Figure 6.20 Intertidal zone. Intertidal biomes are the coastal regions around the world that exist between the high tide and the low tide of the oceans. (a) Rocky coasts produce rocky intertidal habitats, such as this one along the Alaskan coast. (b) Muddy coasts produce mudflat habitats around the world, including this site off the coast of French Guiana.

Photos by (a) Mark Conlin/V&W/imagequestmarine.com; (b) Biosphoto/Thierry Montford.