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Multidisciplinary and multiscale approach to understand (harmful) phytoplankton dynamics in a NW Mediterranean bay

AuthorsBerdalet, Elisa ; Ross, Oliver N. ; Solé, Jordi ; Artigas, Mireia L. ; Llaveria, Gisela ; Llebot, Clara ; Quesada, R.; Piera, Jaume ; Estrada, Marta
Issue Date2010
PublisherInternational Council for the Exploration of the Sea
CitationICES Annual Science Conference (2010)
ICES CM Documents (2010)
AbstractThe mechanisms underlying the population dynamics of species causing Harmful Algal Blooms (HABs) are complex because they result from the interplay of a spectrum of physico-chemical and biological factors, to which the organisms respond with a variety of strategies. Still, it is not clear whether the responses of harmful species are different from other phytoplankters. In order to resolve some of these questions, we started a multidisciplinary study in 2007 in Alfacs Bay (Ebre Delta), an active aquaculture site in the NW Mediterranean that is exposed to recurrent HAB events. Through a series of meteorological and hydrographical observations combined with modelling exercises, we try to understand how the circulation in the Bay affects the retention, dispersion, and thus the net development of (harmful) phytoplankton populations. The small-scale characterization of the physical water column properties is performed using a highresolution acoustic Doppler current profiler and a SCAMP (temperature microstructure profiler to deliver information about turbulence). With this approach, we aim to explain the observed preferential vertical concentration of the target organisms (harmful or not). The field studies are complemented by physiological research in the laboratory which has already shown a particular sensitivity of dinoflagellates to small-scale turbulence. For hypothesis testing, we combine these field and laboratory observations with an individual based (Lagrangian) turbulence model. Here, we present some of our progress and highlight our future goals which includes the deployment of a real-time automated physico-optical observation system to provide a better understanding of the in situ biological (growth and grazing rate) dynamics of (harmful) phytoplankton
DescriptionICES Annual Science Conference 20-24 September 2010 Nantes, France.-- 6 pages, 5 figures
Publisher version (URL)http://www.ices.dk/products/CMdocs/CM-2010/N/N0210.pdf
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