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Pictured here are porcelain crabs just before and after hatching. Organisms that live on the ocean floor (crabs, sea stars and oysters) experience daily variations in their pH (acidity) that are greater than those caused by increasing levels of carbon dioxide in the atmosphere. Researchers at San Francisco State University are working to find out how increases in ocean acidity, which changes slowly through time, compare with the daily variations in pH that seafloor organisms experience.
Image credit: Jonathon Stillman, SFSU
