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Is Alfacs Bay a phytoplankton bloom incubator?
|Authors:||Berdalet, Elisa ; Artigas, Mireia L. ; Llebot, Clara ; Ross, Oliver N. ; Neszi, Norma Z. ; Piera, Jaume ; Estrada, Marta|
|Citation:||15th International Conference on Harmful Algae (2012)|
|Abstract:||Understanding the spatio-temporal variability of phytoplankton in aquaculture areas is necessary for the appropriate management of natural resources and prevention of noxious outbreaks. With this objective, we combined synoptic cruises, time series of physical parameters and modeling in Alfacs Bay, a microtidal estuary of the NW Mediterranean. This important shellfish and fish productive area is commonly affected by toxic outbreaks. Synoptic cruises performed during relevant harmful species proliferations showed the existence of a preferential accumulation area in the NE side of the Bay. This trend can be in part explained by the nutrient supply through the irrigation channels in the Northern coast. Furthermore, using a 3D hydrodynamic model (see details in Estrada et al., this conference) combined with a particle tracking module, we suggest that the phytoplankton confinement in that area would be fostered by the estuarine circulation dynamics operating within the particular geomorphological characteristics of the bay. This confinement is observed during most part of the year. At small-scale, high daily and rhythmic variations of phytoplankton biomass were observed using a continuous fluorescence sensor deployed in the center of the Bay, near the mussel rafts. The variability was specially linked to the complex circulation dynamics including advection and dispersal of the populations accumulated in the inner part of the Bay. Altogether, these results will contribute to track the dynamics of noxious phytoplankton organisms|
|Description:||15th International Conference on Harmful Algae (ICHA), 29 October - 2 November 2012, Changwon Gyeongnam, Korea|
|Publisher version (URL):||http://www.hab2012.kr/page?id=eng_index|
|Appears in Collections:||(ICM) Comunicaciones congresos|
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