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Pre-print Volume - Posters BENTHOS COMMITEE Tab. 1 – C. taylorii densities in the two analysed subsamples (SS) of each sample (S) collected in the seventeen study sites. Densità di C. taylorii nei due subcampioni (SS) analizzati di ciascun campione (S) raccolto nei diciassette siti di campionamento. C. taylorii densities (cells cm -2 ) S1 S2 Study site SS1 SS2 SS1 SS2 Moneta 98251 98134 98511 98476 Cala Coticcio 34072 34105 33892 33929 Santo Stefano - - - - Porto Palma 943 961 902 913 Isola delle Bisce 3497 3484 3521 3539 Li Nibari 21978 21956 21991 21971 Scoglio dei poveri 6310 6286 6234 6335 Mortorio 34822 34846 34986 34932 Marinella 58212 58236 58148 58364 Sos Aranzos 77983 77948 77895 77921 Porto San Paolo 6732 6751 6521 6601 Porto Ottiolu 80104 80158 79821 80095 La Caletta - - - - Capo Comino - - - - Cala Gonone 91 85 78 86 Cala Luna 411 427 459 442 Isolotto Ogliastra - - - - The performed two way ANOVA showed statistically significant differences in the microalgae cell densities both between samples (ANOVA, F17,34=6.5 P
Pre-print Volume - Posters BENTHOS COMMITEE S. CARONNI, A. NAVONE * Dip.to di Ecologia del Territorio, Sezione di Ecologia, Via S.Epifanio, 14 - 27100 Pavia, Italia. sarah.caronni@unipv.it * Area Marina Protetta di Tavolara-Punta Coda Cavallo, Olbia, Italia. DENSITY AND SIZE OF THE FAN MUSSEL PINNA NOBILIS (LINNEO, 1758) IN TWO DIFFERENTLY PROTECTED ZONES OF TAVOLARA-PUNTA CODA CAVALLO MARINE PROTECTED AREA DENSITÀ E TAGLIA DEL BIVALVE PINNA NOBILIS (LINNEO, 1758) IN DUE ZONE DIVERSAMENTE PROTETTE DELL’AMP DI TAVOLARA-PUNTA CODA CAVALLO Abstract – In the summer months of 2009 the abundance and the total shell size of the endangered bivalve Pinna nobilis (Linneus, 1758) (Mollusca: Bivalvia) were investigated in a partial reserve zone and in a general reserve one of the marine protected area of Tavolara-Punta Coda Cavallo (N-E Sardinia) in order to assess the usefulness of stricter environmental protection. Key-words: environmental protection, marine parks, rare species, marine molluscs, density. Introduction – During the last decades the population of Pinna nobilis (Linneo, 1758), the largest Mediterranean bivalve, has been consistently declining (Vicente and Moreteau, 1991) as a result of collection by divers (Zavodnik et al., 1991) and incidental killing by trawling and anchoring (Centoducati et al., 2007). Consequently this fan mussel has been listed as an endangered species and is nowadays under protection, according to the European Council Directive 92/43/EEC. The aim of this work is to improve the knowledge on the distribution of P. nobilis in the Tavolara- Punta Coda Cavallo Marine Protected Area and to verify if stricter protection rules positively affect the density and the size of this species. Materials and methods – Two areas of approximately 500 m 2 near Molara and Isolotto Rosso islands, situated respectively in a partial reserve zone (B) and in a general reserve (C) one, were chosen for the study because of substrate similarities. In each site a 100 m long transect line was drown from the shore perpendicularly to the shoreline (Šiletić and Peharda, 2003) and all bivalves in two 2,50 m corridors on either side of the transect line were recorded. For each specimen the unburied length and the width at sediment level were measured with a multi-calliper similar to the one proposed by García-March et al. (2002) and total shell lengths were estimated with García-March and Ferrer’s equation (1995). Statistical analyses (MINITAB Student Release 12) allow the comparison between the recorded specimens in the two sites. Results – In both study sites P. nobilis specimens were found on sandy and cobbled substrates, in particular among sea grass Posidonia oceanica (L.) Delile patches. In the summer months of 2009, 29 bivalves were totally counted in the study area; 11 along the transect near Isolotto Rosso island (RI) and 18 along the one near Molara island (MI). Data about density and total shell length of specimens along the two transects are shown in Tab. 1. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 268
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