Mass die-off of whales in Atlantic investigated
Humpback whales have been dying in extraordinary numbers along the Eastern Seaboard since the beginning of last year. Marine biologists have a term for it — an “unusual mortality event” — but they have no firm idea why it is happening.
Forty-one whales have died in the past 15 months along the Atlantic coast from North Carolina to Maine. In a news conference on Thursday, officials from the National Oceanic and Atmospheric Administration Fisheries said that they had not identified the underlying reason for the mass death, but that 10 of the whales are known to have been killed by collisions with ships.
The agency is starting a broad inquiry into the deaths.
Strandings ‘alarming’
These whales “have evidence of blunt force trauma, or large propeller cuts,” said Deborah Fauquier, a veterinary medical officer at the agency’s Office of Protected Resources. These collisions with ships were “acute events,” Fauquier said, and were being treated as the “proximate cause of death.”
Fauquier said that the number of whale strandings was “alarming,” and that she hoped the investigation might give a sense of what kind of threat this presents to this population of humpback whales and those around the world.
On average, eight humpback whales are stranded each year from Maine to Virginia, and fewer than two are hit by ships, according to data from NOAA.
An unusual mortality event is a specific designation under the Marine Mammal Protection Act, and is defined as “a stranding that is unexpected, involves a significant die-off of any marine mammal population, and demands immediate response.”
Whale or other marine mammal die-offs are often poorly understood by scientists, and this case is no exception. Officials from NOAA Fisheries could not explain why the animals were coming into greater contact with vessels, or if there were any humancaused or climate-related disturbances that had changed their behavior.
Gregory Silber, marine resources manager in the agency’s Office of Protected Resources, said that there had not been any increase in ship traffic in the region, and that the whales might be following their prey — they mostly eat krill and small fish — to areas where there could be more shipping.
Ten whales other than those killed by ships have been examined, but officials have not yet determined the cause of death. There is no indication that they were killed by disease.
Humpback whales, which can be as long as 60 feet, weigh as much as 40 tons and can live for 50 years, are found in all of the world’s oceans. There are 14 distinct population segments of humpback whales, some of which are classified as endangered or threatened. The population along the Atlantic coast, which winters in the Caribbean and summers in the North Atlantic or Arctic regions, is not now considered threatened under the Endangered Species Act.
Marine noise cited
Around the world, there are an estimated 30,000 to 40,000 humpback whales — about a third of its original population. The Atlantic population is around 10,000.
Scientists have suggested that some whale deaths could be a result of marine noise, often a result of military activity, offshore drilling or exploration, which can disorient the animals and send them in the wrong direction, possibly toward beaches where they get stuck instead of into the deeper ocean.
Silber, the NOAA manager, said he was not aware of a connection between ocean noise and these strandings.