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Sail-World.com : The Ocean 'Plastisphere' threat - where plastic bags begin new life
The Ocean 'Plastisphere' threat - where plastic bags begin new life

'Rubbish creates its own plastisphere'    . ©    Click Here to view large photo

If any leisure sailor still needs convincing not to throw your plastic into the water, this article will do it. There's a new word for an area of ocean, the 'Plastisphere'. Scientists are revealing how microbes living on floating pieces of plastic marine debris affect the ocean ecosystem, and the potential harm they pose to invertebrates, humans and other animals.

New research presented at the 2014 Ocean Sciences Meeting, just held in Hawaii in 2014 delves deeper into the largely unexplored world of the 'Plastisphere' - an ecological community of microbial organisms living on ocean plastic that was first discovered last year.

When scientists initially studied the Plastisphere, they found that at least 1,000 different types of microbes thrive on these tiny plastic islands, and that they might pose a risk to larger animals, including invertebrates and humans. The original studies also showed that the Plastisphere's inhabitants included bacteria known to cause diseases in animals and humans.

Since then, researchers have been trying to figure out why these potentially dangerous bacteria live on the Plastisphere, how they got there and how they are affecting the surrounding ocean.

New evidence suggests that 'super-colonizers' form detectable clusters on the plastic in minutes. Other findings indicate that some types of harmful bacteria favor plastics more than others. And, scientists are exploring if fish or other ocean animals may be helping these pathogens thrive by ingesting the plastic. That could allow bacteria to acquire additional nutrients as they pass through the guts of the fish, said Tracy Mincer, an associate scientist at Woods Hole Oceanographic Institution in Woods Hole, Mass.

Revealing this information could help scientists better understand how much of a potential threat these harmful bacteria pose and the role the Plastisphere plays in the larger ocean ecosystem, including its potential to alter nutrients in the water. That information could also help reduce the impact of plastic pollution in the ocean - for instance, if plastics manufacturers learned how to make their products so they degrade at an optimal rate, Mincer said.

'One of the benefits of understanding the Plastisphere right now and how it interacts with biota in general, is that we are better able to inform materials scientists on how to make better materials and, if they do get out to sea, have the lowest impact possible,' said Mincer, who discovered the Plastisphere last year along with Linda Amaral-Zettler at the Marine Biological Laboratory (MBL) and Erik Zettler at the SEA Education Association, both also in Woods Hole.

Rubbish creates its own plastisphere  .. ©   Click Here to view large photo

The Plastisphere team presented their latest research on these communities at the 2014 Ocean Sciences Meeting, co-sponsored by the Association for the Sciences of Limnology and Oceanography, The Oceanography Society and the American Geophysical Union.

Other new results include discoveries about how the plastic is colonized and how it interacts with other marine organisms. Yet additional findings shed light on the similarities and differences between Plastisphere communities in different locations and on different types of plastic.

This research could help scientists determine the age of plastic floating in the ocean, which could help them figure out how it breaks down in the water. It could also potentially aid in determining where the plastic debris came from, and how the plastic and the microbes that live on board could impact organisms that come into contact with them, the scientists said.

'It is clear,' said Amaral-Zettler, 'that the Plastisphere definitely has a function out there in the ocean' and these experiments seek to quantify what it is.

www.sciencedaily.com
.


by Media Services/Sail-World Cruising


  

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9:28 PM Sat 3 May 2014GMT


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