Three direct effects of increasing ocean acidification on marine plankton have been recognized: enhanced phytoplankton growth rate, changing elemental composition of primary produced organic matter, and reduced biogenic calcification.
Reference Library: Diatoms
This study analyzed changes in phytoplankton and zooplankton on the Newfoundland and Scotian shelves from 1962 to 2003 in relation to changes in oceanography. Three categories of phytoplankton (color, diatoms, dinoflagellates) increased in abundance in the 1990s, and these increases generally persisted into 2001–2003. This is believed to be a ...
Ocean acidification conditions reduced the amount of dissolved iron taken up by diatoms and coccolithophores. Iron is a limiting nutrient in large oceanic regions, and the ongoing acidification of seawater is likely to increase the iron stress of phytoplankton populations in some areas of the ocean. (Laboratory study)
A species of phytoplankton changed how it used carbon and energy when it was exposed to higher CO2 levels. The effects differed depending on whether the CO2 level change happened over 15-16 generations versus 33-57 generations. (Laboratory study)
Carbon dioxide partial pressure and vitamin B12 interactively influenced growth, carbon fixation, trace metal requirements, and trace metal net use efficiencies of the subarctic diatom Attheya sp. (Laboratory study)
The effect of ocean acidification on the fatty acid composition of a natural plankton community in the Arctic was studied in a large-scale mesocosm experiment, carried out in Kongsfjorden (Svalbard, Norway) at 79° N. Nine mesocosms of ~50 m3 each were exposed to 8 different pCO2 levels (from natural background conditions to ~1420 ...