Table 1. Measured pH and dissolved oxygen of OA experiments on Palmyra Atoll.
The mean (±SE) measured pHSW and dissolved oxygen conditions for CO2 enrichment experiments conducted on Palmyra Atoll from 2009–2012. Measurements were conducted at the same time of day (∼2000) for the duration of the experiment in empty control (no biological material), ambient air, and high pCO2 treatments. Daily means were calculated within a species (n = 4, 2009; n = 6, 2010; n = 5, 2011; n = 10, 2012), and then averaged across days (14 days, 2009; 9 days, 2010; 17 days, 2011; 15 days, 2012). DO, dissolved oxygen; pHSW, pH seawater scale.
| Treatment | Species | Temperature (°C) | DO (mg L−1) | pHSW |
|---|---|---|---|---|
| 2009 Experiments | ||||
| Ambient air | Control | 29.31 ± 0.07 | 4.95 ± 0.13 | 8.08 ± 0.02 |
| H. opuntia | 29.26 ± 0.08 | 4.57 ± 0.16 | 8.03 ± 0.04 | |
| H. taenicola | 29.29 ± 0.08 | 4.73 ± 0.12 | 7.99 ± 0.03 | |
| Lithophyllum sp. | 29.43 ± 0.03 | 5.17 ± 0.11 | 8.05 ± 0.01 | |
| L. prototypum | 29.38 ± 0.02 | 5.16 ± 0.16 | 8.04 ± 0.02 | |
| High pCO2 | Control | 29.33 ± 0.06 | 4.66 ± 0.26 | 7.68 ± 0.04 |
| H. opuntia | 29.23 ± 0.08 | 4.16 ± 0.21 | 7.63 ± 0.02 | |
| H. taenicola | 29.25 ± 0.07 | 4.38 ± 0.19 | 7.62 ± 0.02 | |
| Lithophyllum sp. | 29.41 ± 0.03 | 5.47 ± 0.10 | 7.68 ± 0.03 | |
| L. prototypum | 29.38 ± 0.02 | 4.71 ± 0.21 | 7.65 ± 0.02 | |
| 2010 Experiments | ||||
| Ambient air | Control | 29.25 ± 0.15 | 4.85 ± 0.05 | 8.06 ± 0.05 |
| A. spicifera | 29.22 ± 0.07 | 4.86 ± 0.06 | 8.08 ± 0.04 | |
| C. serrulata | 28.95 ± 0.04 | 4.79 ± 0.13 | 8.09 ± 0.02 | |
| G. rugosa | 29.25 ± 0.02 | 4.92 ± 0.06 | 8.09 ± 0.02 | |
| H. taenicola | 29.36 ± 0.05 | 4.78 ± 0.07 | 7.98 ± 0.04 | |
| High pCO2 | Control | 29.25 ± 0.05 | 4.70 ± 0.30 | 7.79 ± 0.13 |
| A. spicifera | 29.10 ± 0.05 | 4.57 ± 0.18 | 7.88 ± 0.05 | |
| C. serrulata | 28.91 ± 0.03 | 4.30 ± 0.17 | 7.77 ± 0.06 | |
| G. rugosa | 29.21 ± 0.07 | 4.50 ± 0.28 | 7.87 ± 0.06 | |
| H. taenicola | 29.34 ± 0.06 | 4.69 ± 0.13 | 7.77 ± 0.11 | |
| 2011 Experiments | ||||
| Ambient air | Control | 28.46 ± 0.21 | 7.98 ± 0.08 | 7.99 ± 0.06 |
| C. serrulata | 28.34 ± 0.06 | 7.93 ± 0.03 | 8.00 ± 0.02 | |
| D. bartayresiana | 28.35 ± 0.01 | 7.97 ± 0.04 | 8.04 ± 0.02 | |
| H. pannosa | 28.26 ± 0.18 | 7.68 ± 0.04 | 7.98 ± 0.11 | |
| D. marginata | 28.44 ± 0.10 | 7.86 ± 0.06 | 8.05 ± 0.01 | |
| H. opuntia | 28.87 ± 0.04 | 8.12 ± 0.04 | 7.97 ± 0.03 | |
| Lithophyllum sp. | 28.92 ± 0.14 | 7.87 ± 0.05 | 8.03 ± 0.06 | |
| High pCO2 | Control | 28.30 ± 0.16 | 8.02 ± 0.08 | 7.76 ± 0.06 |
| C. serrulata | 28.86 ± 0.09 | 7.85 ± 0.02 | 7.66 ± 0.03 | |
| D. bartayresiana | 28.39 ± 0.01 | 7.93 ± 0.03 | 7.76 ± 0.02 | |
| H. pannosa | 28.38 ± 0.04 | 7.68 ± 0.22 | 7.86 ± 0.04 | |
| D. marginata | 28.87 ± 0.21 | 7.87 ± 0.05 | 7.80 ± 0.03 | |
| H. opuntia | 28.87 ± 0.09 | 8.39 ± 0.09 | 7.69 ± 0.03 | |
| Lithophyllum sp. | 28.46 ± 0.08 | 7.82 ± 0.07 | 7.74 ± 0.06 | |
| 2012 Experiments | ||||
| Ambient air | Control | 28.61 ± 0.10 | 7.81 ± 0.02 | 8.11 ± 0.03 |
| A. amadelpha | 28.72 ± 0.18 | 7.84 ± 0.02 | 8.02 ± 0.01 | |
| H. taenicola | 28.76 ± 0.08 | 7.90 ± 0.05 | 8.01 ± 0.03 | |
| High pCO2 | Control | 28.71 ± 0.07 | 7.81 ± 0.03 | 7.85 ± 0.08 |
| A. amadelpha | 28.68 ± 0.07 | 7.87 ± 0.08 | 7.75 ± 0.05 | |
| H. taenicola | 28.72 ± 0.18 | 7.98 ± 0.20 | 7.73 ± 0.06 | |