| The Posidonia oceanica meadow represents over one quarter of the photophilous biotopes of the Mediterranean infralittoral. |
| The Rayolet site is very heterogeneous, characterized by Posidonia oceanica seagrass meadows, rocks covered with photophilous algae, some areas of gravel, and patches of sand. |
| The biocenosis of photophilous algae is a biocenosis that is extremely rich and of great complexity, due to the strong physical gradients existing at its level. |
| Betula nana is a photophilous species, which prefers open spaces that are not overgrown by trees. |
| This association, described by Molinier in 1958, forms belts in the photophilous biotopes where there is strong wave action, and whose rocky substratum is subvertical. |
| The fairly deep bowls of the platforms constitute enclaves for a flora and a fauna that belong to the biocenosis of photophilous algae. |
