Plastic pollution is now one of the planet’s most pressing environmental concerns, yet its real impacts on the oceans remain only partially understood. A recent study from Tulane University (USA), published in Nature Sustainability, presents the first worldwide assessment of the ecological risks that plastic poses to marine ecosystems.
Contrary to the common belief that the greatest dangers are concentrated in the so-called “garbage patches,” the research shows that critical points are actually found in regions where plastic waste overlaps with high biodiversity and strong human pressure. This means that even waters with relatively lower plastic concentrations may face severe threats.
How plastic affects marine life
The scientists identified four main pathways of impact:
- Ingestion of plastic by fish, seabirds, and marine mammals;
- Entanglement in discarded fishing nets and lines;
- Transport of toxic pollutants that adhere to plastic waste;
- Release of harmful chemicals as plastic degrades over time.
To reach these conclusions, the team used advanced computational models, combining global data on plastic distribution, sensitive species, and associated contaminants.
The most vulnerable regions
The study highlights the following as high-risk zones:
- The North Pacific and North Atlantic at mid-latitudes;
- Parts of the Northern Indian Ocean;
- Several coastal areas of East Asia.
These regions are not only biodiversity hotspots but are also heavily impacted by fishing activities. One of the most concerning threats is “ghost gear” — fishing equipment such as nets, traps, and lines that are lost or abandoned, yet continue to capture and kill marine animals for years.
A warning that goes beyond the sea
The research also stresses that plastic acts as a kind of “conveyor belt” for dangerous pollutants, such as methylmercury (highly toxic to the nervous system) and the so-called “forever chemicals” (PFOS), persistent substances that accumulate in the marine food chain.
These pollutants not only harm marine ecosystems but also reach humans through seafood consumption, reinforcing the urgent need for a coordinated global effort to reduce plastic use and improper disposal.
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