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Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
Earth science 15.3
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Earth science 15.3

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  • 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.

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