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EXCLUSIVE: Is Alaska Safe For Sea Stars?

October 8, 2014

KCTS Congratulates Producer Katie Campbell, Winner of the Prestigious 2015 Kavli Science Journalism Gold Award

Campbell received the award for her story Is Alaska Safe for Sea Stars? “This piece was about far more than starfish,” said David Baron, quoted in the GeekWire article on Campbell's win. Baron is a former science editor for PRI’s “The World” and one of the judges for the competition. "By showing how biologists painstakingly collect data to understand the natural world, the story beautifully demonstrates what it means to be a scientist," continued Baron. Read full article on GeekWire>>

KCTS 9 EXCLUSIVE: A deadly disease has been wiping out West Coast starfish for more than a year. One place that has held off the disease the longest is Alaska. Researchers recently traveled there to search for new clues.

SITKA, AK -- It’s early morning in southeast Alaska. Stars have yet to fade from the night sky. A group of scientists sets out in search of a different kind of star.

Sea stars, commonly known as starfish, have been vanishing from North America’s Pacific shoreline.

Researchers inspect a Henricia spp. sea star for signs of wasting. About 20 different species of west coast starfish have been found to have symptoms of the disease.

“Almost everywhere we’ve looked in the last year, we’ve seen catastrophic losses of sea stars,” says Pete Raimondi, a biology professor at the University of California, Santa Cruz, who has been studying an alarming epidemic that’s been killing starfish by the millions.

Raimondi’s team has been tracking the spread of the disease. They noticed signs of the disease in Sitka in the summer of 2013, but there hasn’t been a mass die-off until now. Scientists believe that warming water or an infectious pathogen, like a bacteria or virus, may be to blame, but no one knows for certain.

Raimondi works alongside Melissa Miner, a University of California, Santa Cruz researcher. As waves crash onto the shores of Kayak Island near Sitka, they rope off a patch of shoreline and set to work counting and measuring the creatures that live here.

Raimondi and Miner’s survey is part of an effort to track the overall health of the Pacific coast’s rocky intertidal habitat. They’ve been conducting surveys at about 150 West Coast sites, many of them for more than 30 years. Their data has provided a critical point of comparison for what normal starfish populations have been in the past. Without similar surveys on the East Coast, it’s been difficult to measure the extent of the wasting there.

Pete Raimondi, professor at the University of California, Santa Cruz, searches for tiny sea stars that hide in the cracks and crevices of rocks on Pirate’s Cove in Alaska.

Crouching on the rocks, Raimondi aims his flashlight into the cracks and crevices. He’s hunting for a tiny six-armed star called a leptasterias.

“These cracks, in previous years, would be full of guys. They’re really empty this year,” Raimondi says.

Then he finds what he’s looking for --- a mottled gray star that even at full-size fits in the palm of his hand. It has whitish lines down it’s arms -- one of the early signs of wasting. The symptoms vary depending on the species of starfish, but Raimondi says it usually starts with lesions.

“They get white lesions, kind of sores. They become necrotic,” he says. “As the tissue dies, they often times will lose arms and then waste away. They disintegrate.”

Not far away, Miner finds a pisaster ochraceous, or ochre star, that looks even sicker. Two of its five purple arms look ghostly white, like they’ve been dipped in candle wax.

“This is probably the worst one that we’ve seen here today,” Miner says. “It’s diseased pretty heavily along this arm and it’s also spreading onto this arm.”

Sick sunflower star losing arms in Sitka Sound Science Center aquarium. Credit: Taylor White

Nearby at the Sitka Sound Science Center, aquarium manager Taylor White recently discovered that starfish in their touch tanks were losing limbs. The aquarium has an open-water system so what’s happening in the tanks is a good indicator of what’s happening in the surrounding marine waters.

“Every day I come in and I see more and more legs all over the tanks,” White says. “It’s upsetting to see them just flip of a switch start to crawl away from their bodies.”

White is concerned that the outbreak will wipe out many of Sitka’s starfish.

“We’ve been telling people to take their children out to low tide to see the starfish before they’re not there anymore,” White says.

Understanding Wasting Syndrome

Sea star wasting syndrome now affects almost every species of West Coast starfish. The plague has hit so hard over the past year that biologists fear some species could go extinct. After analyzing countless samples in the lab, some researchers believe that a virus or bacteria may be the root of the problem.

Sea star wasting syndrome now affects almost every species of West Coast starfish.

But the pattern of the spread of the syndrome has been perplexing. Diseased starfish were first noticed on Washington’s outer coast in June 2013. Over the winter, the disease killed off stars in droves near Vancouver, B.C. and some parts of Puget Sound. Then the syndrome seemed to skip down to California and later returned north to wipe out stars along the Oregon coast and the San Juan Islands.

“Right now we have no explanation that is consistent with the pattern that we’ve been seeing,” Raimondi says. (Watch timelapse video of the spread of the disease)

Drew Harvell surveys the intertidal zone of Eastsound on Orcas Island, looking for signs of sea star wasting syndrome.

Marine epidemiologist Drew Harvell has been studying the syndrome from the University of Washington’s Friday Harbor Labs on San Juan Island. She’s been coordinating nationwide research on the outbreaks and says the team has evidence that a pathogen is behind the die-offs.

“This is what we call a wide host range pathogen. It means that it affects many different species,” Harvell says. “Those are the most dangerous in wildlife disease in terms of a potential risk of extinction.”

Harvell says the team is testing the hypothesis that warm water could play a role in triggering the outbreaks. Starfish are stressed by higher temperatures, which make them more vulnerable to infection. Harvell’s team has been keeping an eye on the once abundant starfish populations in the San Juans. Cold water here may have helped them withstand the first wave of the disease. But summertime brought warmer waters to the islands and the stars suddenly got sick and the numbers of starfish at their research sites plummeted.

San Juan Ochre Star Surveys

As long as there are still pockets of healthy stars, Raimondi says recovery is possible.

In recent months temperatures throughout the Pacific have been unusually warm. In August global sea surface temperatures reached record levels -- the average temperature was 1.17 degrees Fahrenheit higher than the 20th century average.

As die-offs continue in Puget Sound and along the coast of Oregon, scientists have been looking north for a sign of hope.

“The hope is that the waters are cold enough in Alaska, the northern part of their range for many of these species, that they’ll persist there,” Harvell says.

Researchers found many healthy looking ochre stars in the tidepools near Sitka, AK, but after leaving Sitka they began receiving reports that starfish there were suddenly becoming sick. Credit: Greg Davis

Scientists hope that Sitka will mark the northern edge of the wasting syndrome. As long as there are still pockets of healthy stars, Raimondi says recovery is possible. That’s because starfish larvae can float in the water for up to 45 days, and ocean currents can carry the babies hundreds of miles from where they were born.

“That allows there to be replenishment downstream from populations upstream that are not affected,” Raimondi says. “That’s why it’s critical to go north to find whether there are still extant populations that are healthy.”

Starfish farther north in Juneau seem to be holding strong, Raimondi says. If that continues, parts of Alaska could still serve as a refuge from the disease.

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Katie Campbell

Katie Campbell was the senior managing editor for video at Cascade Public Media and a founding reporter of the public media reporting partnership EarthFix. She covered environmental issues of the Pacific Northwest for more than six years, earning numerous regional and national journalism awards including eight regional Emmy Awards for reporting, photography and editing, a 2017 Edward R. Murrow Award for Excellence in Innovation and the 2015 international Kavli Science Journalism Gold Award from the American Association for the Advancement of Science.

Katie currently works as a video journalist for the investigative journalism nonprofit organization ProPublica in New York City.

More stories by Katie Campbell

There are 2 comments

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Thank you for this article. Have been wondering about the causes and spread. I hope you continue to post updates, they are appreciated.

Thank you very much for the update. My family and I have traveled the entire west coast in the last two years. The lack of star fish in all these areas is astonishing. Hoping a cause will be found soon.