Ecological risks in a 'plastic' world: A threat to biological diversity?

Area of Science:

• Environmental Science
• Ecology
• Microbiology

Background:

• Microplastic pollution is a growing global concern with increasing environmental prevalence.
• While individual organism impacts are known, community and ecosystem-level effects of microplastics are less understood.
• Existing research highlights the need to investigate microplastic effects on biodiversity and ecosystem functions.

Purpose of the Study:

• To review and synthesize current literature on microplastic impacts on biological communities, biodiversity, and ecosystem processes.
• To identify conserved patterns of microplastic-induced alterations in microbial communities.
• To assess the potential implications of microplastic pollution for ecosystem functions and sustainability goals.

Main Methods:

• Literature review of published studies on microplastics and their ecological effects.
• Analysis of data on changes in taxonomic abundance and community composition.
• Synthesis of findings related to microbial diversity, biogeochemical cycles, and greenhouse gas fluxes.

Main Results:

• Microplastics cause shifts in taxonomic abundance, favoring some taxa while reducing others.
• Microbial community composition is altered in both natural environments and animal guts, with conserved patterns across taxa.
• Microplastic exposure can lead to reduced or increased microbial alpha diversity, depending on dose and conditions.
• Biogeochemical cycles, greenhouse gas fluxes, and atmospheric chemistry are potentially affected by microplastic pollution.

Conclusions:

• Microplastic pollution significantly alters microbial community structure and function, with implications for biodiversity.
• These alterations pose a potential threat to ecosystem health and the achievement of U.N. Sustainability Development Goals.
• Further research is crucial to fully understand and mitigate the widespread ecological consequences of microplastic contamination.