STRUCTURE AND DYNAMIC OF PERIPHYTICS ALGAE OF BATIKA (YABASSI) AND TONGO’O BASSA RIVERS (DOUALA)

The rampant and uncontrolled human impact degrades increasingly freshwater resources available in surface. The overall objective of the study is to determine the diversity and distribution of microalgal periphytics communities Batika and Tongo'o Bassa rivers. The specific objectives are to make a floristic inventory; measure the physicochemical parameters associated with these rivers and to identify their spatial and temporal variations. Organic materials and stones were sampled in each river. A total of 87 species were identified, of which about 39.08% of Diatomophyceae, 26.43% of Chlorophyceae, 11.49% of Cyanophyceae, 09.19% of Zygophyceae, 08.04% of Euglenophyceae, 03.44% of Dinophyceae, 01.14% respectively Chrysophyceae and Prasinophyceae. Diatoms are the most frequent class in samples of river stations. Chlorophyceae are the most dominant class and dense in all stations. The Uronema elongatum, Mougeotia sp. and Oedogonium sp. 1 species are common to all stations. The specific changes in algal communities between stations located upstream from the stations located in the transition and downstream are striking, with a richness and diversity in higher epiphyton station 1 (46 species) and lower the epilithon station 6 (8 species).