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Accounting for species traits and exposure complexity to understand organism responses to microplastics and multistressors
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This review paper argues that scientists have been studying microplastics too simply, testing one plastic type at a time without considering how factors like plastic age, chemical coatings, and other environmental stressors (like pollution or heat) combine to affect living things differently. The authors say we need more realistic experiments that reflect how microplastics actually behave in nature, because right now our risk assessments may be underestimating or misjudging the real dangers these particles pose to organisms, and ultimately to the food chains humans depend on.
Our understanding of the abundance and hazard of microplastics has rapidly grown in recent years, however experimental studies and subsequent risk assessments largely fail to account for the complexity of microplastics, their interactions with the wider environment, and different species’ exposures and responses. Microplastic complexity could lead them to be considered as multistressors in their own right. Uncertainties remain with respect to a) how particle characteristics can alter the hazard they pose (especially polymer type and aging), b) microplastic interactions with the vast array of wider physical, chemical and environmental stressors (multistressors), and c) microplastics’ bioavailability and different species responses, especially relating to species traits. In addition, these factors interact to affect exposure, uptake and toxicity simultaneously across ecosystems. The current perspective piece explores the ways in which systems-thinking and targeted, biologically relevant experiments can be implemented to better understand these processes, and their interconnectivity, to progress knowledge of realistic microplastic effects. Without these considerations when designing experiments and interpreting ecotoxicological data, understanding of microplastics as a biological hazard will continue to be oversimplified and unrepresentative of the real environment, impeding our ability to make real, actionable change to solve the plastic pollution problem.
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Freshwater systems in the Anthropocene: why we need to evaluate microplastics in the context of multiple stressors
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Real-world organisms are exposed to microplastics alongside many other environmental stressors — temperature change, chemical pollutants, habitat degradation — yet most lab studies test microplastics in isolation. This review argues that ecotoxicology needs to adopt a multi-stressor approach to truly understand how microplastics affect freshwater life at every level, from individual cells to whole ecosystems. Without this broader context, risk assessments will consistently underestimate the actual harm microplastics cause in nature.
Microplastics and complex environmental contaminants: Interactions with heatwave, pesticides, pharmaceuticals, and pathogens – a systematic review
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This review paper looked at thousands of studies on how microplastics interact with other environmental hazards like heat waves, pesticides, medications, and germs — but found that scientists usually only test one hazard at a time, not how they combine in the real world. This matters because in nature, microplastics never act alone; they mix with these other contaminants in ways that could make their health and environmental effects worse than current research suggests. The takeaway: we likely don't yet have the full picture of how risky microplastics really are, since real-world exposure is far more complicated than most lab experiments.
Micro- and nanoplastics effects in a multiple stressed marine environment
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Researchers examined how micro- and nanoplastics interact with other environmental stressors in marine settings, finding that realistic multi-stressor scenarios can amplify or modify plastic toxicity in ways single-exposure studies miss.
Comprehending the complexity of microplastic organismal exposures and effects, to improve testing frameworks
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This review argues that standard toxicity testing frameworks are poorly suited to capture the complexity of microplastic exposures in real environments, proposing improved testing approaches that account for particle mixtures, realistic concentrations, and species-specific feeding behaviors.
Stressor Exposures Determine Risk: So, Why Do Fellow Scientists Continue To Focus on Superficial Microplastics Risk?
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This commentary challenges the field's focus on microplastic concentrations in isolation, arguing that stressor exposures determine risk and urging researchers to consider realistic environmental conditions, bioavailability, and co-occurring stressors when assessing ecological harm.
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