Ocean Conditions Contributed to Unprecedented 2015 Toxic Algal Bloom

toxic algal bloom
A high-resolution image of Pseudo-nitzschia australis, which dominated the 2015 toxic algae bloom. (Photo by C. Wingert/SFSU)

A new study connects the unprecedented West Coast toxic algae bloom of 2015 that closed fisheries from southern California to northern British Columbia to the unusually warm ocean conditions — nicknamed “the blob” — in winter and spring of that year.

toxic algal bloom
This map shows impacts of the 2015 West Coast toxic algal bloom (see larger image here). Orange symbols represent mammals detected with domoic acid, while those colored red also showed symptoms of poisoning. The numbers indicate how many mammals were affected. Shaded and hatched regions show closures for anchovy fisheries, offshore Dungeness and rock crab fishing, and shellfish harvesting. (Credit: NOAA’s Northwest Fisheries Science Center)

UC Santa Cruz ocean scientist Raphael Kudela contributed to the study, which was accepted for publication in Geophysical Research Letters and isavailable online.

“We have toxic algae events that result in shellfish closures off the Washington and Oregon coast every three to five years or so, but none of them have been as large as this one,” said lead author Ryan McCabe, a research scientist at the University of Washington’s Joint Institute for the Study of the Atmosphere and Ocean in Seattle. “This one was entirely different, and our results show that it was connected to the unusual ocean conditions.”

“This paper is significant because it identifies a link between ocean conditions and the magnitude of the toxic bloom in 2015 that resulted in the highest levels of domoic acid contamination in the food web ever recorded for many species,” said coauthor Kathi Lefebvre, a marine biologist at NOAA‘s Northwest Fisheries Science Center in Seattle. “This is an eye-opener for what the future may hold as ocean conditions continue to warm globally.”

The authors found the 2015 harmful algal bloom, which set records for its spatial extent and the level of toxicity, was dominated by a single species of diatom,Pseudo-nitzschia australis, normally found farther south off California.

“This species is almost always highly toxic,” said Kudela, the Lynn Professor of Ocean Health at UC Santa Cruz. “It blooms every spring off California, and there are frequently marine mammal impacts. But to see P. australis up and down the coast like this was unprecedented.”

Favorable environment

Warm water not only allowed this species to survive, it also created an environment favoring its growth. By early 2015 the warm “blob” had moved toward shore and spread all along the West Coast. Warmer water creates less dense surface water that is more likely to stay floating on the surface, where it can become depleted in nutrients.

Previous laboratory studies by coauthor William Cochlan of San Francisco State University showed P. australiscan take up nitrogen very quickly from a variety of sources, and appear to outcompete other, nontoxic phytoplankton in nutrient-depleted warm water.

For the new study, Cochlan’s lab performed experiments with P. australis from the 2015 bloom. They showed when these cells experience warmer temperatures and get more nutrients they can double or triple their cell division rates, allowing them to potentially bloom into a large population fairly quickly at sea.

“When springtime shifts in wind direction brought deeper, nutrient-rich water upward near the coast, a small population of P. australis became a big population, which was then washed ashore along the West Coast by late spring storms,” said coauthor Barbara Hickey, a professor of oceanography at the University of Washington.

Domoic acid

Toxic algae come in many forms, but off the West Coast the major health and economic threat comes from various Pseudo-nitzschia species which can, under certain conditions, produce domoic acid, which can cause gastrointestinal distress, seizures, memory loss and even death.

Toxins can accumulate in razor clams and mussels, making them unsafe for human consumption. But the effects in the ecosystem are more widespread and long-lasting. Shellfish and anchovies containing toxins can get eaten by marine mammals and birds. If toxic algae settle to the ocean floor, they also can get eaten by bottom-dwelling animals like crabs, which then become unsafe to eat.

In late May 2015, a sea lion was found convulsing on a Washington beach, and domoic acid was identified in its feces.

“That’s something we’d never seen before in Washington, and when we heard this news we knew something huge was going on,” said coauthor Vera Trainer, a research oceanographer at NOAA‘s Northwest Fisheries Science Center.

NOAA cruise

That year saw the largest geographic extent of marine mammal impacts ever recorded. A NOAA-led cruise in June 2015 sampled water from southern California up to Vancouver Island, British Columbia. The new study includes those observations, collected near the end of the Washington bloom, as well as other ongoing beach monitoring and water sampling efforts that filter seawater to see the life it contains.

Researchers at the Northwest Fisheries Science Center examined the water samples under a high-resolution scanning electron microscope to identify the species present.

“As we started getting more and more of the samples that coincided with the peaks in the razor clam toxicity, it was quite clear that P. australis was the dominant species all along the coast,” Trainer said.

State resource managers have been collecting shellfish to monitor for toxins for decades. Kudela’s lab conducts regular monitoring in Monterey Bay. Farther north, samples collected by the Olympic Region Harmful Algal Blooms Partnership and other efforts have also contributed to a 25-year record of toxic algae events.

The new paper compares the history of toxins in razor clams to indices of ocean climate variability, and finds a connection with El Niño and the longer-term Pacific Decadal Oscillation.

“There’s a significant connection there,” McCabe said. “The toxic events also tend to coincide with previously established marine ecosystem shifts. We had not made that connection before, and I think it’s fascinating.”

Ocean climate cycles could help understand and better predict the emergence of toxic algal blooms. And while the blob was a one-time event that was not due to global warming, it provides a window into what climate change might look like.

“Species like Pseudo-nitzchia are extremely well-poised to take advantage of background warming,” McCabe said. “Pseudo-nitzchia are always out there along our coast. The fact that they are almost engineered to take advantage of situations like this — warm temperatures and low nutrients — that is concerning.”

He recommends more monitoring of harmful algal blooms, through collecting shellfish and water samples on the coast and offshore to see whether toxins or toxin-producing algae are present, and if so, which species.

“Without stably funded programs like that, we’re just going to be blind,” McCabe said.