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Subtidal Community Soft Bottom SAV (eelgrass) Figure 10.22 Subtidal Zone • The part of the continental shelf that is always covered by water – from the low tide mark to the shelf break (150m or 490 ft) Subtidal Zone • Temperature varies from place to place due to its shallowness • Bottom still affected by waves, tides and currents • Very productive areas – nutrients & light Subtidal Zone • Soft Bottom Communites – Seagrass Beds (NOW) • Hard Bottom Communites – Kelp Forests (previously viewed) Seagrass Beds • Develop in sheltered shallow water • Most species prefer warm waters – Turtle Grass • Some are found in colder areas – Eelgrass (Zostera marina) our local species Figure 13.17 Ecological Targets Hard Clams Seagrass Meadows Seagrass Beds • Slow down currents • Increase the depositing of sediments • Have roots - can absorb nutrients from the sediment Seagrass Beds • Important nursery for juvenile animals – Bay scallop on Long Island Fig. 13.18 Figure 13.16 Generalized food web in a seagrass community …go to… • SAV ppt • SAV/Fire Island ppt • SAV/Global Climate Change ppt
