In August, Digital Journal reported on the die-offs, described by NOAA as an “unusual mortality event.” The deaths of the 11 fin whales,14 humpbacks, one grey whale, and four unidentified whales triggered investigations in the U.S. and in British Columbia.
Dr. Andrew Trites, director of the UBC Marine Mammal Research Unit, has been investigating the cetacean die-offs, and he suggests that the large mass of warm water in the Pacific Ocean off the coast of North America, known as “the blob,” may be responsible, according to the Huffington Post.
Trites explained that the 1,000 mile long, 1,000 mile wide, and 300 feet deep blob is hugging the coast of North America from Mexico to Alaska, a stretch of 2,000 miles or longer. The blob was first detected in 2013, and is expected to last through 2015.
Dr. Trites spoke with CTV News: “We can rule a few things out by having inspected their bodies to rule out things such as starvation, any signs of disease, any signs of having been hit by ships or caught by fishing gear,” Trites said. “We have to begin, in essence, doing ecological detective work.”
Trites says the blob has been blamed for causing toxic algae blooms. The Domoic acid, found in these toxic algae blooms is a neurotoxin and is likely passed on to krill, a common food source for both fin whales, humpbacks and other whales. When ingested in large amounts, the neurotoxin can cause brain damage or even death in birds and mammals.
“I think the most likely explanation for the deaths of these whales is that they were out at a big smorgasbord, a big party, and some of them got food poisoning,” Trites said. “They ate too much, and it caused their deaths.”
The Vancouver CTV News quotes Dr. Trites as saying the deaths of the whales should be a “wake-up call” to everyone that climate change is affecting not only those of us on land, but the creatures in the seas.
“The fact that three times more whales have died this year than we’ve seen in past years is a sign that something major has happened,” Trites said.
It’s important to remember that scientists at NOAA, Canada’s Department of Fisheries and Oceans (DFO), and Victoria’s Ocean Networks Canada (ONC) have not been able to confirm that a neurotoxin is responsible for the deaths of the cetaceans because none of the carcasses have been fresh enough to test for the toxins.
Scientists with the ONC support Trites’ hypothesis. “A whale’s at the top of the food chain, and so in fact they are an accumulator of toxins,” said Richard Dewey, ONC’s associate director for science. “We would expect the larger species to have the highest concentration of these toxins.”
In an email, the DFO told CTV News the theory given by Trites was so far, just speculation.