
Fig.5. The effects of extracellular calcium levels on crystal formation in planulae. Planulae were exposed to calcium-free SW (0mmoll-1; N=15), 9mmoll-1 Ca2+ SW (9mmoll-1; N=17) and 50mmoll-1 Ca2+ SW (50mmoll-1; N=10). *Significant difference compared with 9mmoll-1 Ca2+ SW (for comparison of 0mmoll-1 Ca2+ SW with 9mmoll-1 Ca2+ SW, P<0.001; for 50mmoll-1 Ca2+ SW with 9mmoll-1 Ca2+ SW, P<0.05). Values given as mean ± S.E.M.