title: Dynamics of phytoplankton communities in eutrophying tropical shrimp ponds affected by vibriosis.
abstract: Tropical shrimp aquaculture systems in New Caledonia regularly face major crises resulting from outbreaks of Vibrio infections. Ponds are highly dynamic and challenging environments and display a wide range of trophic conditions. In farms affected by vibriosis, phytoplankton biomass and composition are highly variable. These conditions may promote the development of harmful algae increasing shrimp susceptibility to bacterial infections. Phytoplankton compartment before and during mortality outbreaks was monitored at a shrimp farm that has been regularly and highly impacted by these diseases. Combining information from flow cytometry, microscopy, pigment and phylogenetic analysis, the presence of Picocyanobacteria, Prasinophyceae and Diatomophyceae were detected as dominant phytoplankton groups and Cryptophyceae, Prymnesiophyceae and Dinophyceae as minor components. At the onset of the first shrimp mortalities, Bacillariophyceae increased while Cyanobacteria, Prymnesiophyceae and Dinophyceae decreased in the water column, followed by proliferation of Prasinophyceae. Several taxa were identified as potential harmful algae (Cyanobacteria, dinoflagellates and Phaeocystis).
authors.affiliation: IFREMER LEAD, BP 2059, 98846 Nouméa cedex, New Caledonia, France. Electronic address: hugues.lemonnier@ifremer.fr.
authors.forename: Hugues
authors.initials: H
authors.lastname: Lemonnier
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire Océanologique, F-66650 Banyuls/mer, France.
authors.forename: François
authors.initials: F
authors.lastname: Lantoine
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire Océanologique, F-66650 Banyuls/mer, France.
authors.forename: Claude
authors.initials: C
authors.lastname: Courties
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire Océanologique, F-66650 Banyuls/mer, France; Microbia Environnement, Observatoire Océanologique de Banyuls, 66650 Banyuls-sur mer, France.
authors.forename: Delphine
authors.initials: D
authors.lastname: Guillebault
authors.affiliation: IFREMER, LER BO, Station de Biologie Marine, Place de la Croix, BP 40537, 29185 Concarneau Cedex, France.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Nézan
authors.affiliation: IFREMER, LER BO, Station de Biologie Marine, Place de la Croix, BP 40537, 29185 Concarneau Cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Chomérat
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Plate-forme Bio2Mar, Observatoire Océanologique, F-66650 Banyuls/Mer, France.
authors.forename: Karine
authors.initials: K
authors.lastname: Escoubeyrou
authors.affiliation: GFA, Groupement des Fermes Aquacoles, ORPHELINAT, 1 rue Dame Lechanteur, 98800 Nouméa cedex, New Caledonia, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Galinié
authors.affiliation: GFA, Groupement des Fermes Aquacoles, ORPHELINAT, 1 rue Dame Lechanteur, 98800 Nouméa cedex, New Caledonia, France.
authors.forename: Bernard
authors.initials: B
authors.lastname: Blockmans
authors.affiliation: IFREMER LEAD, BP 2059, 98846 Nouméa cedex, New Caledonia, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Laugier
mesh_terms: D000818:Animals; D017756:Aquaculture; D001419:Bacteria / Q000235:genetics; D000458:Cyanobacteria / Q000235:genetics / Q000502:physiology; D017377:Diatoms / Q000502:physiology; D005068:Eutrophication; D009510:New Caledonia; D033561:Penaeidae / Q000382:microbiology*; D010802:Phylogeny; D010839:Phytoplankton; D061005:Ponds; D014329:Tropical Climate; D014735:Vibrio Infections / Q000401:mortality / Q000662:veterinary*
keywords: Eutrophication; Harmful algae; Litopenaeus stylirostris; Phytoplankton; Tropical aquaculture pond; Vibriosis