The prokaryotic community of a historically mining-impacted tropical stream sediment is as diverse as that from a pristine stream sediment.

摘要: Mining negatively affects the environment by producing large quantities of metallic tailings, such as those contaminated with arsenic, harmful consequences for human and aquatic life. A culture-independent molecular analysis was performed to assess prokaryotic diversity community structural changes tropical historically metal-contaminated Mina stream (MS) relatively pristine Mutuca (MTS) sediments. total 234 bacterial operational taxonomic units (OTUs) were affiliated 14 17 phyla 53 OTUs associated two archaeal phyla. Although compositions these sediments markedly distinct, no significant difference in indices between communities observed. Additionally, rarefaction indicated a higher than diversity. Most Proteobacteria Bacteroidetes Alphaproteobacteria, Gemmatimonadetes Actinobacteria only found MS clone library. Crenarchaeal 16S rDNA sequences constituted 75 % clones, whereas Euryarchaeota dominant MTS clones. Despite different characteristics streams, their harbor high diversity, suggesting that mining-impacted promote The findings also provide basis further investigation members Alphaproteobacteria potential biological indicators arsenic-rich