Earth science 15.2

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Earth science 15.2

  1. 1. The Diversity of Ocean Life 15.2
  2. 2. Plankton • Passively drifting or weak swimming organisms that cannot move independently of ocean currents.
  3. 3. Phytoplankton • Algal plankton, the most important community of primary producers in the ocean.
  4. 4. Zooplankton • Animal plankton.
  5. 5. Nekton • Organisms that can move independently of ocean currents by swimming or other means of propulsion.
  6. 6. Benthos • The forms of marine life that live on or in the ocean bottoms.
  7. 7. Photic Zone • The upper part of the ocean into which sunlight penetrates.
  8. 8. Intertidal Zone • The area where land and sea meet and overlap; the zone between high and low tides.
  9. 9. Neritic Zone • The marine-life zone that extends from the low-tide line out to the shelf break.
  10. 10. Oceanic Zone • The marine-life zone beyond the continental shelf.
  11. 11. Pelagic Zone • Open ocean of any depth; animals in this zone swim or float freely.
  12. 12. Benthic Zone • Othe marine-life zone that includes any sea- bottom surface regardless of its distance from shore.
  13. 13. Abyssal Zone • A subdivision of the benthic zone characterized by extremely high pressures, low temperatures, low oxygen, few nutrients, and no sunlight.
  14. 14. Key Concept • How can marine organisms be classified? –Marine organisms can be classified according to where they live and how they move.
  15. 15. Key Concept • What is the difference between plankton and nekton? –Plankton drift with ocean currents and Nekton swim independently of the ocean currents.
  16. 16. Key Concept • In which area of the ocean can most benthos organisms be found living? –Most benthos organisms are living on or in the ocean bottom.
  17. 17. Key Concept • What factors are used to divide the ocean into marine life zones? –Three factors are used to divide the ocean into distinct marine life zones: the availability of sunlight, the distance from shore, and water depth.

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