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The article focuses on the impact of the selective removal of the brown alga Cystoseira compressa and the mussel Mytilus galloprovincialis to the number and identity of habitat-forming species (HFSs) on assemblages of algae and invertebrates on rocky shores in north-western Mediterranean. The study uses the experimental design to effectively sort out the richness and identities of the species as well as to control the variation of its abundance. It notes that the direction and extent of effects is dependent in the abundance of species. It focuses how the simultaneous loss of two HFSs affects the assemblages, emphasizes the value of analyzing the non-random loss of species, and asserts the need to insure density-dependent outcomes in biodiversity studies.