The Deadliest Plastic for Seabirds? Balloons

"Balloons, or balloon fragments, were the marine debris most likely to cause mortality, and they killed almost one in five of the seabirds that ingested them," said study author Lauren Roman, a Ph.D. student at the University of Tasmania's Institute for Marine and Antarctic Studies.

"Although soft plastics [like balloons] accounted for just 5 percent of the items ingested, they were responsible for more than 40 percent of the mortalities," she reported.

Roman and her team found that the risk of death for a seabird that ingested a single piece of plastic was 20 percent, rising to 50 percent for nine items, and 100 percent for 93 items.

"Marine debris ingestion is now a globally recognized threat," Roman said in a university news release.

"However, the relationship between the amount or type of debris that a seabird ingests and mortality remains poorly understood," she added.

"Among the birds we studied, the leading cause of death was blockage of the gastrointestinal tract, followed by infections or other complications caused by gastrointestinal obstructions," Roman said.

The study was published March 1 in the journal Scientific Reports.

"As similar research into plastic ingestion by sea turtles has found, it appears that while hard plastic fragments may pass quickly through the gut, soft plastics are more likely to become compacted and cause fatal obstructions," Roman explained.

But while "hard plastics are less likely to kill than soft plastics, they were still responsible for more than half of the seabird deaths identified in our study," she said.

"The evidence is clear that if we want to stop seabirds from dying from plastic ingestion, we need to reduce or remove marine debris from their environment, particularly balloons," Roman concluded.

More information

Debris Free Oceans has more on ocean debris.


Balloons deadliest risk to seabirds ingesting ocean plastic

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