Depth-related change of sulfate-reducing bacteria community in mangrove sediments: The influence of heavy metal contamination

Sijie Wu; Ruili Li; Shuguang Xie; Cong Shi

doi:10.1016/j.marpolbul.2019.01.042

Depth-related change of sulfate-reducing bacteria community in mangrove sediments: The influence of heavy metal contamination

Mar Pollut Bull. 2019 Mar:140:443-450. doi: 10.1016/j.marpolbul.2019.01.042. Epub 2019 Feb 8.

Authors

Sijie Wu¹, Ruili Li², Shuguang Xie³, Cong Shi⁴

Affiliations

¹ School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen 518055, Guangdong, China. Electronic address: wusj@pku.edu.cn.
² School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen 518055, Guangdong, China. Electronic address: liruili@pkusz.edu.cn.
³ State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
⁴ School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen 518055, Guangdong, China.

PMID: 30803665
DOI: 10.1016/j.marpolbul.2019.01.042

Abstract

This study provides new insight towards the effects of heavy metal contamination on sulfate-reducing bacteria (SRB) in mangrove ecosystem. We investigated SRB communities in mangrove sediments (0-30 cm depth) from Futian, Xixiang and Shajing mangrove wetlands in Shenzhen, China, with different heavy metal contamination levels. The results showed that SRB community abundance (1.71 × 10⁷-3.04 × 10⁸ dsrB gene copies g^-1 wet weight sediment) was depth-related and significantly correlated with Cd and Ni concentrations. The α-diversity indices of SRB community (Chao1 = 21.25-84.50, Shannon = 2.31-2.96) were significantly correlated with Cd level in mangrove sediments. Desulfobacteraceae, Desulfobulbaceae and Syntrophobacteraceae acted as major SRB groups in mangrove sediments, and Syntrophobacteraceae was most sensitive to metal contamination. UniFrace clustering analysis revealed that SRB community structure was influenced by the heavy metal concentrations. Moreover, redundancy analysis indicated that Cd and total phosphorus were the major environmental factors affecting the SRB structure in mangrove sediments.

Keywords: Heavy metal; Mangrove; Sediment; Sulfate-reducing bacteria.

MeSH terms

China
Geologic Sediments / chemistry*
Geologic Sediments / microbiology
Metals, Heavy / toxicity*
Microbiota / drug effects*
Sulfur-Reducing Bacteria / drug effects*
Water Pollutants, Chemical / toxicity*
Wetlands*

Substances

Metals, Heavy
Water Pollutants, Chemical