The tidal ecosystem is the area between the low tide and the high tide. It is the damp part that is still damp after the wave has gone back out to sea.

It is important for animals because it brings food in and algae for crabs.

You can find tidal ecosystems at the St Kilda Mangroves. The St Kilda Mangroves are located north of outer harbour.

You will find crabs, barnacles, brittle stars, algae, small fish, rays, mussels and sea snails.