15 3 Powerpoint Earth
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15 3 Powerpoint Earth

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15 3 Powerpoint Earth 15 3 Powerpoint Earth Presentation Transcript

  • 15.3 Oceanic Productivity
  • Primary productivity- the production of organic compounds from inorganic substances through photosynthesis or chemosynthesis.
  • Photosynthesis- the use of light energy to convert water and carbon dioxide into energy-rich glucose molecules.
  • Chemosynthesis- the process by which certain microorganisms create organic molecules from inorganic nutrients using chemical energy.
  • Two factors influence a region’s photosynthetic productivity: the availability of nutrients and the amount of solar radiation, or sunlight.
  • The availability of solar energy is what limits photosynthetic productivity in polar areas.
  • Productivity in tropical regions is limited by the lack of nutrients
  • In temperate regions, which are found at mid-latitudes, a combination of sunlight and nutrient supply controls productivity.
  • Trophic Levels- a nourishment level un a food chain; plant and algae producers constitute the lowest level, followed by herbivores and a series of carnivores at progressively higher levels
    The transfer of energy between trophic levels is very inefficient
  • A food chain is a sequence of organisms through which energy is transferred, starting with the primary producer.
  • Animals that feed through a food web rather than a food chain are more likely to survive because they have alternate foods to eat should one of their food sources diminish of disappear