Pinna nobilis are efficient filter feeders bivalves and provide evidence of surrounding conditions. Individuals of a Marine Protected Area (MPA) have been sampled and isotopic values of δ13C and δ15N have been analyzed to study the annual cycle of the fan mussel in non-eutrophic waters. Values obtained in summer months are higher indicating the need to consider temporal shifts in stable isotope linked with trophic resources availabilit
