These slow growing biogenic structures are formed by long-lived coralline algae that absorb a wide spectrum of light, provide energy to the system and contribute to nutrient cycles. They can occur in shallow or intermediates depths with coarse gravel, sandy or mixed muddy substrates. The carbonate structures of living and dead rhodoliths, and the spatial (depth gradient) and temporal (diurnal and seasonal) variation in the environmental conditions provide habitat for diverse communities of macroinvertebrates and fish, along with other characteristic sessile organisms like algae and sponges. Storms, waves and other disturbances drive cycles of restructuring and slow recovery.