marine calcifiers?

[Nina2009]

any russian equivalent?

The report acknowledges that the precise effects are not yet clear, but it is thought that when atmospheric CO2 reaches 450 ppm, large areas of the polar oceans will likely have become corrosive to shells of key marine calcifiers, an effect that will be strongest in the Arctic

[masizonenko]

"Морские организмы, накапливающие кальций (в своих тканях)", "организмы-накопители кальция". По теме см. http://en.wikipedia.org/wiki/Ocean_acidification.