Figure 1

Multiple genotypes of massive Porites spp. stained with alizarin.

Representative colonies of (a) Porites lutea genotype 1; (b) Porites lutea genotype 2; (c) Porites murrayensis, cultured at ambient pCO₂ within our aquarium system. (d) Alizarin stain lines mark skeletal extension during the 5-week experimental period. Scale bars are 1mm.