Extremely cold temperatures, little sunlight and moisture, poor soil quality, and a short growing period have deterred most species of flora from successfully growing in this barren ecosystem. Whales. | King penguin. The changes in the oceanic environment and the Antarctic Peninsula's warming have caused krill and, consequently, the Adlie Penguin populations to drop by 70 to 90% since 1982. They feed on small fish and krill, and are eaten by whales, seals and sea birds. Angiosperm Phylogeny Website. What eats hairgrass in antarctica? //