The world for research, tourism and fishing. those ships, scientists say, bring potentially destructive species into this unique ecosystem. ships that visit antarctica don't just have, you know, one home port that they visit and go back and forth. these ships travel all around the world, so that was really surprising. and in terms of invasive species, that means that almost anywhere in the world could be a potential source for new species visiting antarctica. antarctica's wildlife has been isolated for millions of years. but marine species like mussels, barnacles and crabs clinging to ships' h...