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Species composition and spatial variability inside algal turf communities within territories of the damselfish  Stegastes nigricans  have been studied in a shallow reef flat environment of the Saint Gilles-La Saline reef complex, at La Réunion Island. The sampling of 50 small portions (2 cm long) of staghorn coral  Acropora  branches and accurate identification and quantification of algal species under a dissecting microscope provided a list of 19 species. Green algae  Enteromorpha clathrata  and  Cladophora socialis  and red algae  Anotrichium tenue  and  Gelidiopsis intricata  were the most abundant species in the turfs overgrowing  Acropora  coral branches. A correspondence analysis applied to the samples revealed three major groups of species characterised by (1)  Enteromorpha clathrata , (2)  Cladophora socialis , and (3)  Gelidiopsis intricata . A gradient has been observed from  Enteromorpha clathrata  turfs usually occurring at the apical parts of the coral branches, to  Gelidiopsis intricata  turfs present at the basal parts of the branches. The algal composition of the gut contents of  Stegastes nigricans  was analysed and compared to the algal composition in the field. The feeding selectivity of the fish was established for several algal species. We suggest that  Enteromorpha clathrata -dominated turfs correspond to initial aspects of algal colonisation of recently dead corals, while  Gelidiopsis intricata -dominated turfs correspond to mature communities;  Cladophora socialis -dominated turfs would correspond to the most intensively grazed turfs.

Microspatial Variability Inside Epilithic Algal Communities within Territories of the Damselfish Stegastes nigricans at La Réunion (Indian Ocean)