Plasticrust: Blend of plastic and rock is forming in Portuguese Island

by admin

Researchers have identified a new, and perhaps more permanent type of plastic pollution, one that incorporates itself right into the rocky shoreline called ‘plasticrust’. It is a veneer of plastic encrusted right onto rocks of the shore.

Ignacio Gestoso, a marine ecologist at the MARE-Marine and Environmental Research Center on the Portuguese island of Madeira, first noticed the strange crusts on the volcanic island’s shoreline rocks in 2016. The light blue films were plastered onto the rock like old chewing gum grafted onto a sidewalk. 

The next year, the researchers saw that the crusts were still there. Early this year, they returned to the spot to find more area covered in the mysterious substance, now in multiple colors. So, the team decided to take measurements and collect more samples to see what they were dealing with.

The researchers found that over three years, the crusts had gone from a single sighting to covering nearly 10 percent of the rocks’ surfaces by randomly sampling rocky areas of the shoreline. Chemical analysis of the stuff revealed that it was polyethylene, an extremely common plastic often used in single-use packaging and food containers.

In a paper published this month in the journal Science of The Total Environment, Gestoso and his team formally dubbed the phenomenon as “plasticrust,” a never-before-seen form of plastic pollution. Tragically, it’s not even the first type of totally new material our species has birthed into the natural environment with our plastic pollution. Six years ago, researchers found an unholy merger of plastic and rock on a Hawaiian beach, the result of campfires melting plastic waste and bonding it with sand and pebbles. But unlike this “plastiglomerate,” Gestoso thinks plasticrust was forged by water, not fire.

On Madeira, the plasticrust is gradually replacing natural biological crusts and films on the rocks—surfaces that intertidal animals like barnacles and snails adhere to and feed from. Gestoso’s team found that an algae-eating species of winkle sea snail was nearly as abundant on the plasticrusts as it was on normal surfaces, suggesting that the mollusks might not avoid plasticrusts, but graze on the algae that settle right on top. That raises the possibility that they’re ingesting some of the plastic in the process.

Gestoso says future studies should figure out just how much plastic the grazing snails are taking up to evaluate the potential risk plasticrusts pose. He also says he and his team are planning to conduct comprehensive field surveys for plasticrusts in the region to get an idea of where the stuff is accumulating. 

Gestoso hopes that the plasticrust’s discovery can contribute to awareness about the consequences of plastic waste, as unsettling as the news is. “As a marine ecologist researcher, I would prefer to be reporting other types of findings, and not a paper describing this sad new way of plastic pollution,” Gestoso said. “Unfortunately, the magnitude of the problem is so huge that few places are free of plastic pollution.”

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