The relationship between various experimental concentrations of CO2 and calcification was studied by measuring Ca-45 incorporation into the crystalline matrix. Air containing CO2 at partial pressures (Pc02) of 0.04% to 5.5% was bubbled through synthetic sea water in incubation vessels. The resultant pH values ranged from 8.7 to 6.5. The relative concentrations ofCO2, HCO3 , and CO2— 3 were calculated from the measured ' pH—PCO2 combinations. Calcification was correlated positively with HCO expressed as percent of total carbon. Maximum calcification of about one—third above normal occurred between 0.1% and 1.0% P CCOO22 At 0.26% P calcification increased as increments of NaHCO3 in the range from CO2' 1 to 8 mM were added; this increase did not occur in the killed controls. The data suggest that calcification is controlled by a biological process that may be sensitive to pH and/or to the HCO3 concentration. The data also suggest that an increase in CO2 over the present atmospheric level would significantly increase calcification in this marine alga.
Ariel A. Roth
Arthur V. Chadwick
Conrad D. Clausen
Ivan G. Holmes
Elwood S. McCluskey
Doctor of Philosophy (PhD)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Coralline Algae; Calcification; Carbon Dioxide
Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Smith, A. Dwight, "The Effect of Carbon Dioxide Concentration on Calcification in the Red Coralline Alga BOSSIELLA ORBIGNIANA" (1977). Loma Linda University Electronic Theses, Dissertations & Projects. 947.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives