Mussels affected by climate change
Miguel Llanos

Mussels don't stick around in acidic ocean water

Ocean acidification impairs mussels' ability to attach to surfaces – alarming commercial growers farming the waters around Puget Sound. If you like your moules marinieres, this is bad news.

PENN COVE, Wash. – Cookie tray in hand and lifejacket around chest, Laura Newcomb looks more like a confused baker than a marine biologist. But the University of Washington researcher is dressed for work.

Her job: Testing how mussels in this idyllic bay, home to the nation's largest harvester of mussels, are affected by changing ocean conditions, especially warmer and more acidic waters. It's a question critical to the future of mussel farmers in the region. More important, it's key to understanding whether climate change threatens mussels around the world, as well as to the food chains mussels support and protect in the wild.

"Along the West Coast, mussels are well-known ecosystem engineers," said Bruce Menge, an Oregon State University researcher who studies how climate impacts coastal ecosystems. "They provide habitat for dozens of species, they provide food for many predators and occupy a large amount of space, so are truly a 'dominant' species."

Breaking with 20 million years of tradition

Miguel Llanos

Carbon from greenhouse gas emissions has steadily turned seawater more acidic, disrupting organisms accustomed to slightly alkaline waters of the past 20 million years.

In the case of mussels, an earlier University of Washington lab study found that increased carbon dioxide weakens the sticky fibers, called byssus, that mussels use to survive by clinging to objects like shorelines or the ropes used by commercial harvesters.

"If byssal thread weakening does eventually become important," Menge added, "the consequences would be major if not catastrophic."

Newcomb's goal now is to apply in the real world what was learned in the lab. "Instead of spending a lot of time tightly controlling the temperature and pH conditions mussels grow in, I use the natural seasonal variation to try to answer the same questions," Newcomb said.

Newcomb's field office is the rear deck of a harvesting boat -- right between the toilet and the microwave. The quarters are cramped, but the view is grand: The blue waters of Penn Cove on Washington state's Whidbey Island are set against rolling bluffs and snow-capped mountains.

The University of Washington marine biologist is there courtesy of Penn Cove Shellfish, which is also the oldest and best known mussel operation in the United States. If you're a mussel fan, you've probably had a few – they're sold at Costco as well as upscale restaurants across the country.

Placing just-harvested mussels on her tray, Newcomb samples for size, thickness and strength. The mussels are grown on 21-foot-long ropes hanging from several dozen rafts in the bay, and Newcomb takes samples from two depths: Three feet and 21 feet. She also samples water temperature and pH levels at those depths.

Trouble in acidic waters

Miguel Llanos

Prior to the Industrial Revolution and the explosion of manmade CO2, ocean pH averaged 8.2. Today it's 8.1, a 30 percent increase in acidity on the logarithmic scale. Computer models peg ocean acidity at 7.8 to 7.7 by the end of the century at the current rate of greenhouse gas emissions.

Washington state is a bit ahead of that curve because ancient carbon stores in the deep ocean are periodically churned up by local currents.

The surprising lab discovery was that mussel byssus weakened by 40 percent when exposed to a pH of 7.5.

At Penn Cove, low pH levels are not uncommon – Newcomb has even seen 7.4 in the year that she's been sampling.

"We're worried they're going to see it more frequently," said Emily Carrington, Newcomb's graduate adviser and leader of the University of Washington team that published the earlier lab results.

The Penn Cove work follows well-publicized research that show oyster larvae in hatcheries along Washington's coast are having trouble forming shells because of the acidic waters.

"Mussels are the new oysters," Carrington said. But there's a twist: Mussels confirm that ocean acidification's impact extends in mollusks beyond an inability to form a shell.

The lab finding is "part of a growing body of evidence that ocean acidification alone and combined with other stressors will have effects beyond shell mineralization," said Terrie Klinger, a University of Washington marine sciences professor studying the impacts of acidification.

Other research, she said, shows more acidic seas spurs "changes in fish behavior and toxin production in harmful algae."

Miguel Llanos

Penn Cove Shellfish and the UW researchers joined forces after company harvesters saw empty patches on some cultivation ropes that should have had mussels. Was that due to weakened byssus?

"We had a significant amount two years ago, and little bit less last year," said Ian Jefferds, general manager at Penn Cove Shellfish. "The question arose, 'Was there something related to that?'"

The concern about what the industry calls "slough-off" goes well beyond Penn Cove.

"We know that mussel slough-off has periodically been an issue but we don't know why," said Margaret Barrette, director of the Pacific Coast Shellfish Growers Association.

It's a global issue. Among major shellfish producers, New Zealand is creating an acidification monitoring network while researchers in Spain are planning a study similar to that in Penn Cove.

And across the Mediterranean, mussel farmers have reported problems. "A great majority of producers experienced important difficulties in past years as a consequence of summer heat waves," said Luis Rodrigues, a researcher with a European Commission panel studying acidification.

Those issues include slough-off in Italy and Montenegro, as well as thinning of shells and even die-offs in waters that topped 82.4 degrees F.

A related lab study showed "total mortality" of mussels when exposed to waters above 82.4 degrees, said researcher Frederic Gazeau.

That team also "observed a very clear impact of acidification on the capacity of mussels to produce their byssal thread," noted Gazeau. "At low pH, it was very easy to pick up mussels individually; they could not attach themselves anymore."

Miguel Llanos

Of course, it's not just loss on the farms that worry scientists. In the wild, mussels form vast beds along coastlines, and some areas have seen slough-off as well.

"It's quite common in California in recent years," said Herb Waite, a University of California, Santa Barbara, biochemist who studies mussels. "A favorite collecting spot will suddenly disappear."

Any widespread slough-off in the wild could have other repercussions as well. It hasn't happened yet, but researchers are worried.

Mussel beds in sandy areas "stabilize shores against erosion," Waite noted, and any loss there could expose beaches to the erosive power of waves.

Carrington thinks her team's research could lead to an "early warning system" for a global mussel farming sector valued at $1.5 billion a year. Establishing pH thresholds, farmers could better monitor areas and, if needed, seek out safe havens in less acidic and cooler waters.

"It does matter where in the water mussels are," Newcomb added, noting that even preliminary results suggest growing them closer to the surface tends to mean less acidity. However, a trade-off there can be warmer temperatures.

The research will need two more years of data gathering before any definitive conclusions, but Carrington said the earlier lab tests underscore the need for field data.

"Would you be worried about being weakened by 40 percent?" she asked. "I would be."


Miguel Llanos is a freelance reporter based in the Pacific Northwest.

Jellyfish floating in the ocean
Credit: Pexels/Pixabay

Scientists call on UN to adopt bold ocean policies to combat climate and biodiversity threats

In the lead-up to the United Nations Ocean Conference that opens today in France, scientists released ten policy recommendations urging world leaders to act swiftly on climate change, overfishing, and marine pollution based on existing scientific evidence.

Teresa Tomassoni reports for Inside Climate News.

Keep reading...Show less
Green coral on a reef.

EU ocean protection plan draws fire for weak enforcement and lack of binding goals

Days before the United Nations Oceans Conference, the European Union unveiled a marine protection plan that environmental groups say fails to deliver meaningful safeguards for Europe’s seas.

Rosie Frost reports for Euronews.

Keep reading...Show less
Wildfire smoke in the distance with a forested hill in the foreground.

Wildfire smoke from Canada continues to choke U.S. cities as climate patterns worsen

A blanket of smoke from Canadian wildfires drifted into the U.S. Midwest last week, signaling another season of toxic air driven by rising global temperatures.

Scott Neuman reports for NPR.

Keep reading...Show less
factory during daytime with smoke billowing above farm crops.

EPA rollback plan threatens billions in savings and thousands of lives, analysis shows

The Trump administration’s proposed reversal of major U.S. Environmental Protection Agency pollution rules could lead to tens of thousands of premature deaths and erase hundreds of billions in annual health and climate benefits, according to an Associated Press analysis.

Seth Borenstein, M.K. Wildeman, Melina Walling, Joshua A. Bickel and Matthew Daly report for The Associated Press.

Keep reading...Show less
electric vehicle EV charging at a charging station.

New Trump administration rule weakens efforts to promote cleaner cars

The Trump administration just threw a wrench into Biden’s fuel efficiency plans, publishing a new rule that challenges how electric vehicles factor into federal standards.

Rachel Frazin reports for The Hill.

In short:

  • The U.S. Transportation Department issued a rule saying the Biden administration improperly used electric vehicles to calculate carmakers’ fuel economy standards.
  • While not eliminating Biden’s rules outright, the administration suggested it may not enforce them during its own rulemaking process, arguing the current standards are akin to an EV mandate.
  • The move undercuts one of Biden’s core climate strategies and could reduce pressure on automakers to improve efficiency — unless U.S. Environmental Protection Agency rules, which Republicans are also trying to reverse, stay intact.

Why this matters:

Fuel efficiency rules are one of the federal government’s main tools to cut transportation emissions — the top source of greenhouse gases in the U.S. While this new rule doesn’t outright kill the fuel economy standards, it signals the administration likely won’t enforce them while it writes its own version.

Read more: The role of electric vehicles in the push for environmental justice

Electric vehicle being charged.

Move to revoke California EV rules threatens state authority on clean air

Electric vehicle mandates in California and 11 other states face rollback after a Senate vote backed by President Trump, raising legal questions and potentially slowing the nation’s transition away from fossil fuels.

Francine Kiefer reports for The Christian Science Monitor.

Keep reading...Show less
white wind turbines on golden field under blue and white sunny cloudy sky during daytime.

Repealing clean energy incentives could cost families hundreds more in utility bills

A Republican-backed bill aiming to roll back the Inflation Reduction Act’s clean energy support would increase average household energy costs by $250 to $415 annually, according to multiple policy analyses.

Naveena Sadasivam reports for Grist.

Keep reading...Show less
From our Newsroom
Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

One facility has emitted cancer-causing chemicals into waterways at levels up to 520% higher than legal limits.

Regulators are underestimating health impacts from air pollution: Study

Regulators are underestimating health impacts from air pollution: Study

"The reality is, we are not exposed to one chemical at a time.”

Pennsylvania governor Josh Shapiro speaks with the state flag and American flag behind him.

Two years into his term, has Gov. Shapiro kept his promises to regulate Pennsylvania’s fracking industry?

A new report assesses the administration’s progress and makes new recommendations

silhouette of people holding hands by a lake at sunset

An open letter from EPA staff to the American public

“We cannot stand by and allow this to happen. We need to hold this administration accountable.”

wildfire retardants being sprayed by plane

New evidence links heavy metal pollution with wildfire retardants

“The chemical black box” that blankets wildfire-impacted areas is increasingly under scrutiny.

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.