Seagrass in waters Indonesia ecosystems commonly found in tidal areas, and coral islands. Seagrass habitat may be mud, sand and coral death. The most important intertidal seagrass cover zone lower and upper subtidal vegetation formed which reaches 7-8 types (mixed vegetation). Vegetation can also be found in a protected area, near the muddy mangrove habitat, and sediment deposition on the rocks or slopes steep with unstable sediment. Seagrasses live on various kinds of sediment types ranging from mud up the sediments which consists of 40% silt and fine mud. Needs a major substrate for the development of seagrass beds is sufficient sediment depth. The role of depth and substrate in stability sediment includes two things: crop protection of ocean currents, and the processing and nutrient intake (Dahuri, 1996)
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