Fire Island's beach and intertidal invertebrate communities are an important component of the ecosystem which serves as forage for shore birds, includes several species from the taxonomic groups Annelida (Oligochaeta) and Amphipoda.

The horseshoe crab is an interesting and intriguing member of the phylum Arthropoda.

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USACE's Beach and Intertidal Invertebrate Study, January 2005, included a spring and fall survey in 2003 of the beach and intertidal invertebrate assemblages located along both the oceanside and bayside of the FIMP study area, inlcuding stations on Fire Island that had been sampled in 1995-96.

 Beach and Intertidal Invertebrate Study, January 2005
U. S. Army Corps of Engineers 

As a part of the U.S. Army Corps of Engineers (USACE) comprehensive study to identify, evaluate, and recommend longterm measures for hurricane storm damage reduction for the south shore of Long Island, New York from Fire Island Inlet to Montauk Point (FIMP), a number of environmental studies have been completed.