Ch 9 ppt

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Ch 9 ppt

  1. 1. Chapter 9 Biological Productivity and Energy Flow Case Study: Can Enough Food be Produced for Africa??? How much can we grow??? What will be our Carrying Capacity?????
  2. 2.  The total amt of organic matter in an ecosystem =  It increases though growth Plants, animals and dead are all biomass
  3. 3.  Biomass is measured in  It increases through growth.  This is
  4. 4. Chemoautotrophs  Bacteria that use inorganic compounds (like sulfur) to make their own food and tissues The white-ish area is a bacterial mat feeding on methane from beneath the ocean floor. Hydrothermal vents
  5. 5. Energy flow  Ecosystems are all open to energy flow Energy in food chain heat released  What is not used is lost (as heat), or stored!!!!
  6. 6.  1. kinetic-  2. potential-  energy can move back and forth between the two  Entropy-is the measure of disorder, wasted energy - becomes more random, can be sound or light but is mostly heat, everything always moves towards entropy
  7. 7. The laws of thermodynamics  1st Law – conservation of energy
  8. 8.  2nd Law- entropy increases  -energy moves to a less organized form (living cells are holding off the forces of entropy by channeling energy).
  9. 9.  Energy flow is one way!
  10. 10. Energy efficiency  How efficient are orgs at using energy?  Not very!  Rule of thumb is:
  11. 11. Biomass Pyramid

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