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Nutrient Cycles in Marine Ecosystems Part I

Nutrient Cycles in Marine Ecosystems Part I. Section 4. Surface Layer of Ocean. Dissolved nutrients Recall: algae require light for photosynthesis Intensity of light as depth Restricted to surface layer ( photic zone) Depth 30 m to 150 m

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Nutrient Cycles in Marine Ecosystems Part I

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  1. Nutrient Cycles in Marine Ecosystems Part I Section 4

  2. Surface Layer of Ocean • Dissolved nutrients • Recall: algae require light for photosynthesis • Intensity of light as depth • Restricted to surface layer (photic zone) • Depth 30 m to 150 m • Obviously less in turbid water (high turbidity)

  3. What is an ion? • atom or molecule in which the total number of electrons is not equal to the total number of protons, giving the atom a net positive (+) or negative (-) electrical charge.

  4. SOME Surface Layer Ions 1. Copy this table on the next page of your notebook. 2. Create a legible bar graph from the information above

  5. Surface Ions • Those ions, together with nitrate and phosphate ions form nutrients for growth of algae and other producers • RECALL: ppm • Nitrate and phosphate ions occur in low concentrations in seawater • Nitrate = 0.5 ppm • Phosphate = 0.07 ppm

  6. Replenishment of dissolved nutrients (3) • 1. Upwelling – movement of water from deep in the ocean to the surface layer, where nutrients become available to primary producers

  7. Causes of Upwelling • Deflection of deep water currents upwards • Nutrients sunk to sea floor brought back up to surface of ocean • Movement of water away from the coast by wind

  8. 2. Run-off from land • Part of hydrological cycle • Water leach nutrients (including nitrates and phosphates) from soil

  9. 3. Atmospheric Gases • CO2 dissolved in seawater forming hydrogencarbonate ions (HCO3-) • AKA bicarbonate • Makes CO2 available for fixation in photosynthesis for primary producers • N gas is fixed by blue-green algae in intertidal zones • Forms nitrogen-containing organic compounds • How nitrogen enters marine ecosystems

  10. Intertidal Zone Area above water during low tide but underwater during high tide

  11. Nitrogen Cycle

  12. Recycled • Nutrients like nitrates and phosphates are recycled at the ocean surface by excretion from zooplankton

  13. Depletion of dissolved nutrients • Uptake by primary producers like phytoplankton • Synthesis of organic substances • Example: nitrate ions used for synthesis of amino acids and proteins • Phytoplankton  zooplankton  small fish • Proteins passed to next trophic level and so forth

  14. Recall

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