Low community photosynthetic quotient in coral reef sediments Un quotient photosynthétique des communautés faible dans les sédiments de récif corallien

Dorothée Taddei 1 Pascale Cuet 1 Patrick Frouin 1 Clémentine Esbelin 1 Jacques Clavier 2
1 ECOMAR - Laboratoire d'Ecologie Marine
2 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
Abstract : Fluxes of dissolved inorganic carbon and oxygen at the water-sediment interface were measured at eight coral reef stations (Indian Ocean) in summer and winter. The dark fluxes provided the community respiratory quotient (CRQ = dissolved inorganic carbon release / oxygen uptake) and the diurnal fluxes corrected from the dark fluxes gave the community photosynthetic quotient (CPQ = oxygen gross release / dissolved inorganic carbon gross uptake). The CRQ and the winter CPQ were not significantly different from 1. Summer CPQ (0.79; SD 0.02) was significantly lower than 1 due to the combined effect of the daily evolution of the community respiration and the discrepancy between the daily evolution in community oxygen respiration and community carbon respiration. These results highlight the importance of measuring simultaneously the benthic community production and respiration for long term integrated data sets, instead of the traditional daily or seasonal budget calculations from limited measures of community respiration.
Keywords : Community photosynthetic quotient Community respiratory quotient Coral reef Sediment Oxygen Carbon Reunion island
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Article dans une revue
Comptes Rendus Biologies, Elsevier Masson, 2008, 331 (9), pp.668-677. 〈10.1016/j.crvi.2008.06.006〉
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Soumis le : mercredi 15 février 2012 - 10:20:04
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24

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Dorothée Taddei, Pascale Cuet, Patrick Frouin, Clémentine Esbelin, Jacques Clavier. Low community photosynthetic quotient in coral reef sediments Un quotient photosynthétique des communautés faible dans les sédiments de récif corallien. Comptes Rendus Biologies, Elsevier Masson, 2008, 331 (9), pp.668-677. 〈10.1016/j.crvi.2008.06.006〉. 〈hal-00670285〉

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