The story to this point:
Microplastics, particularly nylon fibres, appear to be current fairly sparsely in Chennai’s seashore sediments however may nonetheless wreak long-term ecological injury, new analysis has cautioned. A research by researchers at V.O. Chidambaram College in Thoothukudi examined the abundance, sources, and ecological dangers of microplastics from seashore sediment samples from 15 websites alongside the Chennai coast. The findings present fibres dominating, with most particles smaller than 1000 µm.
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Why does low abundance not imply low danger?
“This study is important because it shows that microplastics are already present in Chennai’s beach sediments, even if we don’t always see them,” Sekhar Selvam, senior assistant professor on the Department of Geology, V.O. Chidambaram College, Thoothukudi, stated. “What is new here is that the problem is not just the amount of plastics but also the type of plastics. We found that most of the microplastics are nylon fibres, which are more harmful than many other plastics.”
In different phrases, despite the fact that Chennai’s seashores have fewer microplastics than many international ones, the danger to marine life stays vital.
“This study helps us understand that early-stage pollution can still cause long-term damage if ignored,” Dr. Selvam stated.
While there have been a number of research worldwide about microplastics, knowledge from quickly urbanising tropical coastal areas like Chennai stay scarce, Shaji Erath, professor of geology on the University of Kerala, Thiruvananthapuram, stated.
He added that the brand new research thus “sheds new light by demonstrating that low overall microplastic abundance does not necessarily imply low ecological risk.”
An further perception from the research is the disconnect between abundance-based assessments and risk-based evaluations, Mr. Erath stated. Traditional monitoring usually focuses on microplastic counts alone.
However, the research has proven that polymer kind, form, and getting older traits are equally, if no more, necessary in figuring out ecological danger, he added.
What are the ecological issues?
Ecological issues within the research are mainly centred on marine life and coastal ecosystems, Dr. Selvam stated. Small organisms dwelling in seashore sand, akin to worms, crabs, and shellfish, simply ingest the small plastic fibres, which may go on to dam or injure their digestive tracts. Toxic compounds in plastics can even enter and poison their our bodies.
Over time, these plastics transfer up the meals chain and have an effect on fish, birds, and different animals “So even small particles can slowly disturb the entire coastal ecosystem,” Dr. Selvam stated.
According to Dr. Erath, apart from feeding by marine microorganisms, plankton, and marine animals, hazardous polymers akin to nylon pose greater ecological dangers as a consequence of their persistence, chemical components, and capability to adsorb pollution.
Fibre-shaped microplastics particularly can alter habitats by modifying the construction of sediments, affecting the benthic — or backside layer — of seas and the microbial communities there, he defined. There may be extended environmental publicity and long-distance transport of microplastics, highlighting the transboundary nature of microplastic air pollution.
“These concerns collectively threaten coastal biodiversity, ecosystem stability, and biogeochemical processes,” he stated.
How do human actions contribute?
Most microplastics discovered by the Chennai research staff have been clearly linked to human actions, in line with Dr. Selvam. These embody fishing, the place broken nets and ropes shed plastic fragments that break up into microplastics; artificial garments, which launch minuscule fibres when they’re washed; tourism and seashore use; and concrete sewage and stormwater drains that carry plastics into the ocean.
“Simply put, everyday plastic use on land eventually reaches the coast,” Dr. Selvam stated.
After reaching the coast, they reenter human our bodies by way of seafood contaminated by microplastics, amongst different pathways. Seafood particularly can ferry each dangerous chemical substances and disease-causing micro organism and different microorganisms into the physique, inflicting tissues to develop into infected and affecting the hormonal and immune techniques over longer intervals.
“Research is still ongoing, but the concern is clear: what pollutes the ocean can eventually affect our health,” Dr Selvam stated.
There have been related findings from another coasts. A July 2025 paper revealed in Environmental Earth Sciences studied choose seashores in southern Goa and reported that fibres have been the dominant microplastics form whereas colourless and white microplastics have been current in all sampled floor waters alongside seashores. The widespread plastics recognized included polyethylene, polypropylene, polystyrene, ethylene vinyl alcohol, and polyurethane.
Is it too late to behave?
Another research revealed in Environmental Quality Management in June 2024 assessed the prevalence of microplastics in water, sediments, and tissues of commercially necessary fish species alongside the Malabar coast in northwest Kerala. Six polymer varieties, together with excessive density polyethylene (HDPE), polyethylene terephthalate (PET), and nylon dominated. This research additionally reported a notable abundance of clear microplastic particles, measuring much less than 1 mm in diameter, significantly in gastrointestinal and gill tissues. The researchers emphasised “the urgent need for the implementation of effective regulatory measures to mitigate plastic pollution in marine ecosystems”.
“Chennai still has a chance to act early,” in line with Dr. Selvam. Right now, microplastic air pollution ranges should not so excessive in Chennai and higher waste administration, accountable fishing practices, and public consciousness can nonetheless forestall a a lot bigger problem sooner or later, in line with Dr. Selvam. “If we wait until the beaches are heavily polluted, it will be much harder and more expensive to fix. Early action is key.”
In the ultimate evaluation, the analysis has strengthened the necessity for well timed policy-driven interventions, together with higher stable waste administration, recycling of fishing gear, promotion of biodegradable options, and public consciousness, Dr. Erath stated.
“These measures are essential not only for Chennai but for rapidly developing coastal cities of both west and east coasts, where urbanisation-driven plastic pollution is likely to intensify.”
(T.V. Padma is a science journalist primarily based in New Delhi)
