MARINE COMMUNITIES

While many marine animals move about independently, they are often associated in communities. The open coast, the interidal zone where there is periodic immersion and impact of waves, tide pools, protected bays, docks and bridges, estuaries, and mud flats, harbor groups of characteristic invertebrates. In this color film a large mussel shell supports a marine community of: brachiopods, tunicates, annelids, barnacles, echinoderms, coelenterates, a hermit crab is surmounted by a dense bryozoan colony.