Table 1. Changes in percent cover of the main benthic taxonomic and functional categories, in response to pHT (median per tile), Reef (contrasting Dobu against Upa-Upasina) and Time (contrasting 13 against five months of deployment).
| Estimate | SE | t | p | |
|---|---|---|---|---|
| Non-calcifying algae up | ||||
| Intercept | 18.88 | 3.13 | 6.04 | <0.001 |
| pH | -2.35 | 0.39 | -5.94 | <0.001 |
| Reef | -0.45 | 0.13 | -3.49 | <0.001 |
| Non-calcifying algae low | ||||
| Intercept | 40.36 | 4.42 | 9.13 | <0.001 |
| pH | -5.20 | 0.56 | -9.20 | <0.001 |
| Time | 16.61 | 6.79 | 2.45 | 0.016 |
| pH:Time | -2.17 | 0.87 | -2.50 | 0.014 |
| Green filaments up* | ||||
| Intercept | 10.91 | 2.59 | 4.21 | <0.001 |
| pH | -1.60 | 0.33 | -4.88 | <0.001 |
| Reef | 0.79 | 0.13 | 6.15 | <0.001 |
| Time | -0.45 | 0.11 | -4.02 | <0.001 |
| Turf up | ||||
| Intercept | -0.68 | 0.13 | -5.15 | <0.001 |
| Reef | -0.93 | 0.17 | -5.48 | <0.001 |
| Time | 0.51 | 0.17 | 3.01 | 0.003 |
| Turf low | ||||
| Intercept | -1.38 | 0.07 | -18.43 | <0.001 |
| Time | -1.15 | 0.14 | -7.82 | <0.001 |
| Macroalgae low* | ||||
| Intercept | 26.84 | 4.85 | 5.54 | <0.001 |
| pH | -4.18 | 0.61 | -6.83 | <0.001 |
| Reef | 2.57 | 0.59 | 4.31 | <0.001 |
| Time | 1.55 | 0.25 | 6.17 | <0.001 |
| Cyanobacteria low* | ||||
| Intercept | 67.31 | 12.79 | 5.26 | <0.001 |
| pH | -8.79 | 1.63 | -5.40 | <0.001 |
| Reef | -31.41 | 16.50 | -2.33 | 0.021 |
| Time | -0.32 | 0.17 | -1.91 | 0.057 |
| pH: Reef | 3.99 | 1.72 | 2.32 | 0.022 |
| Peyssonnelia up | ||||
| Intercept | 14.50 | 4.27 | 3.40 | <0.001 |
| pH | -2.38 | 0–55 | -4.33 | <0.001 |
| Time | 1.74 | 0.26 | 6.65 | <0.001 |
| Peyssonnelia low | ||||
| Intercept | 26.73 | 11.26 | 2.37 | 0.019 |
| pH | -3.64 | 1.43 | -2.54 | 0.012 |
| Reef | -33.07 | 12.82 | -2.58 | 0.011 |
| Time | 17.11 | 16.46 | 1.04 | 0.300 |
| pH: Reef | 4.15 | 1.63 | 2.54 | 0.012 |
| pH: Time | -2.02 | 2.08 | -0.97 | 0.334 |
| Reef: Time | -72.00 | 19.88 | -3.62 | <0.001 |
| pH: Reef: Time | 9.04 | 2.52 | 3.59 | <0.001 |
| CCA up | ||||
| Intercept | -64.69 | 6.86 | -9.43 | <0.001 |
| pH | 7.89 | 0.86 | 9.13 | <0.001 |
| Reef | 1.65 | 0.21 | 7.75 | <0.001 |
| Time | 27.24 | 8.96 | 3.04 | 0.003 |
| pH: Time | -3.37 | 1.13 | -2.99 | 0.003 |
| Reef: Time | -0.95 | 0.30 | -3.17 | 0.002 |
| CCA low | ||||
| Intercept | -53.013 | 8.45 | -6.28 | <0.001 |
| pH | 6.47 | 1.06 | 6.08 | <0.001 |
| Reef | -93.28 | 23.06 | -4.04 | <0.001 |
| Time | -0.26 | 0.17 | -1.56 | 0.122 |
| pH: Reef | 11.64 | 2.89 | 4.03 | <0.001 |
| Reef: Time | 1.08 | 0.27 | 4.03 | <0.001 |
| Non-calcifying invertebrates low* | ||||
| Intercept | -20.90 | 5.71 | -3.66 | <0.001 |
| pH | 2.16 | 0.72 | 3.00 | 0.003 |
| Reef | 1.29 | 0.37 | 3.48 | <0.001 |
| Time | 1.34 | 0.37 | 3.59 | <0.001 |
| Reef: Time | -1.36 | 0.46 | -2.95 | 0.004 |
| Calcifying invertebrates low* | ||||
| Intercept | -50.90 | 15.48 | -3.29 | 0.001 |
| pH | 6.00 | 1.95 | 3.08 | 0.002 |
| Reef | 42.69 | 16.64 | 2.57 | 0.011 |
| Time | 1.02 | 0.29 | 3.47 | <0.001 |
| pH: Reef | -5.35 | 2.10 | -2.55 | 0.012 |
| Reef: Time | -1.03 | 0.41 | -2.50 | 0.013 |
| Ascidians low* | ||||
| Intercept | -98.37 | 33.45 | -2.94 | 0.004 |
| pH | 12.00 | 4.20 | 2.86 | 0.005 |
| Reef | 77.74 | 34.19 | 2.27 | 0.024 |
| pH: Reef | -9.65 | 4.29 | -2.25 | 0.026 |
| Polychaetes low (counts per tile)* | ||||
| Intercept | -1395.59 | 436.92 | -3.19 | 0.002 |
| pH | 188.78 | 55.35 | 3.41 | 0.001 |
| Reef | -39.26 | 17.84 | -2.20 | 0.031 |
| Unoccupied space up | ||||
| Intercept | -0.66 | 0.09 | -7.41 | <0.001 |
| Reef | -0.62 | 0.14 | -4.51 | <0.001 |
| Time | -1.49 | 0.20 | -7.53 | <0.001 |
| Reef: Time | 1.11 | 0.25 | 4.43 | <0.001 |
| Unoccupied space low | ||||
| Intercept | -13.83 | 4.42 | -3.13 | 0.002 |
| pH | 1.61 | 0.56 | 2.88 | 0.004 |
| Reef | -0.78 | 0.19 | -4.04 | <0.001 |
| Time | -1.76 | 0.27 | -6.47 | <0.001 |
| Reef: Time | 0.98 | 0.37 | 2.65 | 0.009 |
Responses are for the upper (up) and lower (low) sides of the settlement tiles. Parameter estimates from the best fitting generalised linear models, with quasibinomial distributions. Non-significant terms removed from final models.
* indicates taxa only found on one tile side.