Radon and heavy metal (HM) contamination in drinking water and their impact on health have been reported earlier. However, yet, relatively little is known about the microbial community in the drinking water with gradients of radon and the drivers of microbial community patterns in such water. With this view, we first examine microbial dynamics of drinking water in the permissible level 93±2 Bq/l (control), 510±1.5 6 Bq/l and 576±2 Bq/l as medium and 728±3 Bq/l as high radon containing tube wells from Dumka and Godda district, which comes under a major fault of eastern fringes, India. Attempts have also been made to predict the impact of radon contamination gradient and other water environmental parameters on community structure. The measured physicochemical character revealed strong clustering by sampling site with respect to their radon and HM content. The radon contaminated sites represent HM rich nutrient-limited sites compared to control. The Radon (Rn), HM (Pb, Cu and As) and total suspended solids (TSS) were the most determinant variable among the parameters and influenced the microbial community composition of that region. The microbial diversity of those sites was less diverse and this measured diversity decreased gradually on the sites with an increased gradient of radon contamination. The dominant microbial family in contaminated sites were Moraxellaceae, Chitinophagaceae, unclassified Candidatus Azambacteria, unclassified Candidatus Moranbacteria, unclassified Candidatus Collierbacteria and Gammaproteobacterial members which are reported to be abundantly inhabitant in radiation and chemolithotrophic environments pose better radionuclides protective mechanisms while the bacterial members dominant in control site Comamonadaceae, Rhodocyclaceae, Nitrospirales Incertae Sedis, cvE6, unclassified Woesearchaeota (DHVEG-6), and Holophagaceae reported to adundant in natural soil and drinking water labile to harsh environments. Relative sequence abundance of Comamonadaceae was decreasing on the sites with increasing radon gradient while the opposite trend observed for Chitinophagaceae. The distribution of such microbial assembles is linked to radon and heavy metal, highlighting that taxa with distinct environmental preferences underlie apparent clustering by sites, thus can utilize them for biostimulation based in-situ bioremediation purpose.

中文翻译：

---

gradient浓度梯度的饮用水微生物群落主要是由ra和重金属含量引起的

饮用水中的Rad和重金属（HM）污染及其对健康的影响已有较早的报道。但是，关于饮用水中微生物群落的梯度relatively和这种微生物群落模式的驱动因素知之甚少。基于这种观点，我们首先研究了饮用水的微生物动力学，其允许水平为93±2 Bq / l（对照），510±1.5 6 Bq / l和576±2 Bq / l为中等，而728±3 Bq / l为中等。来自杜姆卡（Dumka）和戈达（Godda）地区的含高ra的管井，这是印度东部边缘地区的主要断层。还尝试了预测predict污染梯度和其他水环境参数对群落结构的影响。测得的理化特性表明，就其ra和HM含量而言，采样点具有很强的聚集性。与对照相比，污染的位点代表了富含HM的养分受限位点。among（Rn），重金属（Pb，Cu和As）和总悬浮固体（TSS）是参数中最决定性的变量，并影响该区域的微生物群落组成。这些位点的微生物多样性较差，并且随着measured污染梯度的增加，这些测得的多样性在这些位点逐渐降低。在受污染的地点，主要的微生物家族是莫拉菌科，几丁质菌科，未分类的念珠菌假丝酵母，未分类的念珠菌丝菌，据报道在辐射和化学营养环境中大量居住的未分类的念珠菌结肠杆菌和γ-变形杆菌细菌具有更好的放射性核素保护机制，而在控制部位Comamonadaceae，Rhodocyclaceae，Nitrospirales Incertae Sedis，cvE6，未分类的Woesearchaeota（DH）中占优势的细菌成员。据报道，全科植物在自然土壤和饮用水中含量丰富，对恶劣环境不利。在a梯度增加的位点上，Comamonadaceae的相对序列丰度降低，而Chitinophagaceae则观察到相反的趋势。这种微生物集合体的分布与ra和重金属有关，这突显出具有明显的环境偏好的生物分类群是按地点明显聚集的基础，