Death by plastic: Bay’s sea turtles, marine mammals imperiled by growing debris
By Tamara Dietrich
For the Bay Journal News Service
Six years ago, a young, emaciated sei whale that normally inhabits the deep waters of the Atlantic was spotted swimming erratically in tidal rivers and creeks near the mouth of the Chesapeake Bay.
For about a week, a team from the Virginia Aquarium & Marine Science Center in Virginia Beach kept tabs on it, trying to keep it safe from boat strikes, hoping it would find its way back to the ocean.
But one morning the whale, a 46-foot female, was found dead in the shallows of a creek off the Elizabeth River. A necropsy found that the animal had ingested a large, sharp shard of a plastic DVD case that punctured its stomach and led to its death.
Mark Swingle, chief of research and conservation at the aquarium, is a longtime member of its Stranding Response Team and sees firsthand the impacts of plastic debris on marine life.
But the sei whale, he said, was “probably the most dramatic example that I’ve seen in my 30 years here.”
The saga of the sei ran in countless newspapers and even National Geographic. Now it’s part of a report just released by the DC-based advocacy group Oceana, cataloging how plastic pollution in U.S. waters impacts sea turtles and marine mammals.
Choked, Strangled, Drowned: The Plastics Crisis Unfolding in our Oceans is the first compilation of data spanning 2009 to early 2020 from 51 marine life groups and government agencies.
But authors say what they’ve learned is but a “partial snapshot of a staggering problem.”
“We find news stories here and there about whales turning up on beaches and all sorts of things pulled out of stomachs and very sad tales, but those are just little synopses of stories,” co-author Kim Warner said. “As we try to assemble data, you can get a more comprehensive look at a problem and try and devise strategies for recovery.”
According to the report, about 15 million tons of plastic trash wash into the ocean every year —about two garbage trucks’ worth every minute. That deluge is projected to triple by 2040. Meanwhile, plastic production runs at roughly 400 million metric tons annually, and is on track to quadruple by 2050.
Only about 9% of plastics are recycled, the report states. Most of what ends up in the ocean and on coastal beaches are single-use plastics, like straws, bags, bottles, balloons and foam food containers.
By far the leading cause of death by plastic among marine animals, the report found, is when they mistake plastics for food — a sea turtle thinks a plastic grocery bag is a jellyfish, a hatchling with its egg tooth still intact gobbles up a bellyful of bright plastic bits, a filter-feeding baleen whale scoops up plastic shards or pliable shreds floating in the water column. It can be the worst and last mistake of the animal’s life.
Oceana considers its findings just the tip of the iceberg. They found records of almost 1,800 animals from 40 different species that had swallowed or been entangled in plastic in U.S. waters. Turtles disfigured from ingesting balloons that twisted up their intestines, seals strangled by packing straps, whales starved to death with a bellyful of plastic.
Like other estuaries, the Chesapeake Bay is a sink for plastic pollution and home to countless creatures at risk because of it.
Dangers in the Bay
Of the seven species of sea turtles in the world, five of them inhabit the Bay, if only seasonally. Most are juvenile loggerheads or Kemp’s ridleys; all are either threatened or endangered. In warmer months, it’s not unusual for 10,000 sea turtles to use the Bay as foraging grounds.
Among marine mammals, the bottlenose dolphin is known to cruise all the way to the Upper Bay, according to Jennifer Dittmar, director of animal rescue at the National Aquarium in Baltimore. They’ve also seen Florida manatees and harp and harbor seals. Humpbacks and other whales are occasional visitors.
In her 15 years at the aquarium, Dittmar has helped with numerous necropsies at the request of the state Department of Natural Resources, which handles marine animals that wash up on Maryland’s coasts.
“And almost every single dolphin or whale necropsy that I have assisted them with, we have found plastics, either in the stomach or the intestines — somewhere along the GI tract,” Dittmar said.
“We’ve seen things like plastic prescription bottles, pieces of plastic — hard plastic or softer plastic. We’ve seen balloon-like material. We’ve even seen things like rubber fishing gloves like watermen use.”
While plastic pollution is a regular feature along the Bay shorelines, there’s still inadequate research detailing its distribution.
Meredith Evans Seeley, a doctoral candidate and researcher at the Virginia Institute of Marine Science in Gloucester Point, is among those trying to learn more. Recently, while surveying a small, uninhabited marsh island at the mouth of the York River, she found “all sorts of plastic trash” on its shores.
“It’s surprising how much accumulates in certain spots,” Seeley said. “It can come in on a big tide or a big storm wave and then just never leave. . . . Globally, but especially in the Bay, plastics pollution is not going down. It’s only going up.”
A new and disturbing trend, experts say, is a new form of plastic litter: face masks and gloves used during the coronavirus pandemic.
Balloons in particular are chronically insidious, said Swingle of the Virginia Aquarium. They can travel far from where they were released and wreak all kinds of havoc once they come back down. In a decade of annual Bay cleanups, he said, they’ve found balloons from neighboring states and as far away as Kansas, identifiable by personalized inscriptions.
“Most people don’t understand that, when you release a balloon, you’re really littering,” Swingle said.
Like their colleagues in Maryland, Virginia Aquarium staff routinely find plastics inside sick, dying and dead animals. They found 59 different pieces of balloons, candy wrappers and other plastic in the stomach of a deceased harbor porpoise.
“It’s always hard to see this,” Swingle said.
A Kemp’s ridley turtle had ingested numerous bits of balloon and string, which caused the animal’s intestines to bunch up, reducing it in size to about a third of its length, Warner said.
“So this animal probably died a very painful death,” she added.
The aquarium staff also found a green sea turtle that was underweight and apparently unable to feed, but luckily had a better fate.
“After doing an internal examination, we found that its stomach was basically plugged up with plastic and debris,” Swingle said. So they went in with an endoscope camera and removed balloons, plastic mesh and other plastic bits too degraded to identify. The animal was rehabilitated and released.
Turn off the faucet
When plastic degrades over decades or centuries, it doesn’t simply disappear— it breaks down into tiny microplastics. Microplastics are found all over the world now, from the deepest ocean depths to the highest peaks. They’re also found in human organs and tissue.
“Part of what we have to think about with plastic pollution,” Seeley said, “is the life cycle of the plastics itself.”
Oceana and marine experts say it’s critical to reduce single-use plastics, the biggest culprits. They believe consumers will be receptive.
A pilot project that the University of Maryland Center for Environmental Science conducted in Solomons Island, MD, for instance, found that restaurants and their customers are happy to switch to reusable straws, cutlery and food containers if they’re given the option and understand the difference it makes.
Municipalities can be open to change, too. Washington, DC, banned plastic straws and foam containers and now taxes plastic grocery bags.
Virginia, which has outlawed releases of 50 balloons or more, will consider a bill in 2021 that would fine intentional releases of 49 or fewer. Swingle said the bill stands a good chance, now that the trade and lobby group The Balloon Council no longer opposes it. Earlier this year, though, state lawmakers opted not to tax plastic carryout bags after opposition from plastics manufacturers.
And on Oct. 1, Maryland became the first state to ban foam food containers. Beginning in January, single-use plastic bags will be banned in Baltimore, while the General Assembly will consider taking the ban statewide. It’ll also consider banning intentional balloon releases; the more progressive Montgomery County has already done so.
Warner considers such moves a solid step. More important is reducing the supply of plastics.
“They really need to stop the tap,” Warner said. “When a bathtub is overflowing, you don’t reach for the mop — you reach for the tap. And that’s what we need to do. We need local, state, federal and maybe global agreements, because it is a local, national and global problem.”
To read the Oceana report in its entirety, go to USA.Oceana.org/ChokingOnPlasti
Bay Journal contributing writer Tamara Dietrich is based in Tidewater Virginia. This article was first published in the Bay Journal and was distributed by the Bay Journal News Service.