Mangrove ecosystems

Mangroves support unique ecosystems, especially on their intricate root systems. In areas where roots are permanently submerged, mangroves may be host to a wide variety of organisms, including algae, barnacles, oysters, sponges, and bryozoans, which all require a hard substratum for anchoring while they filter feed. Mangrove crabs improve the nutritional quality of the mangle muds for other bottom feeders by mulching the mangrove leaves.( for more read wikipedia)