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

Julysub 2020

geo line break v3

Free eBooks - Geographical Newsletter

geo line break v3

geo line break v3

University of Winchester

geo line break v3

EDUCATION PARTNERS

Aberystwyth University University of Greenwich The University of Derby

TRAVEL PARTNERS

Ponant

Silversea

Travel the Unknown

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...

Oceans

Researchers have revealed just how many polluting microfibres are released…

Wildlife

Increasing reports of seized jaguar fangs and skin suggest that…

Geophoto

Forced isolation has given many of us the chance to…

Oceans

A fifth of the ocean floor has now been mapped,…

Wildlife

Four ex-circus lions discovered in France are due to be…

Oceans

A roundup of some of the top discussions from the…

Energy

The agave plant, used to make Tequila, has proven itself…

Climate

Concerns about the ozone hole have diminished as levels of…

Wildlife

In the Eastern Cape of South Africa, Munu – a…

Geophoto

Photography competition, Earth Photo, returns for the third year with…

Oceans

A new study reveals the process behind the strange phenomenon…

Wildlife

Hunting is a topic that attracts polarised viewpoints. But as…

Oceans

A compilation of 50-years worth of data on human activity…

Wildlife

From the US to the Mediterranean, herds of goats are…

Wildlife

Meet the 2020 Whitley Award winners

Wildlife

Protecting the most famous members of the animal kingdom may…