CO2 is a necessary part of photosynthesis. Increased CO2 helps promote photosynthesis. Photosynthesis generally powers the creation of carbonates by marine organisms but alarmists don't care and just want to throw words around like acidification to scare people. Since CO2 is more soluble in cold water, I would still expect that increased acidification would adversely affect cold water species more but this study seems to indicate that it isn't even affecting them. Very interesting.

Rising atmospheric CO2 and deliberate CO2 sequestration in the ocean change

seawater carbonate chemistry in a similar way, lowering seawater pH, carbonate ion

concentration and carbonate saturation state and increasing dissolved CO2 concentration.

These changes affect marine plankton in various ways. On the organismal

level, a moderate increase in CO2 facilitates photosynthetic carbon fixation of some

phytoplankton groups. It also enhances the release of dissolved carbohydrates, most

notably during the decline of nutrient-limited phytoplankton blooms. A decrease in

the carbonate saturation state represses biogenic calcification of the predominant

marine calcifying organisms, foraminifera and coccolithophorids. On the ecosystem

level these responses influence phytoplankton species composition and succession,

favouring algal species which predominantly rely on CO2 utilization. Increased

phytoplankton exudation promotes particle aggregation and marine snow formation,

enhancing the vertical flux of biogenic material. A decrease in calcification may affect

the competitive advantage of calcifying organisms, with possible impacts on their

distribution and abundance. On the biogeochemical level, biological responses to CO2

enrichment and the related changes in carbonate chemistry can strongly alter the

cycling of carbon and other bio-active elements in the ocean. Both decreasing calcification

and enhanced carbon overproduction due to release of extracellular carbohydrates

have the potential to increase the CO2 storage capacity of the ocean. Although

the significance of such biological responses to CO2 enrichment becomes increasingly

evident, our ability to make reliable predictions of their future developments and to

quantify their potential ecological and biogeochemical impacts is still in its infancy.

It's the other way around. Plankton can increase the CO2 uptake of the oceans. There's been some attempted geoengineering studies of the phenomenon, seeding the ocean with iron.

<>

That's not what they said. They said (and titled their paper) "High tolerance of microzooplankton to ocean acidification in an Arctic coastal plankton community".

In the same way that a study on droughts in Australia cannot be extrapolated to the rest of the world, a study on Arctic coastal plankton cannot be described (as you and über deniers and industry funded the Idso family do) as being applicable to all of the world's oceans.

Well CO2 Science is a denier site so they most likely take the most damaging info and bypass the reality

http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNG5_FehFCrBQeUaXdJNn4kzSomgZw&url=http://www.co2science.org/articles/V16/N43/C3.php

The six scientists report that they "found almost no direct effects of OA on microzooplankton composition and diversity," and that "both the relative shares of ciliates and heterotrophic dinoflagellates as well as the taxonomic composition of microzooplankton remained unaffected by changes in pCO2/pH."