Rapid bacterial mineralization of organic carbon produced during a phytoplankton bloom induced by natural iron fertilization in the Southern Ocean

被引：69
作者：
Obernosterer, Ingrid [1 ,2 ]
Christaki, Urania [3 ]
Lefèvre, Dominique [4 ]
Catala, Philippe [1 ,2 ]
Van Wambeke, France [4 ]
Lebaron, Philippe [1 ,2 ]
机构：
[1] UPMC Univ Paris 06, UMR 7621, LOBB
[2] CNRS, UMR 7621, LOBB, Observatoire Océanologique
[3] Laboratoire d'Océanologie et de Géosciences, CNRS, UMR LOG 8187, 62930 Wimereux
[4] Laboratoire de Microbiologie, Géologie et Ecologie Marine (LMGEM), CNRS 6117, 13288 Marseille Cedex 9, Campus de Luminy
来源：
Deep-Sea Research Part II: Topical Studies in Oceanography | 2008年 / 55卷 / 5-7期
关键词：
Bacterial growth efficiency; Bacterial respiration; Heterotrophic bacteria; High nucleic acid cells; Natural iron fertilization; Southern Ocean;
D O I：
10.1016/j.dsr2.2007.12.005
中图分类号：
学科分类号：
摘要：
The response of heterotrophic bacteria (Bacteria and Archaea) to the spring phytoplankton bloom that occurs annually above the Kerguelen Plateau (Southern Ocean) due to natural iron fertilization was investigated during the KErguelen Ocean and Plateau compared Study (KEOPS) cruise in January-February 2005. In surface waters (upper 100 m) in the core of the phytoplankton bloom, heterotrophic bacteria were, on an average, 3-fold more abundant and revealed rates of production ([3H] leucine incorporation) and respiration (<0.8 μm size fraction) that exceeded those in surrounding high-nutrient low-chlorophyll (HNLC) waters by factors of 6 and 5, respectively. These differences in bacterial metabolic activities were attributable to high-nucleic-acid-containing cells that dominated (≈80% of total cell abundance) the heterotrophic bacterial community associated with the phytoplankton bloom. Bacterial growth efficiencies varied between 14% and 20% inside the bloom and were <10% in HNLC waters. Results from bottle-incubation experiments performed at the bloom station indicated that iron had no direct but an indirect effect on heterotrophic bacterial activity, due to the stimulation by phytoplankton-derived dissolved organic matter. Within the Kerguelen bloom, bacterial carbon demand accounted for roughly 45% of gross community production. These results indicate that heterotrophic bacteria processed a significant portion of primary production, with most of it being rapidly respired. © 2008 Elsevier Ltd. All rights reserved.
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页码：777 / 789
页数：12
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