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Home NEWS Science News Biology

Balloons the number 1 marine debris risk of mortality for seabirds

Bioengineer by Bioengineer
March 1, 2019
in Biology
Reading Time: 2 mins read
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Credit: Lauren Roman

The data showed that a seabird ingesting a single piece of plastic had a 20 per cent chance of mortality, rising to 50 per cent for nine items and 100 per cent for 93 items.

Led by IMAS-CSIRO PhD student Lauren Roman and published in the journal Scientific Reports, the study found that although hard plastic accounts for the vast majority of debris ingested it is far less likely to kill than soft plastics such as balloons.

“Marine debris ingestion is now a globally recognized threat,” Ms Roman said.

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

“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.

“Although soft plastics accounted for just 5 per cent of the items ingested they were responsible for more than 40 per cent of the mortalities.

“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.

“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,” Ms Roman said.

CSIRO co-author Dr Chris Wilcox said the approach taken in the study was first developed for turtles before being applied to seabirds.

“These two applications are the first time there has been a robust estimate of the impact of plastic ingestion on free living marine species,” Dr Wilcox said.

“This is a critical step in triggering action to address plastic pollution.”

Ms Roman said that although the study showed that soft items like balloons are more dangerous, all plastics pose a mortal threat to seabirds.

“If seabirds eat plastic their risk of mortality increases, and even a single piece can be fatal.

“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.

“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,” Ms Roman said.

###

Media Contact
Andrew Rhodes
[email protected]

Related Journal Article

http://dx.doi.org/10.1038/s41598-018-36585-9

Tags: BiologyEcology/EnvironmentMarine/Freshwater BiologyPollution/RemediationZoology/Veterinary Science
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