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Interannual variability in Ostreopsis ovata bloom dynamic along Genoa coast (North-western Mediterranean): a preliminary modeling approach

Valentina ASNAGHI, Rosella BERTOLOTTO, Valentina GIUSSANI, Luisa MANGIALAJO, Judi HEWITT, Simon THRUSH, Paolo MORETTO, Michela CASTELLANO, Anna ROSSI, Paolo POVERO, Riccardo CATTANEO-VIETTI & Mariachiara CHIANTORE

en Cryptogamie, Algologie 33 (2) - Pages 181-189

Published on 25 May 2012

The tropical genus Ostreopsis has been recorded along Italian coasts of the Mediterranean Sea since the `90s, but large bloom events have been reported only in recent years. In order to describe O. ovata bloom dynamics and provide a better understanding of environmental variables involved in triggering blooms, we collected a time series of data in Genoa (North Western Mediterranean) from 2006 to 2010. Cell abundances in the water column and epiphyte on the macroalgae were assessed during the summer months. Water and meteorological variables were concurrently collected.
We elaborated a meaningful explanatory model, performing multiple correlations between bloom magnitude (maximum cell concentration) and length (extent of the bloom event) and water/meteorological features. Such a model highlights a significant role of water temperature, barometric pressure and wind speed in affecting bloom dynamics. It represents a good base for managers in the attempt of forecasting O. ovata blooms and, specifically, toxic events, in an ecological, economic and sanitary perspective.


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