Ocean acidification, also known as “OA”, is the decrease in pH and calcium carbonate saturation state to increase dissolved carbon dioxide. As the climate changes, the associated ocean acidification brings a significant threat to the marine ecosystem. There is a study that analyzed the effect of seawater pH on survival rate of species groups in the California Current ecosystem, and estimated their sensitivity to OA, based on published studies. The study found that most functional groups responded negatively to OA conditions. California Current is a region susceptible to acidification because of the location. Using a database of all published paper on the response of temperate species to decreased pH, they developed relative magnitude of sensitivity to OA for marine functional groups in the California Current ecosystem. They also created a survival rate parameter for a functional group to pH condition of the environment research information. After reviewing some published papers, a database was built, and field studies on the response of temperate species to carbonate chemistry conditions. The database contains a total number of 847 studies and 3,158 responses for 285 species. There are 26 functional groups found to have negative relative survival scalars, as well as 8 had positive scalars, which means the survival rate of 26 functional groups in the California Current ecosystem decrease the pH, and the 8 functional groups got increased. The survival scalar that was developed, evaluate the relationship between survival rate and pH. The survival scalar was based on a score. And the foundation for the evidence scores was the response score, which is a scale of how well each response relates to survival of a functional group in the California Current Atlantis ecosystem model. They also caused pH survival sensitivity curves to change the functional group survival under acidification. As well as 4 heterotrophic groups had pH sensitivity curve slopes that increased with decreasing pH, implied a potential positive impact of ocean acidification, but the organization of this potential were unknown.
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