Metagenomic insight into the acidophilic functional communities driving elemental geochemical cycles in an acid mine drainage lake

环境化学 酸性矿井排水 硫黄 古细菌 微生物种群生物学 营养物 有机质 生物修复 无机碳总量 环境科学 生态学 植物 化学 生物 细菌 二氧化碳 污染 有机化学 遗传学
作者
Linqiang Ma,Joseph Frazer Banda,Yikai Wang,Qiaoqiao Yang,Linting Zhao,Chunbo Hao,Hailiang Dong
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:466: 133070-133070
标识
DOI:10.1016/j.jhazmat.2023.133070
摘要

Acidophiles play a key role in the generation, evolution and attenuation of acid mine drainage (AMD), which is characterized by strong acidity (pH<3.5) and high metal concentrations. In this study, the seasonal changes of acidophilic communities and their roles in elemental cycling in an AMD lake (pH∼3.0) in China were analyzed through metagenomics. The results showed eukaryotic algae thrived in the lake, and Coccomyxa was dominant in January (38.1%) and May (33.9%), while Chlorella in July (9.5%). The extensive growth of Chlamydomonas in December (22.7%) resulted in an ultrahigh chlorophyll a concentration (587 μg/L), providing abundant organic carbon for the ecosystem. In addition, the iron-oxidizing and nitrogen-fixing bacterium Ferrovum contributed to carbon fixation. Ammonia oxidation likely occurred in the acidic lake, as was revealed by archaea Ca. Nitrosotalea. To gain a competitive advantage in the nutrient-poor environment, some acidophiles exhibited facultative characteristics, e.g. the most abundant bacterium Acidiphilium utilized both organic and inorganic carbon, and obtained energy from organic matter, inorganic sulfur, and sunlight simultaneously. It was suggested that sunlight, rather than chemical energy of reduced iron-sulfur was the major driver of elemental cycling in the AMD lake. The results are beneficial to the development of bioremediation strategies for AMD.
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