ORBi: Gazeau Frédéric - Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods

Reference : Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation o...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Aquatic sciences & oceanology Life sciences : Environmental sciences & ecology Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/2134

Title :	Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods
Language :	English
Author, co-author :	Gazeau, Frédéric [> > > >]
	Borges, Alberto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
	Barrón, Cristina [Institut Mediterrani d’Estudis Avançats (CSIC-UIB)]
	Duarte, Carlos M. [Institut Mediterrani d’Estudis Avançats (CSIC-UIB)]
	Iversen, Niels [Aalborg Universitet (AU)]
	Middelburg, Jack J. [Netherlands Institute of Ecology (NIOO-KNAW) > Centre for Estuarine and Marine Ecology]
	Delille, Bruno [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
	Pizay, Marie-Dominique [CNRS-Université de Paris > Laboratoire d’Océanographie de Villefranche]
	Frankignoulle, Michel [> > > >]
	Gattuso, Jean-Pierre [CNRS-Université de Paris > Laboratoire d’Océanographie de Villefranche]
Publication date :	2005
Journal title :	Marine Ecology. Progress Series
Publisher :	Inter-Research
Volume :	301
Pages :	23-41
Audience :	International
ISSN :	0171-8630
City :	Oldendorf Luhe
Keywords :	[en] ecosystem metabolism ; estuaries ; primary production ; respiration ; Randers Fjord ; oxygen ; carbon dynamics
Abstract :	[en] The metabolic status, the difference between organic matter production and consumption of an estuary (Randers Fjord, Denmark) has been assessed based on 2 field cruises in April and August 2001 and a number of approaches: (1) the oxygen (02) incubation method, (2) dissolved inorganic carbon (DIC) budgets, (3) the response surface difference (RSD) method based on diel O-2 changes and (4) land-ocean interaction in the coastal zone (LOICZ) budgets based on dissolved inorganic phosphorus (DIP). Although each method has its own associated limitations and uncertainties, the above approaches converged most of the time in consistent metabolic estimates, both in sign and magnitude, and revealed that this system was near metabolic balance in spring (net ecosystem production: NEP similar to 0) and net heterotrophic in summer (NEP similar to -50 mmol C m(-2) d(-1)). In this shallow estuary (mean depth = 1.6 m), the benthic compartment was very active and represented 70 and 30% of the total gross primary production in April and August, respectively. NEP rates measured during this study are in the range of previously reported rates in estuaries.
Funders :	Commission européenne : Direction générale de la Recherche ; Centre National pour la Recherche Scientifique ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Name of the research project :	Eurotroph
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/2134
DOI :	10.3354/meps301023

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