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Benthic and Rocky Shore Environments 5/3/2017 © 2011 Pearson Education, Inc. Ocean Life Zones • Bio-zones – Pelagic (Water) – Benthic (Bottom) – The Rocky Shore is found in the Neritic, Supra and Sub littoral zones Distribution of Benthic/Rocky Shoreline Organisms • Benthic (ocean bottom dwelling) organisms live mainly on continental shelves. • Their distribution is affected by surface and deep ocean currents. Distribution of Benthic and Rocky Shoreline Organisms Communities on Rocky Shores Tidal Zonation • Rocky shore: • Spray Zone • Intertidal Zone (MTZ) (high tide to low tide) • Sub Low Tide Zone Spray Zone • Supratidal Zone • Organisms – Avoid drying out – Many animals have shells – Few species of marine algae Intertidal Zone Organisms • High Tide Zone • Animals have shells to avoid drying out • Marine algae—rock weeds with thick cell walls Intertidal Zone Organisms • Middle tide zone • More types of marine algae (sea weed) • Soft-bodied animals Intertidal Zone Organisms • Low Tide zone • Abundant algae • Many animals hidden by sea weed and sea grass • Crabs abundant in all intertidal zones