3rd September 2015

Plastic in 99 percent of seabirds by 2050

Researchers from the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and Imperial College London have assessed how widespread the threat of plastic is for the world's seabirds and found the majority of species have plastic in their gut.



A red-footed booby on Christmas Island, in the Indian Ocean. © CSIRO, Britta Denise Hardesty

The study, led by Dr Chris Wilcox with co-authors Dr Denise Hardesty and Dr Erik van Sebille and published this week in the journal PNAS, found that nearly 60 per cent of all seabird species have plastic in their gut. Based on analysis of published studies since the early 1960s, the researchers found that plastic is increasingly common in seabird's stomachs. In terms of individuals (as opposed to species), plastic was found in the stomach of less than five per cent of birds in 1960, rising to 80 per cent by 2010. It is estimated that 90 per cent of all seabirds alive today have eaten plastic of some kind.

The researchers predict that plastic ingestion will affect 99 per cent of the world's seabird species by 2050, based on current trends. These materials could remain in the biosphere until the year 2600 AD. This includes bags, bottle caps, and plastic fibres from synthetic clothes, which have washed out into the ocean from urban rivers, sewers and waste deposits. Birds mistake the brightly coloured items for food, or swallow them by accident, and this causes gut impaction, weight loss and sometimes even death.

"For the first time, we have a global prediction of how wide-reaching plastic impacts may be on marine species – and the results are striking," senior research scientist at CSIRO Oceans and Atmosphere Dr Wilcox said. "We predict, using historical observations, that 90 per cent of individual seabirds have eaten plastic. This is a huge amount and really points to the ubiquity of plastic pollution."

Dr Denise Hardesty from CSIRO Oceans and Atmosphere said seabirds were excellent indicators of ecosystem health: "Finding such widespread estimates of plastic in seabirds is borne out by some of the fieldwork we've carried out where I've found nearly 200 pieces of plastic in a single seabird."



Plastic fragments washing in the surf on Christmas Island, in the northeastern Indian Ocean. © CSIRO, Britta Denise Hardesty

The researchers found plastics will have the greatest impact on wildlife where they gather in the Southern Ocean, in a band around the southern edges of Australia, South Africa and South America. Dr van Sebille, from the Grantham Institute at Imperial College London, said the plastics had the most devastating impact in areas with greatest diversity of species.

"We are very concerned about species such as penguins and giant albatrosses, which live in these areas," Erik van Sebille said. "While the infamous garbage patches in the middle of the oceans have strikingly high densities of plastic, very few animals live here."

Dr Hardesty said there was still the opportunity to change the impact plastic had on seabirds: "Improving waste management can reduce the threat plastic is posing to marine wildlife," she said. "Even simple measures can make a difference, such as reducing packaging, banning single-use plastic items or charging an extra fee to use them, and introducing deposits for recyclable items like drink containers. Efforts to reduce plastics losses into the environment in Europe resulted in measureable changes in plastic in seabird stomachs within less than a decade, which suggests that improvements in basic waste management can reduce plastic in the environment in a really short time."

Chief Scientist at the US-based Ocean Conservancy, Dr George H. Leonard, said the study was highly important and demonstrated just how pervasive plastics were in the oceans: "Hundreds of thousands of volunteers around the world come face-to-face with this problem during the annual Coastal Cleanup events," he said. "Scientists, the private sector and global citizens working together against the growing onslaught of plastic pollution can reduce plastic inputs to help protect marine biodiversity."

This follows a similar study earlier this year that estimated between 4.8 and 12.7 million metric tons of plastic are entering the oceans each year.

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