Mosses in Urban Environments as Passive Biofilters and Organisms Impacted by Asbestos-Contaminated Habitats

Our plain-English summary of Mosses in Urban Environments as Passive Biofilters and Organisms Impacted by Asbestos-Contaminated Habitats, by G.Z. Macher, D. Beke (International Journal of Environmental Research and Public Health, 2025).

The study

• Authors: G.Z. Macher, D. Beke
• Journal: International Journal of Environmental Research and Public Health
• Published: 2025;22(6)
• Type of article: Review
• Read it: PubMed · Publisher · Free full text

Abstract

Asbestos cement materials represent a persistent source of environmental contamination, particularly in urban areas where weathering facilitates the release of hazardous chrysotile fibres. Despite extensive research on the human health impacts of asbestos, ecological interactions remain poorly understood. This paper explores the dual role of bryophytes colonising asbestos cement roofing as passive filters that trap airborne fibres and as vulnerable organisms subjected to asbestos-induced stress. Using a synthesis of recent findings, we assess the capacity of mosses to immobilise chrysotile fibres through their dense, mat-like structures, potentially reducing local dispersion. Simultaneously, we examine physiological and biochemical responses to prolonged fibre exposure, including reduced photosynthetic activity and signs of oxidative stress. The findings highlight a paradoxical function of bryophytes: while they contribute to pollution mitigation, they also accumulate contaminants and suffer from sublethal damage. These interactions may have broader implications for contaminant redistribution, particularly through decomposition and trophic transfer. Understanding these dynamics is essential for advancing ecological risk assessments and developing sustainable remediation strategies in asbestos-contaminated habitats.

In plain English

This article was a review, not a new study. The authors set out to bring together published ecological, toxicological and environmental health research on mosses (bryophytes) that grow on weathered asbestos cement roofing in cities. They focused on whether mosses can hold on to chrysotile fibres and how long-term exposure may affect the mosses. Drawing on that literature, the authors wrote that the dense, mat-like growth of mosses could trap fibres and potentially reduce the spread of airborne asbestos nearby. They also wrote that evidence suggests chrysotile exposure is associated with lower chlorophyll content, reduced photosynthetic efficiency and changes in cell membrane permeability, while noting that the mechanisms remain underexplored. Stating that direct evidence is scarce, they raised the possibility that fibres held by mosses could pass into food webs. They also suggested that green moss cover might hide hazardous roofs from public notice. The authors concluded that mosses act both as fibre filters and as organisms stressed by fibres. Without pilot studies and field experiments, they said, using mosses to contain asbestos remains speculative. They described the existing literature as sparse and largely descriptive.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: narrative review (synthesis of published literature)
• Who was studied: Published literature on mosses (bryophytes) colonising asbestos cement surfaces, especially roofing in urban environments
• Exposure: Chrysotile fibres released from weathering asbestos cement roofing
• Main results:
  • The authors wrote that moss mats may retain asbestos fibres, which could potentially reduce the dispersal of airborne asbestos nearby
  • According to the literature reviewed, chrysotile exposure is associated with reduced chlorophyll content, impaired photosynthetic efficiency and altered cell membrane permeability in bryophytes
  • The authors described field observations and limited surveys suggesting that moss genera such as Hypnum, Bryum and Dicranum are often found on asbestos cement surfaces
  • The authors raised the possibility that fibres retained by mosses could enter food webs, while noting that direct evidence is scarce
  • The authors suggested that moss cover on asbestos cement roofs may hide the presence of hazardous material from the public
  • The authors described mosses as both biological filters for fibres and organisms susceptible to fibre-related stress
• The authors' conclusion: The authors concluded that, until pilot studies and field experiments provide evidence, using mosses to contain asbestos fibres remains speculative
• Limitations the authors state:
  • The authors stated that the existing literature on moss and asbestos interactions is sparse and largely descriptive
  • The authors stated that the mechanisms of physiological stress in bryophytes remain underexplored
  • The authors stated that pilot studies and in situ experiments are needed to test whether moss-covered surfaces could work as containment systems

Topics

The National Library of Medicine indexes this study under subjects our site covers: Chrysotile.

Medical terms in this study, explained in our Lexicon: Asbestos-Cement, Chrysotile, Oxidative Stress.

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