On the Arctic sea floor lie hungry predators that can eat polar bears. The voracious carnivores are starfish, and a new study by a national research group says they tie with polar bears as the top predators of the Arctic marine ecosystem.
Co-author Remi Amiraux, a post-doctoral fellow at the University of Manitoba, said sea floor, or benthic, organisms are not commonly studied because they are often assumed to be lower on the food chain.
Seastars within the Pterasteridae family sat at the top, with the study dubbing them “the benthic equivalent to polar bears.” He said that invertebrates, or creatures without backbones, living in sediment on the Arctic sea floor did not just consist of plant-eating herbivores. The study’s authors say “megafaunal-predatory” Pterasteridae seastars thrive in this realm “because of their evolved defence mechanism associated with a diet of other predators, including marine mammal carcasses that settle onto the ocean floor.”“Actually, when a polar bear dies, it can be eaten by carnivore seastars,” Amiraux said.
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