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Innovative Lab Gauges Acidification Effects on Marine Snails

NOAA Ocean Acidification Program

Innovative lab gauges acidification effects on marine snails

Michael Maher working at the NOAA Northwest Fisheries Science Center Mukilteo field station with Mobile Ocean Acidification Treatment Systems (MOATS). Credit: NOAA NWFSC  

Carbon dioxide scrubbers like those that clean the air in space stations. Precision monitors and instruments. Industrial parts used in wastewater treatment. Michael Maher’s job was to assemble the pieces into one of the most sophisticated ocean acidification simulation systems yet developed. Ocean acidification is the decrease in ocean pH due to its absorption of carbon dioxide from the atmosphere – carbon dioxide forms an acid when it dissolves in water. “You have tools available – they may not be designed for this purpose but you can try to make them all work together,” said Maher, a research biologist at NOAA Fisheries’ Northwest Fisheries Science Center in Seattle. “There wasn’t a blueprint or a kit you could order because nobody had really been trying to do this kind of thing before.” The system that Maher and the ocean acidification research team built in the Science Center’s parking lot has provided new insight into the impacts of future ocean conditions on marine species. Researchers used it to examine what happens to small marine snails from Puget Sound when exposed to both current ocean conditions and the acidified conditions expected in the future. The research is described in a new paper in the online journal PLOS ONE reporting that current West Coast ocean waters are acidified enough to dissolve the shells of the snails, called pteropods. The finding is not a surprise: Another NOAA-led team reported in April that shells of pteropods in near-shore habitat on the West Coast show signs of dissolution due to acidified waters. What is important about the new research is that it measured the extent of shell damage at escalating carbon dioxide concentrations, each translating to a different degree of acidification, in a controlled laboratory environment said Shallin Busch, a NOAA research ecologist. The findings are a first step toward using the pteropod species examined in the study as a living barometer or indicator of ocean acidification along the West Coast. “Our findings are a piece of the puzzle,” said Busch, the lead author of the new paper. “Now we know, yes, pteropods from the North Pacific are sensitive to ocean acidification. Now that we have confirmed their sensitivity, we need to look more closely at how pteropods are responding to current ocean conditions and what may happen in the future as carbon dioxide increases.”

NOAA Hollings Scholar, Patricia Thibodeau collects seawater from Puget Sound for chemistry measurement. Credit: NOAA NWFSC  

Pteropods provide important nutrition for whales, seabirds and fish such as herring, salmon and mackerel, so changes in their populations could rattle through the marine food chain. Carbon emissions during the industrial era have lowered the average global ocean pH from 8.2 to 8.1, turning oceans slightly more acidic. West Coast waters are naturally acidified compared to other parts of the ocean so they may affect marine life such as pteropods sooner than acidifying waters elsewhere in the world. The research also demonstrated the capacity of the NWFSC’s ocean acidification system to hold marine life at different carbon dioxide concentrations for extended periods. The system can control temperatures, oxygen levels and light for even more precise management of conditions during experiments. “They are all dependent on each other – if you change the temperature, the pH will change,” Maher said. The system that carefully manages all the variables is “ a combination of machines and precisions instruments.” The comprehensive controls allow researchers to isolate acidification as the cause of the shell damage, ruling out other factors that might otherwise be at play in a natural environment. “There are not a lot of cases where we can definitively say, ‘This change is the result of acidification,’” said research ecologist Paul McElhany, Busch’s colleague at NWFSC. “It’s very hard to disentangle unless you know that’s the only thing changing. Experiments like this provide evidence about the effects of acidification alone.” Busch said each member of the research team – Maher, McElhany and NOAA Hollings Scholar Patricia Thibodeau – brought individual skills to the research. The team has also developed a smaller and transportable version called a Mobile Ocean Acidification Treatment System, or MOATS that could be carried in the field or aboard research ships. Thibodeau joined the research team for the summer of 2012 after her junior year at Bowdoin College in Maine. One of her initial tasks was to collect pteropods from Puget Sound by boat at night to stock the experimental system. Pteropods ascend in the water column at night to feed. The vertical movement naturally exposes them to varying carbon dioxide concentrations, which the ocean acidification system can simulate. Later Thibodeau helped examine the shells of pteropods exposed to different concentrations of carbon dioxide. As with most science experiments where objectivity is paramount, she did not know which ones had been exposed to which concentrations when she rated the extent of damage to each shell. “Sometimes biology can be so unpredictable, but this had such a clear outcome and relationship, it was very interesting to be a part of,” said Thibodeau, who just began work on her PhD at the Virginia Institute of Marine Science. “There is definitely a human component to the issue because so many of us eat oysters and clams and other species affected by ocean acidification. So what we know and what we do really makes a difference.”



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The NOAA Ocean Acidification Program (OAP) works to prepare society to adapt to the consequences of ocean acidification and conserve marine ecosystems as acidification occurs. Learn more about the human connections and adaptation strategies from these efforts.

Adaptation approaches fostered by the OAP include:


Using models and research to understand the sensitivity of organisms and ecosystems to ocean acidification to make predictions about the future, allowing communities and industries to prepare


Using these models and predictions as tools to facilitate management strategies that will protect marine resources and communities from future changes


Developing innovative tools to help monitor ocean acidification and mitigate changing ocean chemistry locally


On the Road

Drive fuel-efficient vehicles or choose public transportation. Choose your bike or walk! Don't sit idle for more than 30 seconds. Keep your tires properly inflated.

With your Food Choices

Eat local- this helps cut down on production and transport! Reduce your meat and dairy. Compost to avoid food waste ending up in the landfill

With your Food Choices

Make energy-efficient choices for your appliances and lighting. Heat and cool efficiently! Change your air filters and program your thermostat, seal and insulate your home, and support clean energy sources

By Reducing Coastal Acidification

Reduce your use of fertilizers, Improve sewage treatment and run off, and Protect and restore coastal habitats

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You've taken the first step to learn more about ocean acidification - why not spread this knowledge to your community?

Every community has their unique culture, economy and ecology and what’s at stake from ocean acidification may be different depending on where you live.  As a community member, you can take a larger role in educating the public about ocean acidification. Creating awareness is the first step to taking action.  As communities gain traction, neighboring regions that share marine resources can build larger coalitions to address ocean acidification.  Here are some ideas to get started:

  1. Work with informal educators, such as aquarium outreach programs and local non-profits, to teach the public about ocean acidification. Visit our Education & Outreach page to find the newest tools!
  2. Participate in habitat restoration efforts to restore habitats that help mitigate the effects of coastal acidification
  3. Facilitate conversations with local businesses that might be affected by ocean acidification, building a plan for the future.
  4. Partner with local community efforts to mitigate the driver behind ocean acidification  – excess CO2 – such as community supported agriculture, bike & car shares and other public transportation options.
  5. Contact your regional Coastal Acidification Network (CAN) to learn how OA is affecting your region and more ideas about how you can get involved in your community
       More for Taking Community Action