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Pre-print Volume – Posters Topic 3: INTEGRATED COASTAL ZONE MANAGEMENT Results – Both the investigated sites highlighted a seasonal trend according to the O. ovata occurrence. The species was found during October 2007 and from June to September 2008 in the sampling station named “Giovinazzo-Riva del Sole”, the abundance ranging from 6.400 to 1.945.600 cell/l in the in the bottom water samples. In the station named “Torre a Mare-ex Motel Agip”, O. ovata was recorded during October-November 2007 and from July to September 2008, the abundance ranging from 320 to 2.496.000 cell/l. The peaks of abundance were recorded in the August- September period in both the sites, when values ranged between 2.000.000 and 2.500.000 cell/l. Very low abundance values were recorded in the months of October and November, while no findings were reported in the period December 2007-May 2008. The species abundance and the chemical-physical parameters measured data were analyzed using univariate statistical approach (correlation matrix, Spearman coefficient). Results from the statistical analysis highlighted a significant (α=0.05) positive correlation among O. ovata abundance and water temperature (0.66) (Fig. 2), conductivity (0.52), pH (0.45), a-chlorophyll (0.45), N-NO3/N-NO2 ratio (0.41), N- NO3/N-NH4 ratio (0.41), while negative correlation with N-NO2 (-0.51). No significant correlation was found among O. ovata abundance and N-NH4, N-NO3, N-tot., P-PO4, P-tot., SiO2. Conclusions – The preliminary results highlighted a well defined annual trend of the O. ovata population in both the sites, with peaks of abundance in the summer-autumn months and the depletion in the winter-spring period. Potential relationships among the dinoflagellate occurrence and the water quality parameters came from the correlation study. The seasonal variation of some chemical-physical parameters (i.e. increase of water temperature) can be assumed as the main driver for the presence and abundance of O. ovata, although it needs to be better investigated by an appropriate and more extensive monitoring programme. References CIMINIELLO P., DELL’AVERSANO C., FATTORUSSO E., FORINO M., TARTAGLIONE L., GRILLO C., MELCHIORRE N. (2008) - Putative palytoxin and its new analogue, ovatoxin-a, in Ostreopsis ovata collected along the Ligurian coasts during the 2006 toxic outbreak. J. Amer. Soc. Mass Spec., 19: 111-120. CONGESTRI R., PENNA A., ZINGONE A. (2006) - BENTOX-NET, a Research and management initiative on Ostreopsis spp. an other benthic microalgal blooms on the Italian coast. Harmful Algae News, 32: 11-12. GALLITELLI M., UNGARO N, ADDANTE L.M, GENTILONI N., SABBÀ C. (2005) - Respiratory illness as a reaction to tropical algal blooms occurring in a temperate climate. JAMA, 239: 2599- 2600. YASUMOTO T., SEINO N., MURAKAMI Y., MURATA M. (1987) - Toxins produced by benthic dinoflagellates. Biol. Bull., 172: 128-31. UNGARO N., PASTORELLI A.M., BLONDA M., ASSENNATO G. (2008) - Il monitoraggio di sorveglianza delle fioriture di Ostreopsis ovata nei Mari Pugliesi: approccio metodologico e risultati nella stagione estiva 2007. Biol. Mar. Mediterr., 15 (1): 62-64. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 191
Topic 4 / Tema 4 Pre-print Volume Topic 4: THE ELASMOBRANCHS THE ELASMOBRANCHS GLI ELASMOBRANCHI 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 192
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