June 15, 2022 — North Atlantic right whales are some of the most endangered marine mammals on the planet. Threatened by shipping collisions and tangles with fishing nets, fewer than 400 individuals are thought to exist in the wild today.
Now, scientists are adding climate change to its list of dangers.
Recent studies suggest that warming ocean waters are shifting the tiny crustaceans that right whales like to eat, causing them to multiply at different times of the year and move into new parts of the ocean. As the whales follow their prey, they’re abandoning some of their old feeding grounds, migrating into some new ones and arriving in some places earlier or later than they would usually be expected.
As a result, scientists warn, they’re showing up in spots that don’t necessarily have adequate protections in place for them. That may increase their risk of running into ships or nets.
A new study, out last week in the journal Global Change Biology, is the latest to raise the alarm.
The research finds that right whales are changing the way they move through Cape Cod Bay, one of their preferred spring foraging grounds. They’re using the habitat more heavily than they did in the past and their peak numbers are shifting later in the season.