Is climate change killing American starfish?

December 6, 2015 by Magan Crane
Ochre sea stars (Pisaster ochraceus), also called starfish, are seen in the tidepools of Kalaloch Beach 3 in the Olympic Nationa
Ochre sea stars (Pisaster ochraceus), also called starfish, are seen in the tidepools of Kalaloch Beach 3 in the Olympic National Park, near Forks, Washington

On the remote rocky shores of the western United States, low tide brings visitors to wave-splashed tide pools to marvel at ocean wonders usually hidden from view.

But recently, largely missing from the bounty are the biggest draw: a rainbow-hued array of starfish.

"I don't know what you would call it other than catastrophic," says Drew Harvell, a biologist at Cornell University, describing what is widely regarded as one of the worst marine disease events ever recorded.

"It's staggering, really, the millions of stars that have died. It is not apocalyptic or extreme to say that."

In recent years, millions of the starfish, also called , have had their legs curl up and pull away from their bodies, breaking the animals to pieces before they turn to mush, often in a matter of days.

Scientists have been left racing to figure out why.

Once densely packed onto the rocks and on the ocean floor, the key predators are simply missing from some locations, their numbers cut by 95 percent or more.

The phenomenon, called Sea Star Wasting Syndrome, was first noticed by rangers in Olympic National Park in Washington state in 2013.

It has now been documented from California to Alaska, and led to die-off that is bigger and more widely spread than any seen before.

Late last year, a group of researchers published findings in the Proceedings of the National Academy of Sciences saying they had found strong evidence that a virus was causing the disease.

Researchers now are looking into why the virus is suddenly so much more widespread and deadly. A primary consideration is how warmer water, brought about by climate change, is affecting the stars, the virus and the wider ecosystem.

An ochre sea star (Pisaster ochraceus), commonly called a starfish, sick with Sea Star Wasting syndrome is the tidepools of Kala
An ochre sea star (Pisaster ochraceus), commonly called a starfish, sick with Sea Star Wasting syndrome is the tidepools of Kalaloch Beach 3 in the Olympic National Park, near Forks, Washington

"There are components that certainly track with temperature," Harvell said. "We think the magnitude in our waters is due to temperature. We know that under warmer conditions, they die faster."

"We've had anomalously warm oceans for the last two years. Really, what we would call hot water. It is really the dominant thing to consider," she said.

Data collection difficult

A primary challenge for researchers is simply the massive amount of data needed to get a good understanding of what is happening. The animals are found on thousands and thousands of miles of coastline, and sufficient funding is simply not available to thoroughly count them and consider all the possible variables.

But scientists are nevertheless trying.

They are tracking the numbers of stars in locations over time, gauging the temperature and chemistry of the water, and logging the data as part of ongoing research into the ecosystem. They are even recruiting "citizen scientists" to help search for the stars and record their condition.

Melissa Miner, a researcher with the University of California at Santa Cruz, is one of the people leading the , but said the widespread nature of the outbreak adds to the challenge.

"It is pretty difficult to collect the data we need on a big scale," she said. "I really want to stress that it isn't understood at all what it is causing this disease."

Harvell agreed that money for the extensive research is scarce. It doesn't help that the starfish are not an animal humans eat, and thus there is no industry raising the alarm about their decline.

An Ochre sea star (Pisaster ochraceus), also called starfish, is seen in the tidepools of Kalaloch Beach 3 in the Olympic Nation
An Ochre sea star (Pisaster ochraceus), also called starfish, is seen in the tidepools of Kalaloch Beach 3 in the Olympic National Park, near Forks, Washington

"Out of sight, out of mind," she said. "We need to be concerned about the health of our oceans. We could be so much farther ahead if there had been enough money available."

Congressman Denny Heck, whose district in Washington state includes much of the inland waters where starfish have been dying off in huge numbers, is trying to help by establishing a framework for declaring a marine disease emergency. Such a declaration would come with money for research and possible recovery.

"When disease like this breaks out underwater, we have no established process to stop it," Heck told AFP.

He has found allies on both coasts, as well as among his fellow Democrats and Republicans, as a disease outbreak could hit fisheries and devastate a local economy, but is not optimistic about the chances of his bill in the Republican-led Congress.

An ochre sea star, (Pisaster ochraceus), also called starfish, is seen at low tide on the beach in Bremerton, Washington
An ochre sea star, (Pisaster ochraceus), also called starfish, is seen at low tide on the beach in Bremerton, Washington

"When I'm home in Washington state, the effects of are all too real. Our salmon are dying due to higher water temperatures, the snowpack at Mount Rainier is disappearing, our waters are becoming more polluted, and the increasingly dry, hot summers are causing massive forest fires," Heck said.

But he says when once back in the US capital, "the same concerns seem to be absent among the (Republican)-controlled Congress, even though I know the communities they represent also have evidence of a serious problem. The urgency from the majority party to deal with these problems just isn't there."

Ochre sea stars (Pisaster ochraceus) sick with Sea Star Wasting syndrome are seen alongside healthy stars in the tidepools of Ka
Ochre sea stars (Pisaster ochraceus) sick with Sea Star Wasting syndrome are seen alongside healthy stars in the tidepools of Kalaloch Beach 3 in the Olympic National Park, near Forks, Washington

For her part, Miner is hopeful that the colorful sea stars have a high enough profile to draw attention to their demise.

"They are as charismatic as you can be as an intertidal species," she said. "They are what connects people to ocean. The sea star is kind of the mascot of the intertidal."

Explore further: Is climate change killing American starfish?

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5 comments

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gkam
3 / 5 (4) Dec 06, 2015
Why are we so quick to kill but so hesitant to do the right thing? How did we go so far astray?
Estevan57
3.4 / 5 (5) Dec 06, 2015
A virus is "quick to kill"? Next time read the whole article.
gkam
2.3 / 5 (6) Dec 06, 2015
Next time think about the bigger picture, to which I refer. Do we always have to be perfectly direct and stringently literal for some folk?
Estevan57
4.2 / 5 (5) Dec 06, 2015
Actually, you refer to nothing.

If you want to say something about climate change and its results, then do so.
If you want to say you are quick to kill, go ahead, but who else are you including as "we"?
If you hesitate to do the right thing, work on that, George.

Uncle Ira
3.3 / 5 (7) Dec 06, 2015
Do we always have to be perfectly direct and stringently literal for some folk?


Non Cher. But all you can say with a bumper sticker slogan is your emotional state and not much else. That's why I say your postums on here read like somebody smoking the marijuana what is making him think he is really smart.

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