Bacterial Community Profiling of Tropical Freshwaters in Bangladesh

Frontiers in Public Health

Nils-Kåre Birkeland¹  Nafisa Azmuda²  Md. Fakruddin³  Sirajul Islam Khan³ 

[1] Department of Biological Sciences, University of Bergen, Bergen, Norway;Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh;Department of Microbiology, University of Dhaka, Dhaka, Bangladesh;

关键词: freshwater lakes;    aquatic bacterial community;    tropical freshwater;    E. coli-Shigella group;    diarrheagenic E. coli;    Shigella;   

DOI  :  10.3389/fpubh.2019.00115

来源: DOAJ

【 摘 要 】

Seasonal and spatial variations in the bacterial communities of two tropical freshwater sources in Bangladesh, Lake Dhanmondi in central Dhaka, and a pond in the outskirts of Dhaka, were assessed and compared using PCR-DGGE and deep sequencing of 16S rRNA genes, as well as heterotrophic enrichments using water samples collected at nine different time points during 1 year. Temporal and spatial variations of common aquatic bacterial genera were observed, but no clear seasonal variations could be depicted. The major bacterial genera identified from these two sites were members of the Proteobacteria, Cyanobacteria, Actinobacteria, Bacteroidetes, Chlorobi, Chloroflexi, Verrucomicrobia, and Firmicutes. Among the proteobacterial groups, members of the α-, β-, and γ- Proteobacteria predominated. γ- Proteobacteria belonging to the Escherichia coli/Shigella group even the diarrheagenic pathotypes of E. coli e.g., EPEC and ETEC were detected in most samples throughout the year, with no apparent correlations with other microbial groups. The other pathotypes, EHEC, EAEC, and EIEC/Shigella spp. were also detected occasionally. This study represents the first thorough analysis of the microbial diversity of tropical freshwater systems in Bangladesh.

【 授权许可】

Unknown