Table 1. Mean DOC and DCNS concentrations in exudates, controls, and ambient reef water at the start of each experiment.
| Treatment | DOC (μmol C l−1) | DCNS (μmol C l−1) | DCNS yield | Mole % fucose | Mole % rhamnose | Mole % arabinose | Mole % galactose | Mole % glucose | Mole % mannose+xylose |
|---|---|---|---|---|---|---|---|---|---|
| Turbinaria | 180.7±0.8 | 39.8±8.6 | 22%±5% | 43%±5% | 3%±0% | 5%±6% | 22%±4% | 12%±5% | 15%±2% |
| Amansia | 177.4±0.6 | 12.0±0.2 | 7%±0% | 9%±1% | 10%±0% | 4%±0% | 32%±0% | 14%±1% | 31%±0% |
| Halimeda | 112.9±0.6 | 9.7±2.8 | 9%±3% | 8%±1% | 7%±2% | 4%±1% | 24%±0% | 24%±4% | 34%±1% |
| Porites | 78.4±3.0 | 8.1 | 10% | 9% | 4% | 3% | 19% | 30% | 35% |
| Control | 70.4±2.2 | 3.6±0.2 | 5%±0% | 9%±0% | 10%±1% | 5%±1% | 22%±3% | 29%±6% | 24%±6% |
| Ambient | 69.5±1.0 | 4.2±1.6 | 6%±2% | 9%±1% | 10%±1% | 6%±2% | 21%±3% | 30%±5% | 25%±7% |
Abbreviations: DCNS, dissolved combined neutral sugar; DOC, dissolved organic carbon.
DCNS yield is calculated as the molar ratio of DCNS carbon to total DOC. Mole % values are the ratio of each sugar concentration to the total DCNS concentration in moles of carbon (see Figure 1a for raw concentrations of each sugar). Each entry is the mean and s.d. of two replicate incubations (one Porites replicate was excluded from DCNS calculations as an outlier; see Figure 3). Treatments that differ significantly from the control (Dunnet's P<0.05) are emphasized in bold italics.