Nutrient ratios influence variability in Pseudo-nitzschia species diversity and particulate domoic acid production in the Bay of Seine (France) |
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| Institution: | 1. Normandie Univ, UNICAEN, CNRS, BOREA, 14000 Caen, France;2. UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UCBN, 14032 Caen, France;3. CMAbio-SF 4206 ICORE UNICAEN, 14032 Caen, France;4. Ifremer, LER/N, 14520 Port en Bessin, France;5. LABEO Frank Duncombe, Saint-Contest, 14053 Caen Cedex, France;1. IFREMER, REM-EEP-LEP, BP 70, 29280 Plouzané, France;2. Station Biologique de Roscoff (Roscoff Marine Station)- Place Georges Teissier, 29680 Roscoff, France & Centre Ifremer de Brest - Pointe du Diable, 29280 Plouzané, France;3. IFREMER, Unité de Recherche Lagons, Ecosystèmes et Aquaculture Durable (LEAD-NC), BP 2059, Nouméa 98846, New Caledonia, France;4. IFREMER, LER/N, Avenue du Général de Gaulle, 14520 Port en Bessin, France;5. IFREMER, Dyneco/PELAGOS, BP 70, 29280 Plouzané, France;1. Ifremer, DYNECO PELAGOS, F-29280 Plouzané, France;2. IFREMER, Station de Biologie Marine, Place de la Croix, BP 40537, F-29185 Concarneau Cedex, France;3. Normandie University, UNICAEN, 14000 Caen, France;4. UMR BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UCBN, 14032 Caen, France;1. Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Science, South China Normal University, 55 of Zhongshan West Avenue, Guangzhou 510631, PR China;2. Guangdong Provincial key Laboratory of Healthy and Safe Aquaculture, College of Life Science, South China Normal University, 55 of Zhongshan West Avenue, Guangzhou 510631, PR China;3. Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83S, Copenhagen, Denmark;4. Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan 94300, Malaysia;5. Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture; Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, PR China;1. Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83S, DK-1307 Copenhagen K, Denmark;2. National Institute of Aquatic Resources, DTU Aqua, Section for Oceanecology and Climate, Technical University of Denmark, DTU, Kavalergården 6, DK-2920 Charlottenlund, Denmark;3. Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland;4. Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung, Ökologische Chemie, Am Handelshafen 12, 27570 Bremerhaven, Germany;5. Department of Bioscience, Roskilde, Aarhus University, Frederiksborgvej 399, PO Box 358, 4000 Roskilde, Denmark |
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| Abstract: | The population dynamics of different Pseudo-nitzschia species, along with particulate domoic acid (pDA) concentrations, were studied from May 2012 to December 2013 in the Bay of Seine (English Channel, Normandy). While Pseudo-nitzschia spp. blooms occurred during the two years of study, Pseudo-nitzschia species diversity and particulate domoic acid concentrations varied greatly. In 2012, three different species were identified during the spring bloom (P. australis, P. pungens and P. fraudulenta) with high pDA concentrations (∼1400 ng l−1) resulting in shellfish harvesting closures. In contrast, the 2013 spring was characterised by a P. delicatissima bloom without any toxic event. Above all, the results show that high pDA concentrations coincided with the presence of P. australis and with potential silicate limitation (Si:N < 1), while nitrate concentrations were still replete. The contrasting environmental conditions between 2012 and 2013 highlight different environmental controls that might favour the development of either P. delicatissima or P. australis. This study points to the key role of Pseudo-nitzschia diversity and cellular toxicity in the control of particulate domoic acid variations and highlights the fact that diversity and toxicity are influenced by nutrients, especially nutrient ratios. |
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| Keywords: | Species diversity Domoic acid English channel Bloom dynamics Nutrient ratios |
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