A deep issue: Plastic waste in Pacific Ocean increases 100-fold

May 15, 2012

It's called the Great Pacific Garbage Patch. A swirling vortex of plastic bags, bottles and other debris, a landfill some say is twice the size of Texas.

While this area has brought concern for some time about its effects on marine life, researchers from the Scripps Institute of Oceanography found there's even more cause for worry. In a paper published by the journal Biology Letters , scientists from Scripps reported the amount of plastic debris in this part of the Pacific Ocean has grown 100-fold in the past 40 years.  SEAPLEX researchers collected an alarming amount of small bits of broken down plastic floating across thousands of miles of open ocean. Photo credit: Scripps Institution of Oceanography at UC San Diego

Even the researchers were shocked at this increase.

"To find this abundance of microplastics was surprising - we didn't expect this," Scripps graduate student Miriam Goldstein, lead author of the study, told PlasticsToday.

A plastic expedition in the pacific

In 2009, a group of graduate students led the Scripps Environmental Accumulation of Plastic Expedition (SEAPLEX) to the North Pacific Ocean subtropical gyre aboard the Scripps research vessel New Horizon.

During the voyage, the researchers, who concentrated their studies a thousand miles west of California, documented a high amount of human-generated trash, mostly broken down bits of plastic the size of a fingernail, floating across thousands of miles of open ocean.

"This paper shows a dramatic increase in plastic over a relatively short time period and the effect it's having on a common North Pacific gyre invertebrate," Goldstein said. "We're seeing changes in this marine insect that can be directly attributed to the plastic."

Since the pieces are so tiny, Goldstein said they weren't able to trace the waste to any particular type of plastic packaging.

"We can't tell what the objects are or how long that piece of plastic has been in the ocean," she said. "We are definitely interested in finding a way."

Examples of a not-yet-hatched sea skater (Halobates sericeus) egg (top), about the size of a grain of rice, and a hatched egg (bottom). Photo credit: Miriam Goldstein, Scripps Institution of Oceanography at UC San DiegoPerhaps one of the most alarming facts about this study is this sharp increase of small plastic debris in the Garbage Patch could have ecosystem-wide consequences that lead to changes in the natural habitat of animals such as the marine insect Halobates sericeus.

These "sea skaters" inhabit water surfaces and traditionally lay their eggs on floating objects such as seashells, seabird feathers, tar lumps, and pumice.

In the new study, researchers found that sea skaters have exploited the influx of plastic garbage as new surfaces for their eggs. This has led to a rise in the insect's egg densities in the North Pacific subtropical gyre.

 "The plastic debris is giving the insects places to lay their eggs as they don't have far to go to find an abundance of plastic," Goldstein said. "This is something that shouldn't be in the ocean."

In addition, data from the expedition found that 9% of the fish captured had plastic waste in their stomachs. That study estimated that fish in the intermediate ocean depths of the North Pacific Ocean ingest plastic at a rate of roughly 12,000 to 24,000 tons per year.

"I think everyone, activists, scientists, and the industry, agrees plastic has no place in ocean," she said.

Plastics industry works toward a solution

Keith Christman, managing director of plastics

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