Table 5. Results of the nested ANOVA performed on log-transformed data comparing the densities of Arbacia lixula between protection levels (reserve vs. non-reserve), habitats (boulders vs. vertical walls) and sites (nested within protection and habitat) over several years (1995 to 2005 and 2009–2010).
| df | MS | F | p | |
| Protection | 1 | 0.226 | 0.87 | 0.363 |
| Habitat | 1 | 0.519 | 2.01 | 0.175 |
| Site (Protection*Habitat) | 7 | 0.982 | 5.70 | 0.000 |
| Year | 12 | 0.745 | 4.03 | 0.000 |
| Protection * Habitat | 1 | 0.049 | 0.19 | 0.668 |
| Protection * Year | 12 | 0.200 | 1.07 | 0.394 |
| Habitat * Year | 12 | 0.552 | 2.97 | 0.002 |
| Site (Protection*Habitat) * Year | 57 | 0.203 | 2.14 | 0.000 |
| Protection * Habitat *Year | 12 | 0.294 | 1.58 | 0.118 |
| Error | 1435 | 0.094 |