Plastic trash in oceans harbor possibly dangerous microbes, study says

Scientists are revealing how microbes living on floating pieces of plastic marine debris affect the ocean ecosystem, and the potential harm they pose to invertebrates, humans and other animals. New research delves deeper into the largely unexplored world of what is being called Plastisphere, an ecological community of microbial organisms living on ocean plastic that was first discovered last year.

When scientists initially studied the Plastisphere, they found that at least 1,000 different types of microbes thrive on these tiny plastic islands and that they might pose a risk to larger animals, including invertebrates and humans. The original studies also showed that the Plastisphere’s inhabitants included bacteria known to cause diseases in animals and humans.

Since then, researchers have been trying to figure out why these potentially dangerous bacteria live on the Plastisphere, how they got there and how they are affecting the surrounding ocean.

New evidence suggests that colonizers form detectable clusters on the plastic in minutes. Other findings indicate that some types of harmful bacteria favor plastics more than others. And, scientists are exploring if fish or other ocean animals may be helping these pathogens thrive by ingesting the plastic. That could allow bacteria to acquire additional nutrients as they pass through the guts of the fish, said Tracy Mincer, an associate scientist at Woods Hole Oceanographic Institution in Woods Hole, Massachusetts.

Revealing this information could help scientists better understand how much of a potential threat these harmful bacteria pose and the role the Plastisphere plays in the larger ocean ecosystem, including its potential to alter nutrients in the water. That information could also help reduce the impact of plastic pollution in the ocean, Ms. Mincer said.

For instance plastics manufacturers could learned how to make their products so they degrade at an optimal rate, she added.

“One of the benefits of understanding the Plastisphere right now and how it interacts with biota in general, is that we are better able to inform materials scientists on how to make better materials and, if they do get out to sea, have the lowest impact possible,” said Ms. Mincer, who discovered the Plastisphere last year along with Linda Amaral-Zettler at the Marine Biological Laboratory and Erik Zettler at the SEA Education Association, both also in Woods Hole.

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