April 22, 2026•1 min read•from Frontiers in Marine Science | New and Recent Articles

Flood-driven microplastics pollution and its ecotoxicological footprint in shallow marine habitats

Our take

The increasing contamination of aquatic organisms by microplastics (MPs) poses significant ecological challenges, particularly in shallow marine habitats. This review examines the impact of extreme hydrologic events, such as severe flooding, on the transport and ecological risks associated with MPs. Riverine pathways serve as conduits for plastic pollution, linking terrestrial sources to biodiverse coastal ecosystems. Evidence indicates that intense precipitation events mobilize stored microplastics, leading to brief but concentrated pulses of contamination.

Flood-driven microplastics pollution and its ecotoxicological footprint in shallow marine habitats

The increasing prevalence of microplastic (MP) pollution in our oceans is a pressing environmental challenge that demands urgent attention. A recent review titled "Flood-driven microplastics pollution and its ecotoxicological footprint in shallow marine habitats" sheds light on an often-overlooked aspect of this crisis: the role of extreme hydrologic events, such as flooding, in mobilizing microplastics from terrestrial environments into coastal waters. Understanding this dynamic is crucial, particularly as climate change intensifies the frequency and severity of such events. This review emphasizes the need for a more nuanced approach to monitoring and assessing the ecological risks posed by microplastics, especially in river-dominated coastal regions, which are vital for biodiversity and essential ecosystem processes.

The findings underscore that severe precipitation and flooding can rapidly displace microplastics accumulated in soils, sediments, and urban landscapes. This phenomenon leads to concentrated pulses of microplastics entering shallow coastal ecosystems, briefly elevating contamination levels and setting the stage for long-term ecological consequences. The urgency of this issue is echoed in related discussions, such as those in the article "Exposing estuarine regions as microplastic traps: modeling transport pathways and accumulation hotspots in the Minho Estuary (Portugal-Spain)." Both pieces highlight how microplastics not only disrupt marine life but also compromise the delicate balance of coastal ecosystems that serve as critical habitats for a plethora of species.

The implications of this research extend beyond scientific inquiry; they challenge policymakers and environmental managers to rethink current monitoring frameworks. Traditional methods may not adequately account for the rapid and episodic influx of microplastics following extreme weather events. As the review suggests, integrating extreme-event dynamics into monitoring procedures and ecological risk assessments is essential for effectively managing and mitigating microplastic pollution. This shift is particularly pertinent as we strive to safeguard marine biodiversity and ecosystem services against the backdrop of climate change.

Furthermore, the issue of microplastics is emblematic of a broader environmental narrative. It reflects our relationship with plastic as a society and the pressing need for systemic change—both in our consumption patterns and in the management of waste. As we move forward, it is vital to foster a collaborative approach that involves scientists, policymakers, and the public in addressing this multifaceted challenge. The urgency of the situation compels us to ask: How can we enhance our understanding of microplastic transport and its ecological impacts in light of increasing extreme weather events?

As we delve deeper into the complexities of microplastic pollution, we must not lose sight of the collective responsibility we share in stewarding our oceans. The call to action is clear: we must prioritize the integration of innovative research findings into actionable policies that protect our marine ecosystems. Only then can we begin to mitigate the long-term effects of microplastics and ensure the health of our oceans for future generations.

Microplastics (MPs) contamination of aquatic organisms is on the rise globally. The effect of extreme hydrologic events on the movement MPs and ecological hazards is poorly understood. Riverine transportation routes connect the plastic inputs on land to the shallow marine ecosystems, which contribute to the high biodiversity and the essential ecosystem processes. This review provides global evidence on flood-driven microplastic inputs into shallow coastal waters, with particular emphasis on river-dominated coastal regions and flood-prone environments. Evidence suggests that severe precipitation and flooding events rapidly mobilise the plastically built-up stores in the soils, sediments, and urban landscapes, resulting in concentrated but brief microplastic pulses that increase background levels of contamination in coastal waters over time. In order to sufficiently assess and control MPs pollution in coastal ecosystems with high risks of floods, the present review shows that extreme-event dynamics should be included in the monitoring procedures and ecological risk assessment.

Read on the original site

Open the publisher's page for the full experience

View original article →

Exposing estuarine regions as microplastic traps: modeling transport pathways and accumulation hotspots in the Minho Estuary (Portugal-Spain)The ubiquitous presence of microplastics (MPs) in the marine environment has become an increasingly evident crisis. Yet, fundamental questions regarding their origin, transport pathways and fate remain largely unanswered, particularly in estuaries. While international policy frameworks to reduce plastic pollution at their source are negotiated, targeted interventions are critically needed to prevent MPs from entering the ocean. Wastewater treatment plants (WWTPs) serve as essential infrastructures for improving freshwater quality, however, their efficiency in removing MPs is limited. Many WWTPs discharge their effluents into freshwater tributaries, making estuaries important sinks of MPs’ pollution, but the MPs’ dynamics in these systems remains poorly investigated and highly depends on the type of estuary. This study evaluates how varying river discharges and tidal conditions influence the spatial distribution, transport mechanisms and retention of MPs in estuarine environments. Integrating field observations with a Lagrangian particle tracking model coupled to a depth-averaged 2DH hydrodynamic model, the Minho Estuary (Portugal) is used as a case study to observe how contrasting hydrodynamic conditions affected the dynamics of MPs. The numerical models explicitly resolved the distribution of MPs across the lower estuary, revealing key mechanisms controlling MPs’ transport, determining whether the estuary functions as source or sink, and identifying concentration hotspots persistent across all conditions. While the study provides further evidence of the extensive presence of MPs in these systems, the findings demonstrate that turning this environmental crisis into targeted solutions represents scalable intervention strategies with direct, meaningful impacts on the reduction of marine MPs in the environment.

Tagged with

#marine biodiversity

Flood-driven microplastics pollution and its ecotoxicological footprint in shallow marine habitats

Related Articles

Tagged with