1. Starter Using the data provided, draw a pyramid of productivity.
What are the units for productivity? – include them
What does productivity represent in organisms?
How much energy passes from one trophic level to the next?
Trophic Level
Productivity (units?)
Producers
5000
Primary consumers
500
Secondary consumers 50
Tertiary consumers 5

2. Learning outcomes You should all be able to:
Define gross productivity, net productivity, primary productivity and secondary productivity
Most of you should be able to:
Calculate the values of gross and net productivity from given data

3. What is productivity?
Thinking about ecosystems – how do you think we measure productivity?

4. There are two types of productivity
Primary
Secondary
What do you think the difference is?
Discuss it with a partner now write down your idea on the sheet

5. Primary Productivity - plants
Conversion of solar energy
Carbon dioxide from the atmosphere
Water from the soil
Oxygen released
Sunlight

6. What factors affect primary productivity?
Amount of sunlight
Availability of factors needed for growth
Levels of insolation
Supply of water
Temperature
Nutrient levels
Efficiency of producers

7. Secondary Productivity - animals

8. These two types can be divided…
Gross productivity
Net productivity
What do you think the difference is?
Gross productivity is the total gain in energy or biomass per unit area per unit time
Net productivity is the remaining energy that is available to the next trophic level.

9. GPP and NPP What can you see happening in the diagram?
How would you calculate GPP and NPP?

10. GSP and NSP

11. pyramid of productivity
GROUP ACTIVITY

12. Starter What does NPP stand for? What does it mean?
How would you calculate it?
What about GSP?

13. pyramid of productivity

19. NPP - Low
Arctic Tundra
Sonoran Desert

20. NPP - High
Tropical Rainforest

21. Checking outcomes
What is net productivity and gross productivity? What is primary and secondary productivity? How can you calculate NPP? How can you calculate GSP?