Drake Passage doesn't pose the same ecological risk, of course because the ecosystems are acclimatized to such a passage being there, but also because it's in t

Drake Passage doesn't pose the same ecological risk, of course because the ecosystems are acclimatized to such a passage being there, but also because it's in the southern ocean surrounded by strong currents and cold water that mostly does not mix with the Atlantic and Pacific oceans. So many of the species at higher latitudes are essentially trapped on their respective side.