Laboratory“Aliments Environnement et santé” Faculty of Sciences and Technics B.P.549 Cadi Ayyad University Marrakech 40000 Morocco;
Mer Molécules Santé Department of Biology Environment Faculty of Sciences UCO Angers 49008 France;
Marine Biological Association the Laboratory Citadel Hill Plymouth PL12PB United Kingdom;
Department of Biology Ecole Normale Supérieure B.P.2400 Cadi Ayyad University Marrakech 40000 Morocco;
polychaetes; taxonomic; diversity; Essaouira; rocky; shore; faunal; assemblage;