期刊
HARMFUL ALGAE
卷 68, 期 -, 页码 192-205出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hal.2017.07.005
关键词
Pseudo-nilzschia; Species diversity; Domoic acid; English channel; Bloom dynamics; Nutrient ratios
资金
- TAPAS (Agence de l'eau Seine Normandie - Fonds Europeens pour la Peche) programme
- FLAM (Agence de l'eau Seine Normandie - programme LITEAU, Ministere de l'Environnement, de l'Energie et de la Mer) programme
- Ministere de la Recherche et de l'Enseignement Superieur
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 (similar to 1400 ngl(-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. (C) 2017 Elsevier B.V. All rights reserved.
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