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TURECOTOX and ECOALFACS Projects: Contributions of two GEOHAB Endorsed Projects

AuthorsBerdalet, Elisa ; Arin, Laura ; Artigas, Mireia L. ; Blasco, Dolors ; Estrada, Marta ; Llaveria, Gisela ; Neszi, Norma Z. ; Quesada, R.; Ross, Oliver N. ; Solé, Jordi ; Reguera, B.
Issue DateOct-2014
CitationGEOHAB 2014. Global Ecology and Oceanography of Harmful Algal Blooms, GEOHAB Synthesis Open Science Meeting: 37 (2014)
GEOHAB Report 12: 37 (2014)
AbstractFrom 2009 to 2013, the TURECOTOX (CTM2006-13884-C02-00/MAR) and ECOALFACS (CTM2009- 09581) projects, endorsed by GEOHAB, focused on the interactions between small-scale turbulence and the biology of toxigenic dinoflagellates (toxin-producing HABs). Research included ecophysiological experiments and fieldwork in two contrasting areas: the Galician Rías Baixas (upwelling systems, Atlantic coast) and the microtidal estuary of Alfacs bay in the Ebro Delta (coastal embayment, stratified system, Mediterranean Sea). Laboratory experiments with cultures showed how small-scale turbulence can modulate different ecophysiological processes including growth rate, cell cycle patterns, asexual encystment, nucleic acids, toxin and DMSP cell quota and infection by parasites. However, the cellular mechanisms underlying the observed responses are still unknown. In the Rías, the population dynamics (division rate, viability, mortality) of Dinophysis spp. and their behavior (vertical migration, mixotrophy) were studied with the same spatio-temporal scale than the finescale hydrodynamical processes (water velocities, shear, vertical diffusion, turbulence). For the first time, data on the formation, maintenance and dissipation of thin layers of Pseudo-nitzschia spp. were obtained in this area. In Alfacs bay, several modeling approaches (3D hydrodynamic model combined with a Lagrangian particle-tracking module) validated by continuous records of physical and meteorological data have been implemented to understand how the complex circulation dynamics may facilitate water retention and thus phytoplankton biomass accumulation in the inner part of the bay. We hope that most undergoing efforts will improve the understanding of the link between physical dynamics and biological and ecological processes (growth, mortality, migration) of selected HAB taxa and/or functional groups in the bay
DescriptionBerdalet, Elisa ... et. al.-- Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) Synthesis Open Science Meeting, 24-26 April 2013, Paris, France
Publisher version (URL)http://hab.ioc-unesco.org/index.php?option=com_oe&task=viewDocumentRecord&docID=14272
Identifiersissn: 1538-182X
Appears in Collections:(ICM) Comunicaciones congresos
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