1. What is Productivity? Amount of solar energy provided to an ecosystem
Determines how much life can be supported in an ecosystem
Solar energy determines the autotroph population which determines the heterotroph populations
Uses the following terms:
Gross primary productivity (GPP)
Net primary productivity (NPP)

2. What is Productivity? Uses the following terms:
GPP-gross primary productivity
The amount of solar energy captured by plants
Involves photosynthesis activity which produces O2
↑ photosynthesis, ↑ biomass, ↑ food for others
Measured by rate of photosynthesis
Measure amount of CO2 used by plant OR measure amount of O2 produced by plant (aquatic)
Measured by increase in plant biomass
Massing plants (like taking the mass of your grass clippings after mowing the lawn)

3. What is Productivity? Uses the following terms:
NPP-Net Primary Productivity-
The difference between amount of stored energy and used energy
Stored energy: food (glucose) made through photosynthesis and not used by the plant (storage of biomass)
Used energy: food used in cellular respiration for biological work like growth and reproduction

4. Productivity

5. What is Productivity? Equation for NPP-
NPP=GPP-R (R stands for respiration)
NPP is higher than 0-accumulation of biomass
More energy is stored than used
Needing to mow your yard (biomass is accumulating)

6. What is Productivity? Factors affecting NPP- Availability of light
Filtered by vegetation, depth in ocean, clarity of water
Temperature and moisture
Nutrient availability (from the soil)
Tropospheric ozone (O3)-decreases productivity; ozone is taken in by plant and O2 is used to make O3

7. Measuring the PRODUCTIVITY- Light bottle/dark bottle method-
Used for an aquatic ecosystem
Fill bottle with algae rich water
Measure dissolved oxygen level at beginning
Cover half the bottles with foil to simulate darkness
Leave half the bottles uncovered
Leave overnight
Measure dissolved oxygen level after 24 hours