The Western Algerian islands (Rachgoun, Habibas and Plane) are sites of high ecological value taking into account the number of endemic and endangered marine species from Mediterranean that are living there. In this sense, important populations of the endangered mollusc Patella ferruginea have been recorded in Rachgoun and Habibas islands.The intertidal ecosystems of Habibas and Plane islands are wellpreserved and are greatly structured. The populations of Patella ferruginea in Algerian islands are very dense, reproductive, well structured and represent a hot spot in the Mediterranean.
Their preservation is essential for the viability of the species at global scale and it makes necessary to develop appropriate conservation and management measures. In this sense, a monitoring programme needs to be implemented in the upcoming years together with a strict ban of collecting. Additionally, a plan of emergency about oil8 spills needs to be developed to avoid catastrophic events.
Differences found between Habibas and Plane islands make to ask about the requirement for establishing a marine reserve in Plane island. Nevertheless, it would be necessary to undertake more specific studies in Plane island in order to know the conservational status of the environment.