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<p>Thallium (Tl) contamination in freshwater ecosystems posed significant risks to microbial communities and ecosystem functions. This study investigated the effects of Tl pollution on microbial diversity and carbon, nitrogen and sulfur cycling, focusing on microbial responses to varying Tl concentrations. Microbial community composition was altered by Tl, with archaea exhibiting higher resistance than bacteria. Low Tl concentrations had more complex impacts on microbial functions, particularly affecting carbon fixation, denitrification, and sulfate reduction pathways. Our findings highlighted the role of specific microbial functional genes and metabolic pathways in mitigating metal toxicity, with sulfate-reducing bacteria (SRB) showing potential for Tl precipitation and environmental recovery. The study provided new insights into microbial resilience under Tl stress and offered perspectives for ecological restoration in Tl-impacted ecosystems.</p>

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Impact of thallium contamination on microbial communities and biogeochemical cycles in freshwater ecosystems

  • 期刊论文

  • 发表日期：

    2025年8月17日

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  • Shuang Yan,
  • Yongxin Bing,
  • Qianli Ma,
  • Rui Zhao,
  • Xiaodie Cai,
  • Yuyin Yang,
  • Sili Chen,
  • Shuguang Xie

摘要

Thallium (Tl) contamination in freshwater ecosystems posed significant risks to microbial communities and ecosystem functions. This study investigated the effects of Tl pollution on microbial diversity and carbon, nitrogen and sulfur cycling, focusing on microbial responses to varying Tl concentrations. Microbial community composition was altered by Tl, with archaea exhibiting higher resistance than bacteria. Low Tl concentrations had more complex impacts on microbial functions, particularly affecting carbon fixation, denitrification, and sulfate reduction pathways. Our findings highlighted the role of specific microbial functional genes and metabolic pathways in mitigating metal toxicity, with sulfate-reducing bacteria (SRB) showing potential for Tl precipitation and environmental recovery. The study provided new insights into microbial resilience under Tl stress and offered perspectives for ecological restoration in Tl-impacted ecosystems.