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This is scientific American's 60 second science. I'm Christopher Intagata.

Antarctica is a lonely continent,

but the Antarctic Peninsula, the little tail that juts out toward

South America, is a hub of human activity.

More than 50 scientific research stations are based there, and in a recent travel season,

42,000 tourists visited, mostly from cruise ships.

Problem is, when humans go somewhere, hitchhikers come with, like a non-native flightless

midge, an insect that has already taken up residence in the

peninsula region.

And its biomass is greater than the biomass of all the other invertebrates in the soil.

It's already kind of taking over the nutrient cycling in that environment.

Kevin Hughes is an environmental researcher with the British Antarctic survey.

He and a team of experts recently reviewed a list of a hundred and three marine and

terrestrial species that might be poised to take up

residence on the continent. From that list, they pinpointed the 13 most likely to arrive,

establish themselves, and become invasive in the next decade.

At the top, mussels, which stick to ships and could carpet shorelines and smother native

species.

Antarctic shores and shallow waters could also fill with crabs, which haven't existed in those habitats

...