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Microplastic pollution disrupts microalgal physiology globally: a meta-analysis
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A large analysis of 67 studies found that microplastics harm the tiny algae that form the base of freshwater food chains, stunting their growth, reducing their numbers, and impairing photosynthesis, with the smallest "nanoplastic" particles causing the most damage. Since these algae produce oxygen and support the entire aquatic food web (including fish we eat), widespread plastic pollution could ripple upward, potentially affecting water quality and food supplies that humans depend on.
Microplastic (MP) pollution threatens aquatic primary producers, yet global patterns of their impact on microalgal physiology remain unclear. Using a meta-analysis of 3863 observations from 67 freshwater studies, this research quantifies biological effects (percentages back-transformed from effect sizes). Microplastics significantly inhibited growth (-30%), abundance (-18.1%), and photosynthesis (-13%), while inducing oxidative stress (50%) and promoting metabolite synthesis (21%). Notably, growth and abundance suppression showed limited dependence on mass concentration, likely because mass metrics obscure the higher particle numbers and surface areas of smaller plastics. In contrast, oxidative stress, photosynthetic inhibition, and metabolic accumulation increased dose-dependently. Nanoplastics (≤1 μ m) suppressed growth and photosynthesis over twice as strongly as larger microplastics (>1 μ m). Polymer type modulated impacts: PE, PVC, and PS reduced abundance similarly, while PET had the weakest effect. Growth inhibition was phylum-specific (sensitive: Chlorophyta, Cyanophyta; unaffected: Bacillariophyta), whereas photosynthetic and oxidative stress responses were universal. White microplastics consistently inhibited growth and photosynthesis and induced oxidative stress. Time-series analysis revealed divergent trajectories: growth inhibition intensified over time, abundance suppression attenuated, and metabolite accumulation increased, likely reflecting a physiological trade-off. These quantitative associations provide a baseline for refining freshwater environmental risk assessment.
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Ecotoxicity of micro- and nanoplastics on aquatic algae: Facts, challenges, and future opportunities
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This review provides a comprehensive assessment of how micro- and nanoplastics harm aquatic algae, which form the base of ocean and freshwater food chains. The toxic effects include reduced growth, oxidative stress, and disrupted photosynthesis, with nanoplastics generally causing more damage than larger particles. Since algae support the entire aquatic food web, their decline from plastic pollution could reduce the quality and safety of fish and shellfish consumed by people.
Research advances on impacts micro/nanoplastics and their carried pollutants on algae in aquatic ecosystems: A review
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This review examines how micro- and nanoplastics harm algae, which are the foundation of aquatic food chains, by slowing growth, reducing photosynthesis, and damaging cells. The effects are worse when microplastics carry other pollutants on their surfaces, creating a combined toxic effect. Since algae support the entire aquatic food web, damage to these organisms can ripple upward through fish and shellfish to affect the safety of seafood consumed by humans.
Microplastics – An emerging contaminants for algae. Critical review and perspectives
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This review examines how microplastics and nanoplastics affect algae, which are the foundation of aquatic food chains. Microplastics can reduce algae growth, disrupt photosynthesis, and cause oxidative stress, with smaller nanoplastics being more harmful. Since algae are at the base of the food web, damage to them can ripple through ecosystems and ultimately affect the seafood that humans consume.
Meta-analysis for systematic review of global micro/nano-plastics contamination versus various freshwater microalgae: Toxicological effect patterns, taxon-specific response, and potential eco-risks
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A meta-analysis of 1,071 observations found that nanoplastics cause more severe cell membrane damage than microplastics, while microplastics more strongly inhibit photosynthesis in freshwater microalgae. Among polymer types, polyamide caused the highest growth inhibition, polystyrene induced the most toxin release, and diatoms were the most sensitive algal group while cyanobacteria showed exceptional resilience.
Effects of microplastics on microalgae populations: A critical review
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This critical review examines how microplastics affect microalgae populations, which are essential primary producers at the base of aquatic food webs. Researchers found that microplastics can reduce algal growth, impair photosynthesis, and cause oxidative stress, with effects varying by plastic type, size, and concentration. The study highlights that harm to microalgae from plastic pollution could have cascading effects throughout entire aquatic ecosystems.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.