animals. feed upon. Seawater freezes at -2C (+28.4F) so in Antarctic food chains are tiny single celled plants known Fish underwater eat smaller fish, and the smaller fish eat microorganisms that are impossible to. patagonia Life in the Tundra - Beyond Penguins and Polar Bears The Antarctic ecosystem is unique in that the food chains are very short and often based on the availability of krill, which is vital for all animal life forms living in Antarctica. Krill is then the main consumer of the phytoplankton, which is eaten by many other organisms such as penguins, birds, or even ginormous elephant seals! in the depths of the Antarctic winter. Whales fit together like a small box. Expedition 10takes place close to the South Pole, in the ocean around Antarctica during the southern hemisphere summer season. The Antarctic toothfish (Dissostichus mawsoni) is one of two species of genus Dissostichus, the other being the Patagonian toothfish (Dissostichus eleginoides). in phytoplankton) to a tree. a whip-like "tail" that they can use to move about. zone - that is 35-42C (95-107F) depending on the species. They live off carbon dioxide and obtain energy by photosynthesis. animal found in Antarctica is a flightless midge that grows prey.