Monday 14 June 2021

Plastic Hitchhiking?

In addition to the death and destruction it caused, Japan's 2011 tsunami swept an estimated 5 million tons of debris into the sea. The debris included lots of plastic, a material that persists for a long time. Studies have subsequently shown, that almost 300 native Japanese marine species, used the plastics to 'raft' considerable distances to Alaska, California and Hawaii (https://www.theguardian.com/environment/2021/jun/14/plastic-rafting-the-invasive-species-hitching-a-ride-on-ocean-litter). This 'mass rafting event' was carried out by sea anemones, gastropods (sea snails) and iospod crustaceans. The arrival of these non-native invaders, can endanger the survival of endemic species in their arrival sites. This is yet another problem, linked to pollution of marine habitats by plastics. Plastics can enter the oceans without involving tsunamis or other natural disasters. Humans are pretty good at litter dispersal. They are probably also, at the same time, dispersing marine organisms.

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