic deep-sea NOR5 were abundant, diverse, distinct from pelagic NOR5 and likely specialized on the degradation of phytoplankton-derived organic matter, occupying a similar niche as their pelagic relatives. Algal detritus seemed to not only fuel the benthic microbial communities of large areas in the deep-sea, but also to influence communities locally, as we found a peak in Flavobacteriaceae-related clades that also include degraders of algal biomass. The results strongly suggest that phytoplankton-derived organic matter was rapidly exported to the deep-sea, nourished distinct benthic microbial communities and seemed to be the main energy source for microbial life in the seafloor of vast abyssal regions along the Antarctic Polar Front.

      Further Details:

      Item Type:
      Article
      Authors:
      Ruff, E. S. ; Probandt, David ; Zinkann, Ann-Christine ; Iversen, Morten ; Klaas, Christine ; Würzberg, Laura ; Krombholz, Nicole ; Wolf-Gladrow, Dieter ; Amann, R. ; Knittel, K.
      Divisions:
      AWI Organizations > Biosciences > Joint Research Group: Deep Sea Ecology and Technology
      AWI Organizations > Climate Sciences > Junior Research Group: SEAPUMP
      Primary Division:
      Organizations > AWI Organizations > Biosciences > Joint Research Group: Deep Sea Ecology and Technology
      Programs:
      Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 1: Changes and regional feedbacks in Arctic and Antarctic > WP 1.4: Arctic sea ice and its interaction with ocean and ecosystems
      Primary Topic:
      Helmholtz Programs > Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 1: Changes and regional feedbacks in Arctic and Antarctic > WP 1.4: Arctic sea ice and its interaction with ocean and ecosystems
      Eprint ID:
      37911
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