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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Enzymatically hydrolyzable protein and carbohydrate sedimentary pools as indicators of the trophic state of detritus sink systems: A case study in a Mediterranean coastal lagoon
Auteurs :	A. Pusceddu, Auteur ; A. Dell'Anno, Auteur ; R. Danovaro, Auteur ; E. Manini, Auteur ; G. Sara, Auteur ; M. Fabiano, Auteur
Type de document :	Article
Dans :	Estuaries (26(3) JUN 2003)
Article en page(s) :	641-650
Résumé :	In order to classify the trophic state of detritus sink systems, instead of the conventional indicators based on inorganic nutrient availability and algal biomass and productivity in the water column, we used new biochemical descriptors based on the amount of sedimentary organic carbon (C) and nitrogen (N) potentially available to heterotrophs. We investigated spatial and temporal changes in microphytobenthic biomass, organic matter biochemical composition, and enzymatically hydrolyzable protein and carbohydrate pools along a north-south transect in the Marsala lagoon (Mediterranean Sea, Italy) at three stations characterized by different hydrodynamic conditions and organic matter content in the sediment. In the Marsala lagoon water currents decreased from north to south and this pattern was reflected by organic matter distribution and composition. Sediment organic matter concentrations were among the highest reported in the literature and, in the central area where large meadows of the seagrass Posidonia oceanica were present, display a strong dominance of highly refractory carbohydrates. The protein to carbohydrate ratio was always

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