Commercial tour operators are limited in the numbers of people it can bring to Antarctica during any one season, so overpopulation by tourists doesn't appear to be a threat.
there wouldn't be any tourists in Antarctica
They feed on them and then the clams would overpopulate the beds if not eaten.
Animals will die
Nothing.
we will die in pane
Sea level will rise
If any animal was removed from the food web the animals that it would prey on would overpopulate and the animals that hunted it would starve because it has nothing to feed on.
'Going to Antarctica' is not an easy task, since there is no commercial transportation service to, or any hospitality service there or any casual facilities for tourists on the continent.
Visitors to Antarctica -- generally tourists -- arrive in boats and visit beaches. The most accessible are the beaches in the Antarctic Peninsula, but there are tours to other sea-side destinations.
It would generate a global catastrophe.
Antarctica is too cold and dry for agriculture or for growing anything. Within a few hours, the cactus would freeze.
Tourists Want To Go To Antarctica For The Exhilerating Feeling Of The Fact Your Standing, On The Bottom of the Earth, tourists also would like to go to Antarctica For The Delicate Scenery of the Ice landscape, and the amazing environment.