Influence of granulometry on the distribution of benthic macro invertebrates in some streams of the Mvilla and Haut-Nyong watersheds in Cameroon

This study was conducted from November 2018 to October 2019 in 8 forested streams the Haut-Nyong and Mvilla watersheds determine influence of substrates granulometry on benthic macroinvertebrates. The physicochemical analyses showed highly oxygenated, weakly mineralized slightly acidic waters. granulometric reveal 9 categories depending scale sand, sand+gravel or sand+mud. Sampling macroinvertebrates allowed collection 15058 organisms divided into 5 classes, 14 orders 49 families. results a taxonomic richness strongly influenced by nature substrate. combination coarse sand + silt dead leaves more favored development with 48 associated different index revealed good ecological quality Sounou, Bengo'o Lo'o rivers.