Detection of sentinel bacteria in mangrove sediments contaminated with heavy metals
Detection of sentinel bacteria in mangrove sediments contaminated with heavy metals
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DOI：
10.1016/j.marpolbul.2019.110701
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发表时间：
2020-01-01
影响因子：
5.8
通讯作者：
De la Iglesia, R.
中科院分区：
文献类型：
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作者：
Fernandez-Cadena, J. C.;Ruiz-Fernandez, P. S.;De la Iglesia, R.
南美洲西北海岸的红树林因工业废水排放而受到重金属污染，影响了该环境的生物群。然而，细菌在这些恶劣的环境条件下增殖，成为这些污染的可能哨兵。在这项研究中，细菌群落组成进行了分析的16 S rRNA基因的通量测序污染和原始红树林沉积物中的重金属浓度的显着差异的影响。核心细菌以变形菌门、厚壁菌门和拟杆菌门为主，不同地点在纲和属水平上存在很大差异，与金属水平相关。特定OTU丰度的增加与金属浓度的升高或降低以及硫循环有关。随着金属含量的增加，嗜石硫菌、缓步小球藻、多噬脱硫球菌和科隆氨基杆菌的丰度也随之增加。相反，当金属水平降低时，Stamsii芽孢杆菌、硝酸还原菌和少食梭菌的丰度增加。我们建议这些OTU作为细菌哨兵，其丰富的可以帮助监测污染的红树林沉积物的修复计划在未来。
Mangroves in the Northwest Coast of South America are contaminated with heavy metals due to wastewater discharges from industries, affecting the biota from this environment. However, bacteria proliferate in these harsh environmental conditions becoming possible sentinel of these contaminations. In this study, bacterial community composition was analyzed by throughput sequencing of the 16S rRNA gene from polluted and pristine mangrove sediments affected by marked differences in heavy metal concentrations. Core bacteria were dominated by Proteobacteria, Firmicutes, and Bacteroidetes phyla, with strong differences between sites at class and genus levels, correlated with metal levels. Increment of abundance on specific OTUs were associated with either elevated or decreased concentrations of metals and with the sulfur cycle. The abundance of Sulfurovum lithotrophicum, Leptolinea tardivitalis, Desulfococcus multivorans and Aminobacterium colombiense increases when metals rise. On contrary, Bacillus stamsii, Nioella nitrareducens and Clostridiisalibacter paucivorans abundance increases when metal levels are reduced. We propose these OTUs as bacterial sentinels, whose abundance can help monitor the restoration programs of contaminated mangrove sediments in the future.