Species from around the world that are "hitching a lift" on ships threaten Antarcticas pristine marine ecosystem.
That is the conclusion of a study tracking research, fishing and tourist vessels that routinely visit the otherwise isolated region.
Any marine species that can cling to the hull of the ship and survive the journey to Antarctica could pose an invasive threat, including mussels, barnacles, crabs and algae.
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TV channel: BBC World News
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