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Climate Variability and Oceanographic Settings Associated with Interannual Variability in the Initiation of Dinophysis acuminata Blooms
Spanish Institute of Oceanography (IEO), Oceanographic Centre of Vigo, Subida a Radiofaro 50, Vigo 36390, Spain
Spanish Institute of Oceanography (IEO), Oceanographic Centre of A Coruña, Muelle de las Ánimas s/n, A Coruña 15001, Spain
Technological Centre for the Control of the Marine Environment of Galicia (INTECMAR), Peirao de Vilaxoán s/n, Vilagarcía de Arousa 36611, Pontevedra, Spain
French Research Institute for the Exploitation of the Sea (IFREMER), Brest Centre, Pointe du Diable BP 70, Plouzané 29280, France
Permanent address: Fisheries Research Programme & Aquaculture Institute, Austral University of Chile, Los Pinos s/n, Balneario Pelluco, Puerto Montt 5480000, Chile.
* Author to whom correspondence should be addressed.
Received: 16 July 2013; in revised form: 2 August 2013 / Accepted: 5 August 2013 / Published: 16 August 2013
Abstract: In 2012, there were exceptional blooms of D. acuminata in early spring in what appeared to be a mesoscale event affecting Western Iberia and the Bay of Biscay. The objective of this work was to identify common climatic patterns to explain the observed anomalies in two important aquaculture sites, the Galician Rías Baixas (NW Spain) and Arcachon Bay (SW France). Here, we examine climate variability through physical-biological couplings, Sea Surface Temperature (SST) anomalies and time of initiation of the upwelling season and its intensity over several decades. In 2012, the mesoscale features common to the two sites were positive anomalies in SST and unusual wind patterns. These led to an atypical predominance of upwelling in winter in the Galician Rías, and increased haline stratification associated with a southward advection of the Gironde plume in Arcachon Bay. Both scenarios promoted an early phytoplankton growth season and increased stability that enhanced D. acuminata growth. Therefore, a common climate anomaly caused exceptional blooms of D. acuminata in two distant regions through different triggering mechanisms. These results increase our capability to predict intense diarrhetic shellfish poisoning outbreaks in the early spring from observations in the preceding winter.
Keywords: Dinophysis acuminata; climate variability; upwelling patterns; river plumes; exceptional algal blooms; predictive models
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Díaz, P.A.; Reguera, B.; Ruiz-Villarreal, M.; Pazos, Y.; Velo-Suárez, L.; Berger, H.; Sourisseau, M. Climate Variability and Oceanographic Settings Associated with Interannual Variability in the Initiation of Dinophysis acuminata Blooms. Mar. Drugs 2013, 11, 2964-2981.
Díaz PA, Reguera B, Ruiz-Villarreal M, Pazos Y, Velo-Suárez L, Berger H, Sourisseau M. Climate Variability and Oceanographic Settings Associated with Interannual Variability in the Initiation of Dinophysis acuminata Blooms. Marine Drugs. 2013; 11(8):2964-2981.
Díaz, Patricio A.; Reguera, Beatriz; Ruiz-Villarreal, Manuel; Pazos, Yolanda; Velo-Suárez, Lourdes; Berger, Henrick; Sourisseau, Marc. 2013. "Climate Variability and Oceanographic Settings Associated with Interannual Variability in the Initiation of Dinophysis acuminata Blooms." Mar. Drugs 11, no. 8: 2964-2981.