Before revision: It seems that polymetallic nodules in the region, the target of much deep-sea mining, are crucial for fostering a high level of biodiversity on the sea floor .
After revision: ; they exist at overlapping depths with the species thought to be dependent on them, and in their absence, biomass decreasesIt seems that polymetallic nodules in the region, the target of much deep-sea mining, are crucial for fostering a high level of biodiversity on the sea floor .