Figure 3: Covariation between calcifying fluid parameters Ωcf versus seasonal temperature and pHcf versus DICcf. | Nature Communications

Figure 3: Covariation between calcifying fluid parameters Ωcf versus seasonal temperature and pHcf versus DICcf.

From: Coral calcification in a changing World and the interactive dynamics of pH and DIC upregulation

Figure 3

(a) Covariation of calcifying fluid saturation state (Ωcf) with reef-water temperature showing a five- to sixfold elevation in Ωcf relative to reef-waters for Porites corals from Davies Reef (D-2 and D-3) in the Great Barrier Reef and from Coral Bay (CB-1 and CB-2) in the Ningaloo Reef. Note the very narrow range (±5 to ±10%) of high Ωcf values for each colony. (b) Subparallel arrays of inversely correlated (r2=0.88–0.94) calcifying fluid pHcf and DICcf/DICsw values reflecting specific bio-environmental controls at the colony level on metabolic DICcf/DICsw. Seasonal variations in metabolic supplied DICcf are offset by opposing changes in pHcf that act to moderate the overall variations in Ωcf, the ultimate controller of skeletal growth rates.

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