Two decades of Pseudo-nitzschia spp. blooms and king scallop (Pecten maximus) contamination by domoic acid along the French Atlantic and English Channel coasts: Seasonal dynamics, spatial heterogeneity and interannual variability
|Author(s)||Husson Berengere1, Hernandez Farinas Tania2, 3, Le Gendre Romain4, Schapira Mathilde5, Chapelle Annie6|
|Affiliation(s)||1 : IFREMER, REM EEP LEP, BP 70, F-29280 Plouzane, France.
2 : Roscoff Marine Stn, Stn Biol Roscoff, Pl Georges Teissier, F-29680 Roscoff, France.
3 : Ctr Ifremer Brest Pointe Diable, F-29280 Plouzane, France.
4 : IFREMER, Unite Rech Lagons Ecosyst & Aquaculture Durable L, BP 2059, Noumea 98846, New Caledonia.
5 : IFREMER, LER N, Ave Gen Gaulle, F-14520 Port En Bessin, France.
6 : IFREMER, Dyneco PELAGOS, BP 70, F-29280 Plouzane, France.
|Source||Harmful Algae (1568-9883) (Elsevier Science Bv), 2016-01 , Vol. 51 , P. 26-39|
|WOS© Times Cited||34|
|Keyword(s)||Pseudo-nitzschia spp., Domoic acid, King scallop, Interannual variability, Seasonal dynamics, Environmental parameters|
|Abstract||King scallop contamination (Pecten maximus) by domoic acid, a neurotoxin produced by some species of the diatom Pseudo-nitzschia, is highly problematic because of its lengthy retention in the bivalve tissue, leading to prolonged fishery closures. Data collected within the French Phytoplankton and Phycotoxin monitoring network (REPHY) over the 1995–2012 period were used to characterize the seasonal dynamics and the interannual variability of P.-nitzschia spp. blooms as well as the contamination of king scallop fishing grounds, in six contrasted bays distributed along the French Atlantic coast and English Channel. Monitoring revealed that these toxic events have become more frequent since the year 2000, but with varying magnitudes, frequencies and timing depending on the bay. Two bays, located in southern Brittany, exhibited both recurrent contaminations and high P.-nitzschia abundances. The Brest bay and the Seine bay were intermittently affected. The Pertuis Breton exhibited only one major toxic event related to an exceptionally intense bloom of P.-nitzschia in 2010, and the Saint Brieuc bay neither showed significant contamination nor high P.-nitzschia abundance. While high P.-nitzschia abundance appeared to be correlated to scallop toxicity, this study highlights the difficulty in linking P.-nitzschia spp. blooms to king scallop contamination through monitoring. Indeed, P.-nitzschia was determined at the genus level and data regarding species abundances and their toxicity levels are an absolute prerequisite to further assess the environmental control of ASP events. As results describe distinct P.-nitzschia bloom dynamics along the French coast, this may suggest distinct controlling factors. They also revealed that major climatic events, such as the winter storm Xynthia in 2010, can trigger toxicity in P.-nitzschia over a large spatial scale and impact king scallop fisheries all along the coast.|