title: Significant Change in Marine Plankton Structure and Carbon Production After the Addition of River Water in a Mesocosm Experiment.
abstract: Rivers are known to be major contributors to eutrophication in marine coastal waters, but little is known on the short-term impact of freshwater surges on the structure and functioning of the marine plankton community. The effect of adding river water, reducing the salinity by 15 and 30%, on an autumn plankton community in a Mediterranean coastal lagoon (Thau Lagoon, France) was determined during a 6-day mesocosm experiment. Adding river water brought not only nutrients but also chlorophyceans that did not survive in the brackish mesocosm waters. The addition of water led to initial increases (days 1-2) in bacterial production as well as increases in the abundances of bacterioplankton and picoeukaryotes. After day 3, the increases were more significant for diatoms and dinoflagellates that were already present in the Thau Lagoon water (mainly Pseudo-nitzschia spp. group delicatissima and Prorocentrum triestinum) and other larger organisms (tintinnids, rotifers). At the same time, the abundances of bacterioplankton, cyanobacteria, and picoeukaryote fell, some nutrients (NH4+, SiO43-) returned to pre-input levels, and the plankton structure moved from a trophic food web based on secondary production to the accumulation of primary producers in the mesocosms with added river water. Our results also show that, after freshwater inputs, there is rapid emergence of plankton species that are potentially harmful to living organisms. This suggests that flash flood events may lead to sanitary issues, other than pathogens, in exploited marine areas.
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France. eric.fouilland@cnrs.fr.
authors.forename: E
authors.initials: E
authors.lastname: Fouilland
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.|DHI Water & Environment (S) Pte Ltd, 1 Cleantech loop #03-05 Clean Tech One, Singapore, 637141, Singapore.
authors.forename: A
authors.initials: A
authors.lastname: Trottet
authors.affiliation: Sorbonne Universités, Université Pierre et Marie Curie - Paris 6, CNRS, UMR 7144, Station Biologique de Roscoff, Place Georges Teissier, CS90074, 29688, Roscoff cedex, France.|Laboratório de Ficologia, Departamento de Botânica, Museu Nacional/Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, s/n, São Cristovão, Rio de Janeiro, RJ, 20940-040, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Alves-de-Souza
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: D
authors.initials: D
authors.lastname: Bonnet
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: T
authors.initials: T
authors.lastname: Bouvier
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: M
authors.initials: M
authors.lastname: Bouvy
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: S
authors.initials: S
authors.lastname: Boyer
authors.affiliation: Sorbonne Universités, Université Pierre et Marie Curie - Paris 6, CNRS, UMR 7144, Station Biologique de Roscoff, Place Georges Teissier, CS90074, 29688, Roscoff cedex, France.
authors.forename: L
authors.initials: L
authors.lastname: Guillou
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: E
authors.initials: E
authors.lastname: Hatey
authors.affiliation: Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: H
authors.initials: H
authors.lastname: Jing
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: C
authors.initials: C
authors.lastname: Leboulanger
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: E
authors.initials: E
authors.lastname: Le Floc'h
authors.affiliation: Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.affiliation: UMS 3301Centre d'écologie marine expérimentale MEDIMEER, Université de Montpellier, CNRS, Station Marine, 2 rue des Chantiers, 34200, Sète, France.
authors.forename: S
authors.initials: S
authors.lastname: Mas
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: B
authors.initials: B
authors.lastname: Mostajir
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: J
authors.initials: J
authors.lastname: Nouguier
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: D
authors.initials: D
authors.lastname: Pecqueur
authors.affiliation: UMR 7618 iEES-Paris (IRD-UPMC-CNRS-INRA-UDD-UPEC), UPMC, case 237, 4 place Jussieu, 75252, Paris cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Rochelle-Newall
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: C
authors.initials: C
authors.lastname: Roques
authors.affiliation: UMR 5569 Laboratoire HydroSciences (CNRS, IRD, UM), Université de Montpellier, case courrier 057, 34095, Montpellier cedex 5, France.
authors.forename: C
authors.initials: C
authors.lastname: Salles
authors.affiliation: UMR 5569 Laboratoire HydroSciences (CNRS, IRD, UM), Université de Montpellier, case courrier 057, 34095, Montpellier cedex 5, France.
authors.forename: M-G
authors.initials: MG
authors.lastname: Tournoud
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.|LOV-UPMC-CNRS, UMR 7093, Station zoologique, BP 28 06234, Villefranche-sur-mer, France.
authors.forename: C
authors.initials: C
authors.lastname: Vasseur
authors.affiliation: UMR 9190 MARBEC Marine Biodiversity, Exploitation and Conservation, CNRS, IRD, IFREMER, Université de Montpellier, Montpellier & Sète, France.
authors.forename: F
authors.initials: F
authors.lastname: Vidussi
mesh_terms: D000818:Animals; D001419:Bacteria; D002244:Carbon / Q000737:chemistry*; D020387:Food Chain; D005602:France; D005618:Fresh Water; D010933:Plankton; D045483:Rivers / Q000737:chemistry*; D012403:Rotifera; D054712:Salinity
chemical_list: D002244:Carbon
keywords: Coastal ecosystems; Flood impact; Planktonic food web; Potentially harmful species