Production primaire et respiration des communautés d’herbiers à zostères : rôle dans le cycle carbone en milieu côtier

Abstract : Seagrass beds host a great vegetal and animal diversity and have been considered to be highly productive. However, carbon fluxes of these communities are overlooked, in particular, in the intertidal seagrass communities which are subjected to strong environmental constraints. The aim of this study is to investigate the functionning of intertidal seagrass beds to understand their role in carbon cycle in the coastal zone. Metabolism and food web structure variations have been studied in two seagrass beds, a Zostera marina bed located in the upper zone of infralittoral and the lower zone of midlittoral and a Zostera noltii bed located only in the midlittoral zone. An increase of community carbon fluxes from emersion to immersion has been highlighted for the two seagrass beds. An asynchroneous development of Zostera noltii and associated epiphytes has been observed and could maintain a relative stable primary production throughout of the year. Two main primary producers have been identified in Zostera marina beds ( Zostera marina and ephemeral macroalgae). Their development enhanced the community metabolism during the spring and the summer. An annual carbon budget which take into account spatial and temporal variability of primary producer biomass and metabolism was proposed. Finally, this study underlined the major role of the detritic pathway in the matter flow within th food web of intertidal Zostera marina and Zostera noltii beds.
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Vincent Ouisse. Production primaire et respiration des communautés d’herbiers à zostères : rôle dans le cycle carbone en milieu côtier. Ecologie, Environnement. Paris 6, 2010. Français. ⟨tel-01110521⟩

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