Welcome to the plastisphere – the world of things that live on plastics. Much of the debris we’ve bee finding hosts little worlds of algae, barnacles and worms, sheltering pelagic (open sea) crabs and even the odd bivalve. In the image to the left, Marcus is breaking apart a chunk of polyurethane foam to see who is home. Looks like goose-neck barnacles again.
Scientists studying the plastisphere are interested in the organisms inhabiting plastic debris. There are ongoing debates over whether certain microbes might be eating plastic or whether organisms are transformed by their synthetic homes. (Are algae just occupying body-shaped divots in plastics or did they make them?) The plastisphere is also of interest to marine biologists studying ‘rafting’ – organisms hitching rides across the sea on floating materials. Historically, this has meant mats of greenery, bits of wood or other organic flotsam, but plastic is now a major, and much more durable, part of the mix. Yesterday Hank found a found a coastal oyster (the pacific kind, Native to Asia, but introduced to North America) stowed away on a foam-based ‘rubber’ mat over a thousand miles from shore.