title: Phytoplankton distribution and productivity in a highly turbid, tropical coastal system (Bach Dang Estuary, Vietnam).
abstract: 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.
authors.affiliation: ECOSYM, UMR 5119 (CNRS-IRD-UM2-IFREMER), Université Montpellier II, Case 093, Place Bataillon, 34095 Montpellier, France. emma.rochelle-newall@ird.fr
authors.forename: E J
authors.initials: EJ
authors.lastname: Rochelle-Newall
authors.forename: V T
authors.initials: VT
authors.lastname: Chu
authors.forename: O
authors.initials: O
authors.lastname: Pringault
authors.forename: D
authors.initials: D
authors.lastname: Amouroux
authors.forename: R
authors.initials: R
authors.lastname: Arfi
authors.forename: Y
authors.initials: Y
authors.lastname: Bettarel
authors.forename: T
authors.initials: T
authors.lastname: Bouvier
authors.forename: C
authors.initials: C
authors.lastname: Bouvier
authors.forename: P
authors.initials: P
authors.lastname: Got
authors.forename: T M H
authors.initials: TM
authors.lastname: Nguyen
authors.forename: X
authors.initials: X
authors.lastname: Mari
authors.forename: P
authors.initials: P
authors.lastname: Navarro
authors.forename: T N
authors.initials: TN
authors.lastname: Duong
authors.forename: T T T
authors.initials: TT
authors.lastname: Cao
authors.forename: T T
authors.initials: TT
authors.lastname: Pham
authors.forename: S
authors.initials: S
authors.lastname: Ouillon
authors.forename: J-P
authors.initials: JP
authors.lastname: Torréton
mesh_terms: D044822:Biodiversity; D002250:Carbon Radioisotopes / Q000032:analysis; D003710:Demography; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D005434:Flow Cytometry; D008628:Mercury / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis; D008767:Methylmercury Compounds / Q000032:analysis; D009792:Oceans and Seas; D010788:Photosynthesis / Q000502:physiology; D010839:Phytoplankton / Q000502:physiology*; D011157:Population Dynamics; D045483:Rivers; D054712:Salinity; D012621:Seasons; D014744:Vietnam
chemical_list: D002250:Carbon Radioisotopes; D019216:Metals, Heavy; D008767:Methylmercury Compounds; D008628:Mercury