[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.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
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 - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Pizay, Marie-Dominique; CNRS-Université de Paris > Laboratoire d’Océanographie de Villefranche
Frankignoulle, Michel; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Gattuso, Jean-Pierre; CNRS-Université de Paris > Laboratoire d’Océanographie de Villefranche
Language :
English
Title :
Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods
Publication date :
2005
Journal title :
Marine Ecology. Progress Series
ISSN :
0171-8630
eISSN :
1616-1599
Publisher :
Inter-Research, Oldendorf Luhe, Germany
Volume :
301
Issue :
-
Pages :
23-41
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Eurotroph
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation CNRS - Centre National de la Recherche Scientifique F.R.S.-FNRS - Fonds de la Recherche Scientifique
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