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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 9 | Copyright
Biogeosciences, 8, 2609-2620, 2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Sep 2011

Research article | 14 Sep 2011

Dynamics of nutrients, total organic carbon, prokaryotes and viruses in onboard incubations of cold-water corals

C. Maier1,2,3, A. de Kluijver3, M. Agis1,2, C. P. D. Brussaard3, F. C. van Duyl3, and M. G. Weinbauer1,2 C. Maier et al.
  • 1INSU-CNRS, Laboratoire d'Océanographie de Villefranche, UMR 7093, B.P. 28, 06234 Villefranche-sur-Mer Cedex, France
  • 2Université Pierre et Marie-Curie-Paris, Laboratoire d'Océanographie de Villefranche, UMR 7093, 06230 Villefranche-sur-mer, France
  • 3Department of Biological Oceanography, Royal Netherlands Institute for Sea Research (NIOZ), P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands

Abstract. The potential influence of the cold-water corals (CWCs) Lophelia pertusa and Madrepora oculata on the dynamics of inorganic nutrient and total organic carbon (TOC) concentrations and the abundances of prokaryotes and viruses in bottom water was assessed in onboard incubation experiments. Ammonium, nitrite, dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and TOC concentrations and N:P ratios were typically higher in incubation water with corals than in controls, whereas nitrate concentrations did not reveal a clear trend. Mucus release (normalized to coral surface) was estimated by the net increase rate of TOC concentrations and averaged 23 ± 6 mg C m−2 h−1 for L. pertusa and 21 ± 8 mg C m−2 h−1 for M. oculata. Prokaryotic and viral abundance and turnover rates were typically stimulated in incubation water with corals. This estimated prokaryotic stimulation averaged 6.0 ± 3.0 × 109 cells m−2 h−1 for L. pertusa and 8.4 ± 2.9 × 109 cells m−2 h−1 for M. oculata, whereas the estimated viral stimulation averaged 15.6 ± 12.7 × 109 particles m−2 h−1 for L. pertusa and 4.3 ± 0.4 × 109 particles m−2 h−1 M. oculata. Our data suggest that prokaryotes and viruses are released from corals and that nutrient and mucus release enhanced prokaryotic and viral production. The result of this stimulation could be a fuelling of bottom water in CWC reefs with nutrients and organic matter and consequently an enhancement of microbe-mediated processes.

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