Deep-sea Arctic sponges feed on fossilized organisms to survive

In the cold, dark depths of the Arctic Ocean, a feast of the dead is under way.

A vast community of sponges, the densest group of these animals found in the Arctic, is consuming the remains of an ancient ecosystem to survive, researchers report February 8 in Nature Communications.

The study highlights just how opportunistic sponges are, says Jasper de Goeij, a deep-sea ecologist at the University of Amsterdam not involved with this work. Evolutionarily speaking, sponges “are more than 600 million years old, and they inhabit all parts of our globe,” he says. Scientists might…