1What is ecosystem productivity?
The rate at which biomass is produced, usually measured per unit area per unit time
2NPP = GPP - producer respiration losses
How is net primary productivity calculated from gross primary productivity?
3A producer has a gross primary productivity of 500 units and respiration losses of 200 units. What is its net primary productivity?
300
4What does a pyramid of numbers show?
The number of individual organisms at each trophic level
5What does a pyramid of biomass show?
The total dry mass of organisms at each trophic level at a particular time
6Why are samples dried before their biomass is measured?
To remove water so that differences in water content do not affect the measurement
7What is the difference between bioaccumulation and biomagnification?
Bioaccumulation is pollutant build-up in an individual over time; biomagnification is increasing pollutant concentration at higher trophic levels
8What are microplastics?
Plastic particles smaller than 5 mm