FIGURE 3.

A. maculatum embryos compete with O. amblystomatis algae for bicarbonate. In each image, the y-axis represents radioactivity assayed per sample (DPM, disintegrations per minute); the x-axis represents the treatments. (A) Algae from whole eggs incubated in the light (L) or dark (D). (B) Cultured algae incubated in the light or dark with and without photosynthesis inhibitors (PI). (C) Carbon fixation by embryos in the whole egg environment, in the light or dark with and without photosynthesis inhibitors. n.s. = not significant, ^∗∗p < 0.01. Significance levels were determined by ANOVA followed by the Games-Howell post-hoc test.