Reference : Estimating carbon fluxes in a Posidonia oceanica system: Paradox of the bacterial car...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/193283
Estimating carbon fluxes in a Posidonia oceanica system: Paradox of the bacterial carbon demand
English
Velimirov, Branko mailto []
Lejeune, Pierre mailto []
Kirschner, A. []
Jousseaume, Matthieu []
Abadie, Arnaud mailto [Université de Liège - ULg > > > Form.doct. sc. (océanographie - Bologne)]
Pete, Dorothée mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Dauby, Patrick mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale >]
Richir, Jonathan mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
Gobert, Sylvie mailto [Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique >]
20-Mar-2016
Estuarine Coastal & Shelf Science
Academic Press
171
23-34
Yes (verified by ORBi)
International
0272-7714
1096-0015
London
United Kingdom
[en] Seagrass ; Mediterranean Sea ; Posidonia oceanica system ; Primary producers ; Bacteria ; Carbon flow
[en] A mass balance ecosystemic approach, based on bacterial carbon demands and primary production data, was used to investigate if the bacterial community (freewater bacterioplankton and benthic bacteria of the oxygenated sediment layer) could be sustained by the main primary producers (Posidonia oceanica and its epiphytes, adjacent macroalgae and phytoplankton communities; hereafter called the P. oceanica system) of a non-eutrophic Mediterranean bay. Unexpectedly, the findings of this study differed from previous works that used benthic incubation chamber and O2 optode methods. In this study, data were grouped in two categories, corresponding to two time periods, according to the seawater temperature regime (<18 °C or >18 °C): from May to October and from November to April. Between May and October, the produced benthic macrophyte tissues could not provide the carbon required by the bacteria of the oxygenated sediment layer, showing that the balance production of the investigated bay was clearly heterotrophic (i.e. negative) during this time period. In contrast, between November and April, benthic bacteria respiration nearly equated to carbon production. When integrating the open water carbon dynamics above the meadow in the model, a negative carbon balance was still observed between May and October, while a slight carbon excess was noticed between November and April. In the light of these findings, the carbon balance being negative on an annual basis, alternative carbon sources are required for the maintenance of the bacterial carbon production.
Medical University of Vienna, Center for Pathobiochemistry and Genetics, Währingerstr.10, 1090 Vienna, Austria ; STARESO
Funding was provided by the University of Liege (Fonds spéciaux C-10/78), the Territorial Collectivity of Corsica and the French Water Agency (PACA-Corsica)
This study is part of the STARECAPMED (STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystems Drifts)
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/193283
10.1016/j.ecss.2016.01.008

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