Figure 3
From: Sensitivity of planktic foraminiferal test bulk density to ocean acidification
Comparisons between CT and SEM images of G. bulloides tests (same individual), the densities of which were (a) high (obtained from St. 67, 0–50 m) and (b) low (obtained from St. 91, 100–150 m). SEM images of the cross section of the outermost chamber of G. bulloides show the ultrastructure of the outer and inner sides of each test. High-contrast photos of cross section ultrastructure are shown to emphasize the shadow area, indicating the amount of airspace in the test ultrastructure. The higher amount of airspace suggests the higher porosity of ultrastructure in test, which correspond to low CT number area in CT image.
