Fig. 2 | Nature Communications

Fig. 2

From: Using B isotopes and B/Ca in corals from low saturation springs to constrain calcification mechanisms

Fig. 2

Porites astreoides internal CO32− and DICcf based on skeletal proxies. Coral skeletal B/Ca ratio a from naturally different seawater aragonite saturation state (Ωsw) sites were translated into internal calcifying carbonate ion concentration (CO32-) values b and dissolved inorganic carbon (DICcf) concentration, as well as upregulation compared to seawater (DICcf/DICsw) (c, d respectively). Circles represent values for each individual coral colony (mean ± confidence interval). Filled and non-filled symbols denotes the different locations: filled are the centres of the ojos with lower Ωsw and non-filled the control high Ωsw site. Triangles in c represent seawater DICsw concentrations. Dashed line represents regression line for site-specific significant different values for DICcf/DICsw with Ωsw (radj2 = 0.33, p = 0.029) and grey area denotes the 95% confidence band. Individual values are mean ± 95%-confidence interval

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