Phytoplankton distribution and productivity in a highly turbid, tropical coastal system (Bach Dang Estuary, Vietnam)

2011

Article référencé dans le Web of Science WOS:000297393800019

Rochelle Newall Emma, Chu V.T., Pringault Olivier, Amouroux D., Arfi Robert, Bettarel Yvan, Bouvier Thierry, Bouvier C., Got P., Nguyen T. M. H., Mari Xavier, Navarro P., Duong T. N., Cao T. T. T., Pham T. T., Ouillon Sylvain, Torréton Jean-Pascal

Marine Pollution Bulletin, 2011, 62 (11), p. 2317-2329 ISSN 0025-326X

Phytoplankton diversity, primary and bacterial production, nutrients and metallic contaminants were measured during the wet season (July) and dry season (March) in the Bach Dang Estuary, a sub-estuary of the Red River system, Northern Vietnam. Using canonical correspondence analysis we show that phytoplankton community structure is potentially influenced by both organometallic species (Hg and Sn) and inorganic metal (Hg) concentrations. During March, dissolved methylmercury and inorganic mercury were important factors for determining phytoplankton community composition at most of the stations. In contrast, during July, low salinity phytoplankton community composition was associated with particulate methylmercury concentrations, whereas phytoplankton community composition in the higher salinity stations was more related to dissolved inorganic mercury and dissolved mono and tributyltin concentrations. These results highlight the importance of taking into account factors other than light and nutrients, such as eco-toxic heavy metals, in understanding phytoplankton diversity and activity in estuarine ecosystems.

Limnologie biologique / Océanographie biologique [034] ; Pollution [038]

Fonds IRD [F B010054248]

fdi:010054248