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. 2012 Aug 28;7(8):e43843. doi: 10.1371/journal.pone.0043843

Figure 3. Relationship between net calcification or percent cover analyses on CAUs and relevant pH metrics.

Figure 3

a) Means (± SE) of net reef calcification for total CaCO3 and each polymorph of CaCO3 against mean (± SE) daily ∑ pH·hrs above pHcsl. Both total net accretion (Y = 6.86x +0.96; F = 7.78, R = 0.813, P = 0.0444) and high Mg calcite calcification rate (Y = 7.75x +0.47; F = 12.26, R = 0.868, P = 0.0249) are related to mean daily ∑ pH·hrs above pHcsl. b) Percent cover of all calcifiers and for each polymorph of CaCO3 against mean (± SE) daily ∑ pH·hrs above pHcsl. Only the percent cover of high Mg calcite is positively related to ∑ pH·hrs above pHcsl (Y = 83.81x +48.52; F = 12.747, R = 0.872, P = 0.0234). Percent cover of calcitic organisms is negatively related to ∑ pH·hrs above pHcsl (Y = 14.85–29.21x; F = 17.502, R = −0.902, P = 0.0139).