Table 2 Effects of grazing and light intensity on the consumption of the native Stypopodium zonale and the non-native Grateloupia imbricata by Paracentrotus lividus as assessed in no-choice feeding assays
Source of variation | SS | df | MS | F | p | |
|---|---|---|---|---|---|---|
Stypopodium zonale | ||||||
 Grazing | <0.001 | 1 | <0.001 |  | 15.302 | <0.001 |
 Light | <0.001 | 5 | <0.001 |  | 1.856 | 0.111 |
 Light × Grazing | <0.001 | 5 | <0.001 |  | 2.451 | 0.040 |
Grateloupia imbricata | ||||||
 Grazing | <0.002 | 1 | <0.002 |  | 6.130 | 0.015 |
 Light | <0.002 | 5 | <0.001 |  | 1.102 | 0.365 |
 Light × Grazing | 0.002 | 5 | <0.001 |  | 1.610 | 0.166 |