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Natural Communities of St. Martins Marsh Aquatic Preserve Quick Topics
Hardbottom underwater habitat


Community Type Description
Algal Bed Large populations of nondrift macro or micro algae.
Composite Substrate Consist of a combination of natural communities such as "beds" of algae and seagrasses.
Mollusk Reef Expansive concentrations of sessile mollusks occurring in intertidal and subtidal zones to a depth of 40 feet.
Octocoral Bed Non-sessile benthic and pelagic invertebrates and vertebrates (e.g., sponges, mollusks, tube worms, burrowing shrimp, crabs, isopods, amphipods, sand dollars, and fishes) are associated with Octocoral Beds.
Seagrass Bed Expansive stands of vascular plants that occur in subtidal (rarely intertidal) zones, in clear, coastal waters where wave energy is moderate.
Sponge Bed Dense populations of sessile invertebrates of the phylum Porifera, Class Demospongiae.
Tidal Marsh Expanses of grasses, rushes and sedges along coastlines of low wave energy and river mouths. Also called saltmarsh.
Tidal Swamp Dense, low forests occurring along relatively flat shorelines of low wave energy. Also called mangrove forest.
Consolidated Substrate Solidified rock or shell conglomerates which include coquina, limerock or relic mollusk reef materials and may be sparsely inhabited by animal and plant species.
Unconsolidated Substrate Expansive, relatively open areas of subtidal, intertidal, and supratidal zones which lack dense populations of sessile plant and animal species.
Shell Mound An elevated mound of mollusk shells and aboriginal garbage on
which a hardwood, closed-canopy forest develops.



Last updated: March 01, 2014

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