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Earth science 15.3

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Transcript

  • 1. Oceanic Productivity 15.3
  • 2. Primary Productivity
    The production of organic matter from inorganic substances through photosynthesis or chemosynthesis.
  • 3. Photosynthesis
    The process by which plants, algae, and certain prokaryotes use light energy to convert water and carbon dioxide into energy-rich glucose molecules.
  • 4. Chemosynthesis
    The process by which certain microorganisms use chemical energy to produce food.
  • 5. Trophic Level
    A nourishment level in a food chain; plant and algae producers constitute the lowest level, followed by herbivores and series of carnivores at progressively higher levels.
  • 6. Food Chain
    A succession of organisms through which food energy is transferred, starting with primary producers.
  • 7. Food Web
    A group of interrelated food chains.
  • 8. Key Concept
    What factors influence a region’s photosynthetic productivity?
    Two factors influence a region’s photosynthetic productivity: the availability of nutrients and the amount of solar radiation, or sunlight.
  • 9. Key Concept
    Describe the transfer efficiency between trophic levels?
    The transfer of energy between trophic levels is very inefficient. The average amount of energy transferred between trophic levels is roughly 2 percent.
  • 10. Key Concept
    What advantages do organisms in a food web have over those in a food chain?
    Animals that feed through a food web rather than a food chain are more likely to survive because they have alternative foods to eat should one of their food sources diminish or disappear.