“…The dominance and higher abundance of P. ulvae suggest that this species may have a key role in this ecosystem. The number of species was higher compared with other lagoon systems, which usually have muddier sediments and higher organic matter contents (organically enriched areas) (Afli, Chakroun, Ayari, & Aissa, 2009;Chaouti & Bayed, 2008;Como & Magni, 2009;Kanaya et al, 2011;Khedhri, Atoui, Ibrahim, Afli, & Aleya, 2016;Magni et al, 2015Magni et al, , 2004Nanami et al, 2005;Rossi, Castelli, & Lardicci, 2006;Tounsi et al, 2018). However, the species number was still lower than that of the Merja Zerga lagoon in Morocco (Bazaïri, Bayed, Hily, & Glémarec, 2003) and the St. André lagoon in SW Portugal (Boaventura, Cancela da Fonseca, & Teles-Ferreira, 1999), and comparable to that of the Óbidos lagoon in Portugal (Carvalho et al, 2011) and the Santa Gilla lagoon in Italy (Cabiddu, Culurgioni, Palmas, Soldovilla, & Atzori, 2014).…”