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A closed-chamber CO2-flux method for estimating intertidal primary production and respiration under emersed conditions |
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| Authors: | A Migné D Davoult N Spilmont D Menu G Boucher J-P Gattuso H Rybarczyk |
| Institution: | Laboratoire d'Hydrobiologie, IFR 101, Université Paris VI, 12 rue Cuvier, 75005 Paris, France, Laboratoire Biogéochimie et Environnement du Littoral (LABEL), ESA 8013, Université du Littoral C?te d'Opale, MREN 32 av. Foch, 62930 Wimereux, France, Station Marine de Wimereux, ESA 8013, B.P. 80, 62930 Wimereux, France, Biologie des Invertébrés Marins, ESA 8044, MNHN, Pavillon Chevreul, 57 rue Cuvier, 75231 Paris Cedex, France, Laboratoire d'Océanographie, ESA 7076, Observatoire Océanologique, B.P. 28, 06234 Villefranche-sur-mer Cedex, France, |
| Abstract: | This paper describes a closed-chamber method for measuring CO2 fluxes in intertidal soft sediments during periods of emersion. The method relies on closed-circuit incubations of undisturbed sediment and measurement of CO2 exchanges using an infrared gas analyser. The method was assessed during field experiments, both in light and dark conditions, on an exposed sandy beach and in an estuary. The rates of gross community production measured under moderate irradiance (4.2 mg C m-2 h-1 on the exposed sandy beach and 35 mg C m-2 h-1 in the estuary) are in good agreement with rates reported in the literature. In conjunction with appropriate sampling strategies, this method can be useful for estimating and comparing production of intertidal areas or for assessing factors that influence production. |
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