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Subtidal Community

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

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Subtidal Community

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  1. Subtidal Community Soft Bottom SAV (eelgrass)

  2. Figure 10.22

  3. 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)

  4. 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

  5. Subtidal Zone • Soft Bottom Communites • Seagrass Beds (NOW) • Hard Bottom Communites • Kelp Forests (previously viewed)

  6. 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

  7. Figure 13.17

  8. Ecological Targets Seagrass Meadows Hard Clams

  9. Seagrass Beds • Slow down currents • Increase the depositing of sediments • Have roots - can absorb nutrients from the sediment

  10. Seagrass Beds • Important nursery for juvenile animals • Bay scallop on Long Island

  11. Fig. 13.18

  12. Figure 13.16 Generalized food web in a seagrass community

  13. …go to… • SAV ppt • SAV/Fire Island ppt • SAV/Global Climate Change ppt

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