Ice shelf collapse: What does it mean?

From krill to king crabs, the collapse of a 160-square-mile portion of the Wilkins Ice Shelf in Antarctica could mean many changes for wildlife at the bottom of the world.
http://rss.cnn.com/~r/rss/cnn_tech/~3/259873861/index.html (http://rss.cnn.com/~r/rss/cnn_tech/~3/259873861/index.html).