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Researchers announced on Tuesday that they had found two new species of cold-water coral in undersea canyons off New England, a discovery that highlighted concerns about the effects of global warming on the world’s oceans.

The corals were found about 150 miles southeast of Boston in the Northeast Canyons and Seamounts Marine National Monument, a vast area of undersea mountains and valleys that was designated a monument by President Barack Obama in 2016.

“There’s a lot of predictions right now that suggests this area of the Atlantic, the northwest Atlantic, is going to heat up three times faster than any other part of the Atlantic,” said Timothy Shank, a deep-sea biologist at the Woods Hole Oceanographic Institute who led the expedition.

Warming waters can kill coral, the same way extreme heat can kill humans. They can also reduce the level of nutrients in the water that corals need to survive.