853175676
REMERCIEMENTSNous pensons au projet REAFOR pour sa subvention, à l'Université de Namur/ Belgique. Mots clés : Habitats, diversité, Mormyridae, distribution spatiale, rivières Yoko et Biaro. BYANIKIRO et al. / Int. J. Biol. Chem. Sci. 11(3): 967-999, 2017 968 Characterization and ecology of stands of Mormyrids in the Reserve of Yoko (Kisangani, DR. Congo)
R. M.
ABSTRACTStudy on the Mormyridae stands in two forest rivers Yoko and Biaro near Kisangani, aimed at characterizing and studying the ecology of the Mormyridae one family of bio-indicator that can be used in conservation and monitoring. It was conducted from September 2008 to August 2009, using gillnets, longlines and traditional traps for the harvest of fish. The characterization of Habitat was made according to a morphology follow -up from specifying transverse profiles every 50 m for each of the 8 selected stations. 214 specimens of fish belonging to 7 species and 4 genera were harvested. Stomatorhinus corneti species is the most represented with 144 specimens either 67.3%, followed by Petrocephalus microphtalmus with 50 individuals or 23.4%. The highest taxonomicrichness was observed in stations Yoko 4 (6 species) and Biaro 3 (5 species) and high diversity and equitability indices. The AFC show that there are net links between environmental variables: width, depth, dissolved oxygen, current speed of water, vegetation, nature of the substrate (Sandy -clayey, stony, gravelly, etc.) and that S. corneti and P. microphtalamus species are strongly linked to the stations Yoko 2 and 3, Biaro 1, 2 and 4 in positive correlation between these variables and axes I and II. This undoubtedly shows that fish communities are distributed based on a complex set of interrelationships between different abioc and biotic variables that describe the environment among others the substrate (mineral or vegetable), depth, oxygen dissolved, etc.