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Article Dans Une Revue Marine Pollution Bulletin Année : 2012

Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Résumé

The environmental characteristics of Ahe deep lagoon (Tuamotu Archipelago, French Polynesia) were studied over 3 years with the aim of explaining the spatial and temporal variability of the natural food available for pearl oysters with a special focus on phytoplankton biomass and global photosynthesis/respiration ratio of the lagoon. Chlorophyll averaged 0.34±0.01 μg L(-1) and our findings did not confirm increased phytoplankton biomass in deep lagoonal waters. Phytoplankton production appears to be limited firstly by nitrogen and respiratory processes overpass photosynthetic processes at least in the north-eastern edge of the atoll. Grazing by pearl oysters in culture seems to decrease the POC concentration but not the phytoplankton biomass. Oysters graze mainly on non chlorophyllian particles.
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Dates et versions

hal-01990278 , version 1 (23-01-2019)

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  • HAL Id : hal-01990278 , version 1

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Loïc Charpy, Martine Rodier, Jonathan Fournier, Marie-José Langlade, Nabila Gaertner-Mazouni. Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia. Marine Pollution Bulletin, 2012, 65 (10-12), pp.471-477. ⟨hal-01990278⟩
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