Bio 324
12/01/12
Plastics in the ocean Imagine the massive breadth and spread of our great state of Texas. Now imagine every milli-inch of that piled high with trash: bottle caps, cigarettes, cigarette lighters, tampon applicators, plastic nets, discarded flip flops, Frisbees, soda bottles, milk jugs, diapers, six-pack rings, busted tennis rackets, empty pens, shampoo bottles, empty squeeze bottles of jam, you name it. Now take that image, double it, and plunk into the water. That's what is floating around the eastern corner of a 10-million-square-mile oval known as the North Pacific subtropical gyre. Nicknamed the "Eastern Garbage Patch," this buoyant stew of toxic pollution-most of which is plastic-is only one of five such garbage heaps caught in the swirling high-pressure currents characteristic of gyres. The others reside in the South Pacific, the North and South Atlantic, and the Indian Ocean. And each year, perhaps unwittingly, each one of us adds to plastic to the heap. Plastic makes it into our oceans in a variety of ways. About twenty percent of it comes from goods lost from boats: i.e. accidental loss of fishing tackle and other recreational gear, massive shipping containers carrying millions of plastic items washed overboard during severe storms; litter from pleasure boats, or illegal dumping of unwanted goods. Beachgoer’s debris is also a contributor. The other eighty percent is swept in from land. Just as Nonpoint Source Pollution from fertilizers, detergents, and pesticides find their way into our waters, so too are plastic items washing into our blue oceans. A discarded bottle cap or an empty sandwich bag thoughtlessly left along the side of the road will eventually be blown or kicked or washed into a storm drain, which will then shoot it straight into the ocean. Not all plastic floats. In fact, nearly half of it sinks to the bottom of