As the world’s oceans get more acidic, Chesa­peake Bay oys­ters could be at risk.

A more acidic bay could make it more dif­fi­cult for mol­lusks, such as oys­ters, to build their shells through a process called cal­ci­fi­ca­tion. But it could help crus­taceans, such as blue crabs, build their shells more quickly, said Justin Ries, a pro­fessor at the Marine Sci­ence Center at North­eastern Uni­ver­sity in Boston.

This could dis­rupt the evo­lu­tionary bal­ance of the two, Ries said, because blue crabs prey on oysters.

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