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Microplastics and heavy metals reshape mangrove rhizosphere microbiomes and compromise carbon fixation potential

Ecotoxicology and Environmental Safety 2025 2 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 58 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Zhenqing Dai, Linglong Cao, Huifeng Xie, Ruikun Sun, Chengyong Li Huifeng Xie, Lei He, Lei He, Lei He, Lei He, Lei He, Lei He, Linglong Cao, Huifeng Xie, Huifeng Xie, Chengyong Li Lei He, Zhenqing Dai, Ruikun Sun, Chengyong Li Zhenqing Dai, Huifeng Xie, Huifeng Xie, Lei He, Lei He, Lei He, Lei He, Lei He, Huifeng Xie, Lei He, Lei He, Lei He, Huifeng Xie, Chengyong Li Lei He, Lei He, Zhenqing Dai, Zhenqing Dai, Lei He, Lei He, Huifeng Xie, Ruikun Sun, Lei He, Huifeng Xie, Linglong Cao, Zhenqing Dai, Lei He, Linglong Cao, Ruikun Sun, Ruikun Sun, Ruikun Sun, Lei He, Lei He, Lei He, Lei He, Lei He, Lei He, Lei He, Lei He, Zhenqing Dai, Zhenqing Dai, Ruikun Sun, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Ruikun Sun, Zhenqing Dai, Zhenqing Dai, Chengyong Li Lei He, Lei He, Lei He, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Huifeng Xie, Zhenqing Dai, Zhenqing Dai, Chengyong Li Huifeng Xie, Zhenqing Dai, Ruikun Sun, Ruikun Sun, Lei He, Lei He, Chengyong Li Zhenqing Dai, Zhenqing Dai, Zhenqing Dai, Ruikun Sun, Chengyong Li Ruikun Sun, Ruikun Sun, Zhenqing Dai, Zhenqing Dai, Ruikun Sun, Zhenqing Dai, Zhenqing Dai, Chengyong Li Chengyong Li Lei He, Zhenqing Dai, Chengyong Li Chengyong Li Chengyong Li Chengyong Li Ruikun Sun, Zhenqing Dai, Ruikun Sun, Zhenqing Dai, Chengyong Li Zhenqing Dai, Chengyong Li Ruikun Sun, Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Lei He, Zhenqing Dai, Chengyong Li Chengyong Li Zhenqing Dai, Chengyong Li Chengyong Li Lei He, Ruikun Sun, Zhenqing Dai, Chengyong Li Chengyong Li Zhenqing Dai, Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li Chengyong Li

Summary

Researchers investigated how microplastics and heavy metals together affect the microbial communities around mangrove tree roots. They found that combined pollution significantly reduced microbial diversity and shifted the balance of bacterial species, which in turn compromised the ability of these ecosystems to capture and store carbon. The study highlights that microplastic-metal co-contamination poses a compounding threat to mangrove ecosystems, which play an important role in coastal carbon storage.

Polymers

PA PE PP

Study Type Environmental

Mangroves with developed root systems at the land-sea junction act as sinks for microplastics (MPs). Heavy metals (HMs), persistent contaminants in coastal ecosystems, coexist with MPs globally. However, the complex effects of MP-HM pollution on mangrove ecosystems remain unclear. Herein, the combined effects of various MPs (polypropylene (PP), polyethylene (PE), polyamide (PA)) and 10 HM (Cr, Cu, Pb, Zn, Cd, Mn, Co, Hg, As, and Ni) on the rhizosphere microecology of the mangrove plant Avicennia. marina (Forssk.) Vierh. (A. marina) were determined. The combined pollution caused by MPs-HMs changes the rhizosphere microbial community structure of A. marina and decreases species richness and diversity. The relative abundance of dominant bacteria (Firmicutes) in the PP-HM exposure (PPz) group increased by 58 %, and that of ε-Proteobacteria decreased by 49 %, compared with those in the heavy metal exposure (Z) group. PP and PA in the sediment enriched Bacillales (12 %) and Sphingomonales (3.6 %), respectively. The following were the distinct responses to the combined MP-HM pollution by the rhizosphere bacterial community: (1) sensitivity, which changed rapidly within 7 d of exposure, (2) specificity, differential enrichment of bacterial communities under MP vs HM stress, and (3) persistent alterations in functional bacteria following exposure. MPs in the sediment changed the bacterial community structure of the rhizosphere sediment by selective enrichment of the microbial taxa with specific plastic degradation functions. Thus, the long-term coexistence of MPs-HMs and microbes in mangrove wetlands may subtly change the biogeochemical cycling processes in coastal ecosystems. This study indicates the ecological effects of MPs-HMs in the rhizosphere environment, which provides theoretical support and scientific basis for the study of biogeochemical cycles.

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