1. Food Web Dynamics and Productivity Movement In Ecosystems
Big Idea 4: Biological Systems Interact

2. Essential Knowledge
4.A.6: Interactions among living systems and with their environment result in the movement of matter and energy.

3. Energy Flows in Ecosystem
Producers
Consumers
Decomposers

4. Producers: Phototrophs
Use sun to produce sugar (PS)
Plants, Algae (Phytoplankton), Bacteria
PS is 1 % efficient!

5. Producers: Chemotrophs Use H2S to produce sugars (chemosynthesis)
Bacteria

6. Consumers: Heterotrophs
Break down stored sugars (aerobic respiration)
C6H H2O + 6O2 
6CO2 +12H2O+ Energy (36 ATP)

7. Primary producers get eaten by….
Simplified Food Chain
Primary producers get eaten by….

8. Primary consumers get eaten by…
Simplified Food Chain
Primary consumers get eaten by…

9. Secondary consumers get eaten by…
Simplified Food Chain
Secondary consumers get eaten by…

10. Tertiary consumers get eaten by…
Simplified Food Chain
Tertiary consumers get eaten by…

14. Importance of Decomposers
Make vital elements available to primary producers.
 Convert organic material into inorganic materials (producers can use in soil/ H2O)

15. Are dependent upon primary productivity!!!
Food Chains and Webs
Are dependent upon primary productivity!!!

16. Gross Primary Productivity (GPP)
Rate at which energy is captured during PS and stored.
LOW
HIGH

17. Net Primary Productivity (NPP)
Energy that remains in producers after respiration; biomass available to consumers
NPP =
GPP - Resp.
Energy that is available to consumers!

19. Math Calculations! 15 minutes

20. Energy Flows, But Matter is Recycled
Energy Flows, But Matter is Recycled! Biogeochemical Cycles: C, N, and Water

23. Nitrogen Cycle Video Clip
Science Girls…