| Title | The role of iron in the bacterial degradation of organic matter derived from Phaeocystis antarctica |
| Author | Becquevort, S.; Lancelot, C.; Schoemann, V. |
| Author Affil | Becquevort, S., Université Libre de Bruxelles, Ecologie des Systèmes Aquatiques, Brussels, Belgium. Other: Laboratoire des Sciences du Climat et de l'Environnment, France; Université Libre de Bruxelles, Belgium; Skidaway Institute of Oceanography |
| Source | Phaeocystis, major link in the biogeochemical cycling of climate-relevant elements, edited by M.A. van Leeuwe, J. Stefels, S. Belviso, C. Lancelot, P.G. Verity and W.W.C. Gieskes. Biogeochemistry (Dordrecht), 83(1-3), p.119-135, . Publisher: Springer, Dordrecht - Boston - Lancaster, International. ISSN: 0168- 2563 |
| Publication Date | Mar. 2007 |
| Notes | In English. 75 refs. Ant. Acc. No: 83634. GeoRef Acc. No: 282671 |
| Index Terms | algae; bacteria; degradation; ecology; metals; plankton; plant ecology; Southern Ocean--Prydz Bay; Southern Ocean--Ross Sea; concentration; iron; mineralization; nutrients; Phaeocystis; phytoplankton; Plantae; productivity; Prydz Bay; Ross Sea; Southern Ocean |
| Abstract | In high-nutrient low-chlorophyll areas, bacterial degradation of organic matter may be iron-limited. The response of heterotrophic bacteria to Fe addition may be directly controlled by Fe availability and/or indirectly controlled through the effect of enhanced phytoplankton productivity and the subsequent supply of organic matter suitable for bacteria. In the present study, the role of Fe on bacterial carbon degradation was investigated through regrowth experiments by monitoring bacterial response to organic substrates derived from Phaeocystis antarctica cultures set up in ‹1 nM Fe (LFe) and in Fe-amended (HFe) Antarctic seawater. Results showed an impact of Fe addition on the morphotype dominance (colonies vs. single cells) of P. antarctica and on the quality of Phaeocystis-derived organic matter. Fe addition leaded to a decrease of C/N ratio of Phaeocystis material. The bacterial community composition was modified as observed from denaturing gradient gel electrophoresis (DGGE) profiles in LFe as compared to HFe bioassays. (mod. journ. abst.) |
| URL | http://hdl.handle.net/10.1007/s10533-007-9079-1 |
| Publication Type | journal article |
| Record ID | 62003033 |