Peninsula marine life centers losing sea stars to mysterious disease
Keith Thorpe/Peninsula Daily News
Disa Wilson, a staff member of the Feiro Marine Life Center in Port Angeles, holds a leather star, one of only a few surviving sea stars at the facility.
Charlie Bermant/Peninsula Daily News
AmeriCorps volunteer Shannon Phillips lifts a diseased sea star out of the exhibit at the Port Townsend Marine Science Center to prepare it for euthanization by freezing.
Arwyn Rice/Peninsula Daily News
A team of volunteers from Feiro Marine Life Center in Port Angeles searches for sea stars in Freshwater Bay on Sunday in an effort to determine how many of the creatures suffer from sea star wasting disease.
By Arwyn Rice
Peninsula Daily News
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Survey: Sea star infection rates up at Freshwater BayPeninsula Daily News
PORT ANGELES — Sea star wasting disease infections among Freshwater Bay ochre stars jumped from 8 percent in June to 30 percent in July, according to a survey conducted Sunday.
During Feiro Marine Life Center's sea star survey, seven volunteers discovered few sea stars overall.
Among the ochre stars — one of the most common species of sea stars on the Clallam County coastline — many had only two or three arms remaining and were in the final stages of the disease, said Helle Andersen, a marine biologist at Western Washington University Huxley College of the Environment and a Feiro volunteer.
Seven of 23 ochre stars found at Freshwater Bay were infected with the disease.
“I've heard of places where there are 40 percent or more infected, but now we're at 30 percent,” Andersen said.
The June survey of the same location found 8 percent of ochre stars were infected.
Sunday's survey also found far fewer stars than have been seen at the site in the past, she said.
Previous surveys found as many as 214 ochre sea stars on the same rocky outcropping that Sunday's volunteers searched, but she cautioned that the numbers may not mean the sea stars have all died.
Those surveys have been conducted during lower tides that reveal more of the sea stars' habitat, and many live sea stars may still be clinging to the lower rocks.
Still, infection rates of those they did find have increased, Andersen said.
Volunteers also found other species of sea stars.
Only one sunflower star was discovered, and it was sick, Andersen said.
Among blood stars, 32 were found, and 4 were sick — for a 12.5 percent infection rate.
Andersen said the blood stars are small, and additional stars may have been hidden among the seaweed mat.
The Port Townsend Marine Science Center plans its next survey of an Indian Island beach in August.
Sea star wasting disease, which has decimated wild populations, also is tearing through captive collections.
The disease has accelerated this summer, said staff members at both the Feiro Marine Life Center in Port Angeles and the Port Townsend Marine Life Center.
It has eliminated at least one species of sea stars from the tanks at Feiro on City Pier, and has claimed 12 of the 15 ochre stars in a single tank at the Port Townsend Marine Life Center in Fort Worden State Park.
The centers, which pipe sea water into their tanks, are mirroring the devastation seen in the wild.
Sea stars are dying by the millions on the West Coast of the disease in which they seem to be sick and “deflated” and then “melt” into a white substance.
“It's the largest mortality event for marine diseases we've seen,” Drew Harvell, a marine epidemiologist at Cornell University, told EarthFix, a public radio media project.
“It affects over 20 species on our coast, and it's been causing catastrophic mortality,” she added in a report published this month by the Public Broadcasting Service.
Harvell, who has led nationwide efforts to understand the cause, saw more sickened sea stars this summer as the water around the San Juan Islands warmed.
She and others think the syndrome may be an infectious disease caused by a bacteria or virus.
If so, warming waters could make sea stars more vulnerable to the pathogen.
Caretakers at the Peninsula's marine science centers don't intend to replace sea stars until they feel more confident they can keep them alive — and avoid taking breeding adults that may be needed to replenish wild colonies.
Port Townsend center
The Port Townsend Marine Science Center lost most of its ochre sea stars in the last few weeks.
“Our ochre stars are really hard hit,” said Shannon Phillips, AmeriCorps marine exhibit educator.
The tank has been cordoned off with caution tape to keep visitors from touching it and possibly spreading the disease to a single healthy tank nearby.
It also draws public attention to the ongoing problem, she said.
A giant, 30-inch sunflower sea star that once occupied the large octopus tank at Feiro has succumbed to the disease, and all of the other sunflower stars also have died off, Facility Coordinator Bob Campbell said last week.
“I've seen it in all the species” of sea stars, in the center's tanks, he added.
Sea stars once were prominent in the center's tanks.
Now, fewer than 10 of the orange or purple ochre stars remain along with a small selection of blood stars and adult six-rayed stars.
At Feiro, an array of baby six-rayed stars smaller than the end of a pencil eraser provided a little bit of hope for the future of the sea creatures.
In the wild, the sunflower star — the largest sea star in the world, which can grow to an arm span of more than 3 feet — is both a predator and an efficient carrion eater that helps keep the ocean clear of the carcasses of dead animals, Campbell said.
The loss of those carrion eaters could result in ecological shifts, Campbell said.
Each sea star death in the tanks is recorded.
“You can't have too much data, but we haven't learned anything from it yet,” Campbell said.
Surveys by workers with both centers are surveying wild populations on the Peninsula.
In a June survey of Freshwater Bay west of Port Angeles, Feiro volunteers found that 8 percent of the sea stars were infected — a jump from the 2 to 4 percent found during monthly surveys since last fall.
The July survey, taken Sunday, found that the rate had leaped higher.
Signs of sea star wasting syndrome was found in 12 percent of blood stars and 30 percent of ochre stars.
A June survey of a beach on Indian Island near Port Townsend found a similar loss of sea stars, Phillips said.
But the center's staff members found an unusually large number of juvenile stars.
The primary predator of juvenile sea stars is adult sea stars, so they may be coming out of hiding because they feel safer, or they may simply be surviving at higher rates, Phillips said.
Researchers are studying if juvenile stars are more resistant to the disease than adults, Phillips said.
The current outbreak of sea star wasting disease, a sickness recorded on the Pacific Coast for more than 40 years, was first identified in June 2013 among sea stars on the Olympic National Park coastline.
By September, infected sea stars were spotted in isolated bays from British Columbia to Southern California.
The disease also was found in July 2013 among sea stars on the East Coast between Maine and New Jersey.
It was first seen in the Port Angeles area in December, when a sea star in the tanks in the Feiro building on City Pier was found to be infected and coastline surveys unearthed infections in the wild.
Other outbreaks were recorded in Maine in 1972 and in California in 1978, 1983 and 1997.
Outbreaks were associated with warmer than usual water temperatures, according to a study by Amanda Bates, Brett Hilton and Christopher Harley published in the Diseases of Aquatic Organisms in 2009.
Central information site
The National Park Service, Bureau of Ocean Energy Management, Partnership for Interdisciplinary Studies of Coastal Oceans, and the University of California, Santa Cruz, have established a central information website to track the disease, www.seastarwasting.org.
The site includes the most recent scientific discoveries and a map of sea star wasting syndrome survey locations, with the severity of infection rates in those locations.
Reporter Arwyn Rice can be reached at 360-452-2345, ext. 5070, or at firstname.lastname@example.org.
Last modified: July 27. 2014 6:55PM