Our directory of things of interest

University Directory

Mediterranean facing plastic crisis

Mediterranean facing plastic crisis Gordana Sermek
07 Apr
2015
Human pressure is adding significant plastic pollution to the Mediterranean Sea, with total estimates ranging from 1,000 to 3,000 tons

A new study in the journal PLOS ONE has revealed the extent to which the Mediterranean is becoming filled with discarded plastic, with plastic density estimates as high as one item per 4m2. The study concludes that the total amount of floating plastic could be as high as 3,000 tons.

The sampling process took place in twenty-eight sites across the Mediterranean, including the waters of Spain, France, Italy, Greece, and Cyprus.

These results also confirmed that the Mediterranean has one of the highest concentrations of plastic in the world, with only the north and south gyres (rotating ocean currents) of the Atlantic Ocean containing a larger area of floating plastic. The next highest concentrations can be found in the gyres of the Indian and Pacific Oceans. 

plasticchartRanges of surface plastic concentrations measured in the Mediterranean Sea, and reported for the open ocean (Image: PLOS ONE)

‘Plastic concentrations in the Mediterranean are comparable to those found in the five subtropical gyres,’ says Andrés Cózar from the University of Cádiz, Puerto Real, Spain, and lead author of the study. ‘We still know little about other marginal seas, such as the China Sea, Red Sea, North Sea. But now we know that the Mediterranean shows one of the highest levels of plastic pollution in the world.’

The study suggests that the Mediterranean’s high concentration of plastics could be a result of, firstly, the high population around the Sea, discarding plastic items directly into the Mediterranean. While noting that there have been no proper estimates for the exact volumes of this plastic, the study points out that the Danube is ‘conservatively estimated’ to be depositing 1,533 tons of plastic into the Black Sea each year, a figure which the Nile alone could well be matching into the Mediterranean.

A second source could be from the Atlantic, where ‘light Atlantic water’ flows over the ‘denser, deeper outflow of Mediterranean water’ through the Strait of Gibraltar, resulting in the Mediterranean acting as a ‘convective basin’ for the Atlantic.

The Mediterranean Sea represents less than one per cent of the global ocean area, but is home to between four and 18 per cent of all marine species. Fishing industry, aquaculture, maritime transport and coastal tourism are all key sources of income for the Mediterranean nations, all of which could be significantly impacted by the growing problems associated with marine plastic pollution.

Related items

NEVER MISS A STORY - Follow Geographical on Social

Want to stay up to date with breaking Geographical stories? Join the thousands following us on Twitter, Facebook and Instagram and stay informed about the world.

More articles in NATURE...

Wildlife

An overlap between populations of grizzly bears and Indigenous groups…

Oceans

Climate change is having a huge impact on the oceans,…

Climate

The first COP26 draft agreement has been released

Climate

Marco Magrini explores the complex issue of carbon markets –…

Climate

The youth found marching outside the COP26 conference in Glasgow…

Climate

Energy day at COP26 was all about coal. Marco Magrini…

Climate

The world is reliant on the climate models that forecast…

Climate

Geographical editor, Katie Burton, spends the day at COP26: finance…

Climate

Lawyers are using the power of the courts to challenge…

Climate

Mike Robinson, chief executive of the Royal Scottish Geographical Society…

Climate

Will China's climate pledges be enough to achieve Xi Jinping's…

Climate

Net zero. It’s the phrase that polarises scientists and environmental…