The best estimates are that pH will decrease by 0.2 or 0.3 pH units in less than 100 years. Previous pH changes of this magnitude have probably occurred over thousands or even tens of thousands of years. However, when change occurs over short time scales (and 100 years is a short time scale in terms of the history of the Earth), there are increased risks of species extinctions.
Data Special Issue Title: Climate Change Handling Editors Marine ...
There is an article specifically discussing these scenarios and the foreseen behavior in the case of microbial derived productivity alone, would not be under strong alterations. Many other organisms, for sure! i.e. Corals and decalcification, or many other organisms not adapting quickly to lower O2 minimum concentrations.
http://www.nature.com/ismej/journal/v5/n1/full/ismej201079a.html
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