In a world heavily dependent on plastic, one of the biggest challenges remains its resistance to decomposition. But scientists at the University of Hawaii may have uncovered a game-changing ally—marine fungi.
Plastic is now the leading pollutant in our oceans, and astonishingly, plastic surfaces have become one of the fastest-growing habitats in marine environments. However, researchers working off the coast of O‘ahu have identified a unique species of fungi that can consume polyurethane, one of the most commonly used plastics.
This breakthrough could potentially pave the way for a novel biological solution to plastic waste, offering a natural method to break down plastics that usually linger in ecosystems for centuries. Although initial findings are encouraging, experts emphasise that biodegradation alone won't solve the plastic crisis—reducing plastic production must also be a top priority.
Fungi: Nature's Secret Weapon Against Plastic
While various microbes, including bacteria and land-based fungi, have already been studied for their plastic-eating capabilities, this marks the first significant investigation into marine fungi as a tool to combat plastic waste.
According to researchers at the University of Hawaii at Mānoa, these marine fungi represent an unexplored but promising avenue for plastic degradation—especially considering how plastics, once exposed to environmental forces like sunlight and friction, fragment into dangerous microplastics rather than fully breaking down.
Marine biologist Ronja Steinbach, who led the study as part of her undergraduate research, explained:
"Plastic in the environment is incredibly persistent—current technologies struggle to break it down."
Her team collected fungi samples from various nearshore ecosystems—sand, corals, seaweed, and sponges—and tested them in controlled lab settings. Astonishingly, over 60% of the fungi strains displayed some ability to break down plastic, transforming it into fungal biomass.
Speeding Up Nature's Plastic Eaters
To test the fungi's potential, researchers placed polyurethane samples in petri dishes and observed whether the fungi could consume them. They then selected the fastest-acting strains, subjecting them to repeated exposure to polyurethane to see if they could improve their plastic-eating abilities.
The results were promising. Some fungi boosted their degradation rates by 15% within just three months, showing a remarkable ability to adapt and enhance their plastic-consuming efficiency.
"We were amazed by how quickly some of the fungi adapted," said Steinbach. "It's rare to see such a rapid evolutionary response in such a short timeframe."
Anthony Amend, a professor at the Pacific Biosciences Research Center, explained:
"Fungi have unique abilities to digest tough substances—like wood or chitin—so it makes sense they could tackle plastics too."
Now, researchers aim to understand how these fungi break down plastics at the cellular and molecular levels. They also hope to identify other marine fungi capable of attacking different, more stubborn types of plastic pollutants.
A Step Forward, But Not the Only Solution
Despite the excitement, experts caution that biodegradable solutions should be part of a larger strategy to tackle plastic pollution.
Dr. Antaya March, director of the Global Plastics Policy Centre at the University of Portsmouth, applauded the discovery as "innovative and promising" but stressed the need for policy-level action:
"While technologies that manage plastic waste are crucial, we cannot ignore the need to curb plastic production itself."
March advocates for a balanced, multi-pronged approach, combining technological breakthroughs with strong global and national policies to limit plastic production. She emphasised that reducing reliance on single-use plastics and shifting consumer behaviour is essential to prevent more plastic from reaching ecosystems in the first place.
These concerns are at the heart of current debates surrounding the Global Plastics Treaty, which aims to create international agreements to combat plastic pollution.
Looking Ahead
Although still in early stages, the discovery of plastic-eating marine fungi could become a key part of future clean-up efforts in oceans and on beaches. Yet, as experts remind us, technological innovations need to be matched with strong preventive measures—because the best way to address plastic pollution is to stop it at its source.