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Auteur (up) Caillibotte, R.; Leredde, Y.; Vidussi, F.; Ulses, C.; Marsaleix, P.; Estourne, C.; Mostajir, B. doi  openurl
  Titre Impact of oysters as top predators on microbial food web dynamics: a modelling approach with parameter optimisation Type Article scientifique
  Année 2020 Publication Revue Abrégée Mar. Ecol.-Prog. Ser.  
  Volume 641 Numéro Pages 79-100  
  Mots-Clés Bacteria; bacterial-growth; biogeochemical fluxes; Biogeochemical modelling; carrying-capacity; coastal lagoon; crassostrea-gigas; Mesocosm; Microbial food web; mytilus-edulis; Oysters; Parameter optimisation; Phytoplankton; plankton communities; population-dynamics; thau lagoon mediterranee; trophic link; Zooplankton  
  Résumé Aquaculture is becoming a relevant and productive source of seafood, and production is expected to double in the near future. However, bivalve activities can significantly impact coastal ecosystem functioning. To study the direct and indirect impacts of oysters on the microbial food web, a OD biogeochemical modelling approach was adopted. The model was adjusted by parameter optimisation, assimilating data from several mesocosm observations of concentrations of nitrate, phosphate, silicate, dissolved organic carbon, chlorophyll, and bacterial biomass. The optimisation method provided a set of optimal parameters to fit the experimental observations of 'control' (i.e. natural water without oysters) and 'oyster' (i.e. natural water with oysters) mesocosms. The modelling results showed good accordance with the experimental observations, suggesting that the oysters directly reduced phytoplankton community biomass, thus constraining the ecosystem to a more heterotrophic state. Oysters also reduced competition between bacteria and phytoplankton for nutrient uptake, favouring higher bacterial biomass than in the control experiment. Additionally, the presence of oysters strongly increased large micro-zooplankton biomass (50-200 pm; mainly ciliates and large flagellates). This was a consequence of bacterivory by small zooplankton (5-50 mu m; mostly flagellates and small ciliates), providing a trophic link between bacteria and larger zooplankton. In conclusion, parameter optimisation showed good capacity to manage experimental data in order to build a more realistic model. Such models, in connection with future developments in aquaculture and global change scenarios, could be a promising tool for exploited ecosystem management and testing different environmental scenarios.  
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  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0171-8630 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000545928500006 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2838  
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