Lam, P. J.. Princeton University, pjlam@princeton.edu
Tortell, P. J.. Princeton University, ptortell@princeton.edu
Morel, F. M.M.. Princeton University, morel@geo.princeton.edu

 
THE ROLE OF PCO2 IN INORGANIC CARBON USE IN THE COCCOLITHOPHORE EMILIANIA HUXLEYI
 
The cosmopolitan coccolithophore Emiliania huxleyi produces more calcite than any other species in the world. The process of calcification decreases alkalinity which leads to a local increase in PCO2 levels. The calcification reaction has been hypothesized to be a means by which coccolithophores increase internal CO2 concentrations for photosynthesis. Increases in surface PCO2 of the oceans due to anthropogenic emissions may reduce the need for calcification as a means of elevating internal CO2 in coccolithophores. Our preliminary field results have shown that water samples collected near Station P in the North Pacific exhibit a 50% decrease in particulate inorganic carbon production when incubated at higher PCO2 levels (750 ppm). We are currently investigating whether the calcification rate of laboratory strains of Emiliania huxleyi is directly dependent on ambient CO2 levels. We are also investigating a possible link between cobalt nutrition and carbon acquisition in E. huxleyi.
 
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
 
Code: CS55TH1022S