Ayoade AA1 and Nierziwicki- Bauer SA
Abstract
Lakes Eleyele and Asejire are tropical man-made lakes (reservoirs) in southwestern Nigeria created for domestic water supply and fisheries. The abiotic and biotic features of the two lakes have been studied by various researchers. However, there is little or no study on the bacteria community despite being of ecological and public health concern. In this article, the bacterioplankton composition and diversity of Eleyele and Asejire Lakes were investigated by sequencing 16S rRNA gene clones. Our results showed that proteobacteria was the dominant phylum in Eleyele Lake, while actinobacteria phylum dominated in Asejire Lake. In both lakes, bacteria that contribute to prokaryotic primary production (Limnohabitans, Methylobacterium, and Methylotenera) and biogeochemically significant bacteria were encountered. Polynucleobacter was the predominant genus in Lake Eleyele and this could be related to the physicochemical parameters. Large number of bacterioplankton in the Eleyele and Asejire Lakes could not be classified into known taxonomic unit indicating largely unknown bacterial composition.
Keywords: Bacteria composition; Clone library; 16S rRNA; Asejire and Eleyele Lakes; Freshwater lake.