Table 2.
Coefficient estimates for carbon sediment variables in the GLS spatial models.
| Depth | Dependent variable | Corg (%) | C stocks (mg Corg cm−3) | δ13C (‰) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Driver | ∆AIC | Estimate | SE | ∆AIC | Estimate | SE | ∆AIC | Estimate | SE | |
| 0–1 cm | Seagrass cover* | 38.75 | 0.00 | 0.00 | 30.61 | 0.00 | 0.00 | 63.93 | 0.03 | 0.01 |
| <63 µm* | 12.28 | 0.01 | 0.00 | 18.44 | 0.00 | 0.00 | 47.21 | −0.01 | 0.01 | |
| Distance from mangroves* | 36.74 | 0.00 | 0.00 | 33.64 | 0.00 | 0.00 | 71.45 | 0.00 | 0.00 | |
| Turbidity (low) | 22.78 | 0.55 | 0.34 | 19.26 | 2.23 | 0.64 | 36.68 | −20.14 | 0.83 | |
| Turbidity (medium) | 22.78 | −0.20 | 0.27 | 19.26 | −0.12 | 0.29 | 36.68 | −2.09 | 0.42 | |
| Turbidity (high) | 22.78 | 0.42 | 0.39 | 19.26 | 0.16 | 0.40 | 36.68 | −4.05 | 0.57 | |
| Meadow type (continuous) | 24.38 | 0.51 | 0.47 | 5.34 | 2.52 | 0.17 | 24.64 | −19.94 | 0.96 | |
| Meadow type (patchy) | 24.38 | 0.42 | 0.55 | 5.34 | 0.20 | 0.24 | 24.64 | −4.55 | 1.11 | |
| Meadow type (variable) | 24.38 | −0.19 | 0.56 | 5.34 | −0.90 | 0.27 | 24.64 | −1.12 | 1.24 | |
| 1–3 cm | Seagrass cover* | 28.51 | 0.00 | 0.00 | 7.64 | 0.00 | 0.01 | 61.09 | 0.04 | 0.01 |
| <63 µm* | 8.06 | 0.01 | 0.00 | 3.21 | 0.01 | 0.00 | 48.06 | 0.00 | 0.01 | |
| Distance from mangroves* | 30.54 | 0.00 | 0.00 | 8.57 | 0.00 | 0.00 | 60.62 | 0.00 | 0.00 | |
| Turbidity (low) | 17.52 | 0.34 | 0.32 | 9.27 | 1.61 | 1.29 | 29.26 | −19.11 | 0.76 | |
| Turbidity (medium) | 17.52 | 0.12 | 0.27 | 9.27 | 0.44 | 0.40 | 29.26 | −2.95 | 0.87 | |
| Turbidity (high) | 17.52 | 0.67 | 0.38 | 9.27 | 0.50 | 0.51 | 29.26 | −5.93 | 0.95 | |
| Meadow type (continuous) | 19.21 | 0.46 | 0.43 | 2.87 | 2.47 | 0.20 | 21.41 | −19.95 | 0.46 | |
| Meadow type (patchy) | 19.21 | 0.50 | 0.50 | 2.87 | 0.21 | 0.27 | 21.41 | −4.71 | 0.62 | |
| Meadow type (variable) | 19.21 | −0.19 | 0.52 | 2.87 | −0.65 | 0.31 | 21.41 | −1.67 | 0.74 | |
| 3–10 cm | Seagrass cover* | 26.84 | −0.01 | 0.00 | 13.19 | −0.01 | 0.01 | 48.87 | 0.04 | 0.01 |
| <63 µm* | 8.94 | 0.01 | 0.00 | 9.92 | 0.00 | 0.00 | 55.64 | 0.00 | 0.01 | |
| Distance from mangroves* | 27.19 | 0.00 | 0.00 | 11.85 | 0.00 | 0.00 | 69.80 | 0.00 | 0.00 | |
| Turbidity (low) | 16.28 | 0.38 | 0.31 | 13.04 | 1.62 | 1.53 | 31.19 | −18.97 | 1.10 | |
| Turbidity (medium) | 16.28 | 0.19 | 0.27 | 13.04 | 0.63 | 0.48 | 31.19 | −3.74 | 1.15 | |
| Turbidity (high) | 16.28 | 0.56 | 0.37 | 13.04 | 0.38 | 0.61 | 31.19 | −5.95 | 1.29 | |
| Meadow type (continuous) | 16.56 | 0.45 | 0.42 | 6.94 | 2.60 | 0.24 | 36.75 | −20.34 | 0.80 | |
| Meadow type (patchy) | 16.56 | 0.49 | 0.49 | 6.94 | 0.12 | 0.33 | 36.75 | −4.47 | 0.95 | |
| Meadow type (variable) | 16.56 | −0.19 | 0.47 | 6.94 | −0.89 | 0.37 | 36.75 | −1.69 | 1.08 | |
Significant terms (p-value < 0.05) are shown in bold. ∆AIC represents the AIC difference between the non-spatial GLS and the spatial GLS accounting for spatial autocorrelation on the response variable; positive value means lower AIC on the spatial GLS model. SE, standard error. (*) shows continuous explanatory variables.