The calcium carbonate (CaCO3) in coral reefs and in the shells of other marine calcifiers comes in two different mineral forms: calcite and aragonite. (reefresilience.org)
Marine calcifiers exhibit mixed responses to CO2 - induced ocean acidification. (joannenova.com.au)
The reduction of available carbonate ions is a problem for marine calcifiers (corals, crustaceans, and mollusks) who need the carbonate ions to build their shells and skeletons. (reefresilience.org)