Papers

Sorption of PFOS onto polystyrene microplastics potentiates synergistic toxic effects during zebrafish embryogenesis and neurodevelopment

Researchers found that polystyrene microplastics can absorb PFOS (a persistent industrial chemical) from water and deliver it to zebrafish embryos in a more concentrated form. The combination caused worse developmental problems than either pollutant alone, including delayed hatching, higher death rates, birth defects, and impaired brain development. This shows microplastics can act as carriers that intensify the toxic effects of other environmental chemicals.

Using machine learning to reveal drivers of soil microplastics and assess their stock: A national-scale study

Using machine learning on data from 621 sites across China, researchers identified nine key factors driving microplastic distribution in soil, including population density, plastic production, and agricultural practices. The study estimated that Chinese topsoil contains a substantial stock of microplastics, with concentrations varying widely by region. This large-scale analysis helps predict where microplastic contamination is worst, which is important for understanding human exposure through food grown in contaminated soil.

Why we need an international agreement on marine plastic pollution

This commentary argues for the establishment of an international agreement to address marine plastic pollution, noting that plastic debris including microplastics is a pervasive global threat to marine biodiversity, ecosystem services, and potentially human health. The authors highlight that existing regulatory frameworks are insufficient to manage the transboundary nature of the problem. The study calls for measurable reduction targets and coordinated international action to curb the flow of plastic into the world's oceans.

Assessing microplastic exposure of large marine filter-feeders

Researchers analyzed whale scat to estimate microplastic exposure in baleen whales feeding in coastal New Zealand waters. Using stochastic simulation modeling, they estimated whales ingest over 3.4 million microplastics per day, a figure four orders of magnitude higher than would be predicted from surface water measurements alone. The study suggests that trophic transfer through prey is the dominant exposure route for large filter-feeding marine animals, not direct environmental ingestion.

The Human Interference Scoring System (HISS): A New Tool for Quantifying Food Quality Based on Its Level of Processing

Researchers developed a new food classification tool called the Human Interference Scoring System that categorizes foods by their level of processing using photographs. They found high reliability among trained raters, especially for distinguishing unprocessed from ultra-processed foods. Ultra-processed items consistently had more calories, carbohydrates, and sugar, while unprocessed foods had notably higher fiber content.

Aerosol mass concentrations and dry/wet deposition of atmospheric microplastics at a remote coastal location in New Zealand

Researchers quantified airborne microplastic concentrations at a remote coastal site in southern New Zealand using both active and passive sampling methods. They found plastics comprised at least 0.14% of total suspended particulate mass, with air trajectory analysis suggesting the Southern Ocean as a source. The study indicates that counting microplastics by number alone may significantly underestimate true atmospheric plastic pollution, since the smallest and most abundant particles escape microscopic detection.

Transport and retention of sinking microplastics in a well-mixed estuary

Researchers used numerical particle-tracking experiments to examine how sinking microplastics are retained in well-mixed estuaries under varying tidal and freshwater flow conditions. They found that over 90% of sinking particles were retained in the estuary, with retention rates highly sensitive to particle density and size. The study confirms that estuaries can act as significant accumulation zones for microplastics, trapping particles before they reach the open ocean.

Benthic species as mud patrol ‐ modelled effects of bioturbators and biofilms on large‐scale estuarine mud and morphology

An eco-morphodynamic model of an idealized estuary showed that bioturbating macroinvertebrates and microphytobenthos biofilms have opposing effects on mud erodibility and estuarine morphology, with bioturbation increasing net mud export and biostabilization reducing erosion.

Combined effects of microplastics and nitrogen on bivalve‐mediated biogeochemical cycling

Researchers investigated the combined effects of microplastic pollution and excess nitrogen on coastal sediment ecosystems mediated by bivalves. They found that when both stressors were present together, nitrogen processing responses changed in ways not seen with either stressor alone, and sediment health conditions worsened significantly. The study suggests that multiple environmental stressors can interact in unexpected ways that single-stressor studies would miss.

Research into land atmosphere interactions supports the sustainable development agenda

This paper outlines priority research directions for the integrated Land Ecosystems Atmospheric Processes Study network, focusing on how land-atmosphere interactions support sustainable development goals. Researchers emphasize the importance of land-based strategies like tree planting and bioenergy crops to address climate change and biodiversity loss. The study highlights how understanding these interactions can inform policies related to environmental quality, including the transport of airborne pollutants.

Quantifying ingested debris in marine megafauna: a review and recommendations for standardization

This review examined published methods for quantifying ingested plastic debris in marine megafauna — including whales, turtles, and sharks — and found wide variation in reporting practices. The authors propose standardized protocols for sample collection, processing, and data reporting to enable meaningful comparisons across species and regions.

Differences in microplastic degradation in the atmosphere and coastal water environment from two island nations: Japan and New Zealand

Researchers compared structural differences between microplastics collected from atmospheric and coastal water environments in Japan and New Zealand, finding distinct weathering signatures that reflect the different degradation processes operating in each environmental compartment.

Sông Sài Gòn: Extreme Plastic Pollution Pathways in Riparian Waterways

Researchers in Vietnam tracked a GPS-equipped device designed to mimic a floating plastic bottle as it traveled through the Saigon River and surrounding waterways. The tracker provided high-resolution data on how plastic moves through urban tidal systems, revealing key pathways and retention zones where litter accumulates. The project also ran during Vietnam's Plastic Awareness Month to boost public engagement, combining real science with outreach. The data collected can help authorities identify the best places to intercept plastic before it reaches the ocean.

Microplastic pollution distribution: Differences between marine reserves and urbanised areas

Researchers compared microplastic concentrations in seafloor sediment cores from a developed coastal town and a nearby marine reserve in New Zealand, finding — surprisingly — four times more microplastic accumulation near the protected reserve than near the urban area. The finding suggests that ocean currents and seabed disturbance patterns, rather than just proximity to human activity, determine where microplastics concentrate on the seafloor.

Strategies to Manage Ecotourism Sustainably: Insights from a SWOT-ANP Analysis and IUCN Guidelines

Not relevant to microplastics — this paper uses a SWOT-ANP decision framework to analyze ecotourism management strategies in Iranian protected areas.

A tale of two stressors: nitrogen, microplastics, and their influence on estuarine organic matter degradation

Less than 5mm — The unseen threat: A practice-led investigation into micro-plastics effects on coral reefs

This practice-led design research project used risograph printing and laser cutting to create a publication that communicates the threat of microplastics to coral reef ecosystems, exploring how communication design can shift public mentality away from single-use plastic consumption toward conscious consumer behavior.

Making a material difference: The impacts of a change to plastic‐free clothing

Researchers developed an economy-wide model to assess the impacts of a mandatory shift to plastic-free clothing in response to UN Resolution 5/14 calling for an end to plastic pollution. The model examined how a tax on synthetic fibres would affect the clothing industry, microplastic release from textile washing, and broader economic outcomes across supply chains.

Examining Practices of Apparel Use and End of Life in New Zealand

Researchers investigated laundry practices, garment lifetime wear, and end-of-life disposal behaviors for woollen and synthetic-blend knitted jumpers in New Zealand through an anonymous online survey. Results showed woollen garments were worn more times over their lifetime and washed less frequently than synthetic blends, with important implications for microplastic fiber shedding and textile waste in the region.

The Plastic Intensity of Industries in the USA: The Devil Wears Plastic

Researchers used US input-output data to calculate the plastic intensity of 415 non-plastic industries across 13 polymer types, finding that clothing and fabric manufacturing are the most plastic-intensive sectors, a pattern consistent with the prevalence of textile-derived microplastics in waterways and suggesting that consumer-facing plastic bag policies fail to address the most significant pollution pathways.

Sustainability within Aotearoa New Zealand's aerospace sector: current state and implications for the future

Researchers surveyed and interviewed stakeholders in Aotearoa New Zealand's growing aerospace sector, finding that environmental sustainability and compliance with Te Tiriti o Waitangi are consistently deprioritized in favor of economic growth, with environmental challenges treated as technical rather than systemic issues.

Navigating spaces between conservation research and practice: Are we making progress?

This review examined progress in bridging the gap between conservation research and conservation practice over a decade, finding persistent mismatches remain between scientific findings and field implementation. While not directly about microplastics, this methodological discussion is relevant to applying research on plastic pollution impacts to real-world policy and management decisions.