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L'espace maritime du Senegal est tres vaste et renferme une riche biodiversite algale. Malgre cette grande etendue d'eau, ces macroalgues marines sont encore peu connues dans ce pays. Ce travail constitue une etude de la flore de macroalgues de trois sites marins de DAKAR. Elle a ete entreprise pour connaitre la diversite specifique, determiner la structure de la flore (spectre taxonomique) et sa repartition par rapport a ces trois sites. Durant cette etude, des macroalgues ont ete inventoriees, identifiees puis classees. Les resultats indiquent que cette flore est constituee de 21 taxons repartis dans 13 genres, 11 familles et 3 classes. Les classes des Ulvophyceae et des Florideophyceae sont les plus representees, concentrant chacune 38,09% des especes rencontrees, suivies de celle des Phaeophyceae avec 23,8% des especes rencontrees. Cette etude a montre que la zone du PNIM (Parc National des Iles de la Madeleine) est plus riche en especes avec 16 especes (55,1%), suivie de la zone de Terrou-bi avec 11 especes (37,9%) et de Soumbedioune avec 2 especes (6,8%). © 2019 International Formulae Group. All rights reserved Mots cles: Flore, Macroalgues marines, PNIM, Soumbedioune, Terrou-bi, Senegal English Title: Systematic composition of macroalgae flora along Dakar Atlantic coast (NPMI, Soumbedioune and Terrou-bi), Senegal (West Africa) English Abstract In Senegal, a lot of botanical studies have been carried out on the phanerogamic flora but rarely on bryophytes and algae flora despite their ecological, economic and scientific importance. Therefore, the aim of this study was to determine the structure of macroalgae flora through systematic composition in three different sites which are National Park of Madeleine Island, Soumbedioune and Terrou-bi located along the Dakar coast. During this study, seaweeds were inventoried, conserved and identified. The results showed that flora consisted of 21 taxa distributed in 13 genera, 11 families and 3 classes. The classes with the highest species richness were Ulvophyceae and Florideophyceae with respectively (38.09%) of recorded species while 23.8% of the flora belonged to the class of Phaeophyceae. This flora was more diverse in National Park of Madeleine Island where it was composed of 16 species (55.1%), followed by Terrou-bi with 11 species (37.9%) and the lowest number of species were recorded at Soumbedioune with only 2 species. © 2019 International Formulae Group. All rights reserved Keywords: Flora, Marine macroalgae, Atlantic coast, Senegal

Analyse de la flore des macroalgues de trois sites marins de Dakar (PNIM, Soumbédioune et Terrou-bi) au Sénégal