Table 1.
Means and standard deviations of metabolic rates and seagrass parameters for clipped plots, reference plots, naturally grazed areas, and ungrazed areas.
| Variable | Clipped | Reference | Grazed | Ungrazed | Test | P-value |
|---|---|---|---|---|---|---|
| GPP (mmol C m−2 d−1) | 64.4 ± 40.4a | 275.5 ± 69.9b | 36.1 ± 5.4 | 370.0 ± 15.0 | MEM | <0.0001 |
| RE (mmol C m−2 d−1) | 39.7 ± 27.4a | 154.6 ± 41.2b | 19.1 ± 9.9 | 160.4 ± 24.3 | MEM | <0.0001 |
| NEP (mmol C m−2 d−1) | 24.7 ± 37.6a | 119.5 ± 66.2b | 17.1 ± 6.4 | 209.5 ± 24.3 | MEM | 0.0004 |
| P:R | 2.3 ± 1.6a | 1.9 ± 0.6a | 2.4 ± 1.3a | 2.3 ± 0.4a | ANOVA | 0.16 |
| Shoot Density (shoots m−2) | 917.8 ± 85.1a | 840.0 ± 40.0 | 776.4 ± 31.8a | 785.8 ± 40.1 | t-test | 0.1408 |
| Blade Length (cm) | 4.8 ± 0.9a | 15.8 ± 1.5 | 1.9 ± 0.4b | 14.9 ± 2.8 | t-test | 0.0012 |
| Blade Width (cm) | 0.9 ± 0.1a | 0.9 ± 0.04 | 0.5 ± 0.1b | 1.0 ± 0.1 | t-test | 0.0004 |
| AG Biomass (g DM m−2) | 52.1 ± 16.5a | 259.4 ± 44.6 | 8.6 ± 4.3b | 193.8 ± 21.5 | t-test | <0.0001 |
| BG Biomass (g DM m−2) | 3880.7 ± 1256.3a | 3899.7 ± 1166.4a | 3562.4 ± 1002.6a | 4143.8 ± 961.7a | ANOVA | 0.611 |
Within a row, values that share a letter superscript are not significantly different. GPP: gross primary production; RE: ecosystem respiration; NEP: net ecosystem production; P:R: production to respiration ratio; AG: aboveground; BG: belowground; MEM: mixed effects model.