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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Phytoplankton Dynamics and Its Further Implication for Particulate Organic Carbon in Surface Waters of a Tropical/Subtropical Estuary
Auteurs :	Zhuo-Yi Zhu, Auteur ; Su-Mei Liu, Auteur ; Ying Wu, Auteur ; Ying Li, Auteur ; Jing Zhang, Auteur ; Jun Hu, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(3) MAY 2015)
Article en page(s) :	905-916
Résumé :	Phytoplankton succession along with salinity in estuaries not only influences the riverine ecosystem but also interferes our understanding of riverine materials (e.g., organic carbon) transport to the sea. Four cruises were conducted in a mid-size river and its estuary (i.e., the Wanquan River) to elucidate the riverine phytoplankton decease along increasing salinity and to quantify the amount of algal particulate organic carbon (POC) present in the system at different seasons. CHEMTAX calculations suggested that chlorophytes were the main chlorophyll a (CHLa) contributor in the dissolved inorganic phosphorus-limited river, which contributed over 60 % of the total CHLa. Microscopy further revealed that the dominant species was Scenedesmus sp. In the estuary, phytoplankton succession along with salinity in the estuary was observed. Chlorophyte contribution to total CHLa dramatically decreased from over 60 % in the river (S = 0) segment to 20, suggesting the removal of riverine algae in the estuary. The mean algal POC concentration ranged from 80 mu g/L (summer) to 140 mu g/L (winter), and the riverine algal POC accounted for 6-56 % of the bulk riverine POC. The annual flux of riverine algal POC was estimated to be 660 tons.

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