Authors : Branes Zidane, Abdi Akila, Makhlouf Ounissi and Amblard Christian
Abstract: Oubeira is an endorheic freshwater lake rich in organic substances and therefore it is considered as an ecosystem very favorable to the proliferation of potentially toxic cyanobacteria. The aim of the present study is to investigate the specific dynamics of cyanobacteria with an estimated production of biomass. The obtained results showed that Oubeira is highly favorable for the development and growth of cyanobacteria. Such class is dominated by species Aphanizomenon flos-aquae in the station North and center station with densities of 14x105 and 107 cell mL-1, respectively. They are relatively high compared to other species of cyanobacteria. At the South station, the densities seem unaffected by the season’s variations and remain constant at about 106 cell mL-1. The species Microcystis aeruginosa, Chroococcus turgid, Oscillatoria rubescens and Anabaenopsis elenkini displayed similar densities at whole station with a slight dominance of Anabaenopsis elenkini. The contribution of cyanobacteria seems under the domination of Microcystis aeruginosa where its biomass is much higher than the other species. The maximum production was observed in the Southern station during July with 120 μgC L-1. Whereas the biomass is much lower in the North and center stations where they reach 70 μgC L-1. Moreover, the genus of cyanobacteria that dominate the Oubeira Lake are Microcystis, Aphanizomenon and to a lesser extent Anabaenopsis.
Branes Zidane, Abdi Akila, Makhlouf Ounissi and Amblard Christian, 2013. Dynamic Densities and Specific Cyanobacteria Biomass of Oubeira Lake (National Parc of Elkala, Algeria). Environmental Research Journal, 7: 9-14.