Seawater chemistry data used to calculate rates of organism photosynthesis (P) and calcification (G).

<p>Organism level incubations. Data generated from an experimental coral reef community&nbsp;from Mo’orea, French Polynesia. Results are published in:</p>

<p>Lantz CA, Carpenter RC, Comeau S, Edmunds PJ. Organisms Composing an&nbsp;Experimental Coral Reef Community from&nbsp;Mo'orea, French Polynesia, Exhibit Taxon-Specific&nbsp;Net Production: Net Calcification Ratios. Frontiers in Marine Science.&nbsp;2017; 4( 298). doi:&nbsp;<a href=\"http://doi.org/10.3389/fmars.2017.00298\" target=\"_blank\">http://doi.org/10.3389/fmars.2017.00298</a></p>

<p>Please see publication for complete methodology.&nbsp;</p>

<p>Seawater samples were taken from each community and chamber at the beginning and end of each 3-h incubation (09:00 -12:00 hrs) and analyzed for temperature, salinity, total alkalinity (TA), and pH. Temperature was measured using a ThermoFisher Scientific Traceable Thermometer (± 0.01&nbsp;^oC) and salinity was measured using a conductivity meter (YSI 3100). Measurements of TA were made within 24 h of collection of seawater samples using open-cell potentiometric titrations (Dickson et al., 2007) on a Mettler Toledo T-50 titrator fitted with a DG115 pH electrode, and analyses were completed in duplicate using 50 mL seawater samples. Measurements of pH were performed using a spectrophotometric procedure with m-cresol dye, and calculated on the Total Scale (pH_T).</p>

<p>Values for dissolved inorganic carbon (DIC) were calculated from the measured TA, pH_T, salinity, and temperature using the R package seacarb (Lavigne and Gattuso, 2013).<strong>&nbsp;</strong>Net production (<em>P</em>, mmol C m^-2&nbsp;h^-1) and net calcification (<em>G</em>, mmol CaCO₃&nbsp;m^-2&nbsp;h^-1), were calculated from changes in DIC (ΔDIC) and TA (ΔTA) using equations from Gattuso et al. (1996).&nbsp; The ratio of&nbsp;<em>P/G</em>&nbsp;(mmol C mmol CaCO₃^-1), for both the community and each individual community member, was calculated by dividing each day’s measured&nbsp;<em>P</em>&nbsp;by the contemporaneously measured&nbsp;<em>G&nbsp;</em>(<em>P/G_ratio</em>). The slope of&nbsp;<em>P&nbsp;</em>regressed on<em>&nbsp;G</em>&nbsp;(mmol C mmol CaCO₃^-1), for both the community and each individual community member, was calculated from a best fit type II sum of squares residual model, in which all measures of&nbsp;<em>P</em>&nbsp;over the course of the study were regressed on&nbsp;<em>G&nbsp;</em>for the respective community (<em>P/G_slope</em>), or individual community members. Statistical analyses were performed with SPSS software (SPSS Inc. Version 22.0) running in a Windows environment, and the assumptions of normality and equality of variance were evaluated with graphical analyses of the residuals</p>