Oceanic Productivity 15.3
Primary Productivity
• The production of
organic matter
from inorganic
substances
through
photosynthesis or
chemosynthesis.
Photosynthesis
• The process by which plants, algae, and
certain prokaryotes use light energy to
convert water and carbon ...
Chemosynthesis
• The process by which certain microorganisms
use chemical energy to produce food.
Trophic Level
• A nourishment level
in a food chain; plant
and algae producers
constitute the lowest
level, followed by
he...
Food Chain
• A succession
of organisms
through which
food energy is
transferred,
starting with
primary
producers.
Food Web
• A group of interrelated food chains.
Key Concept
• What factors influence a region’s
photosynthetic productivity?
–Two factors influence a region’s
photosynthe...
Key Concept
• Describe the transfer efficiency
between trophic levels?
–The transfer of energy between trophic
levels is v...
Key Concept
• What advantages do organisms in a
food web have over those in a food
chain?
–Animals that feed through a foo...
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Earth science 15.3

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Earth science 15.3

  1. 1. Oceanic Productivity 15.3
  2. 2. Primary Productivity • The production of organic matter from inorganic substances through photosynthesis or chemosynthesis.
  3. 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. 4. Chemosynthesis • The process by which certain microorganisms use chemical energy to produce food.
  5. 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. 6. Food Chain • A succession of organisms through which food energy is transferred, starting with primary producers.
  7. 7. Food Web • A group of interrelated food chains.
  8. 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. 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. 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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