L39 The trophic structure of ecosystems UF

Question 1

All organisms need energy, where might they get it

Answer 1

The sun or chemicals

Question 2

What is Gross primary production (GPP)

Answer 2

Total amount of energy generated by autotrophs in an ecosystem

Question 3

What is Net primary productivity (NPP)

Answer 3

GPP-respiration by autotrophs

Question 4

Does NPP vary dramatically across Earth

Answer 4

yes

Question 5

Where is NPP greatest

Answer 5

In equatorial regions, with high rainfall

Question 6

What is NPP constrained by

Answer 6

Energy (e.g. temperature or light ( for aquatic ecosystems))
Water (for terrestrial ecosystems)
Limiting Nutrients (nitrogen and phosphorus

Question 7

What are the trophic levels and food chain

Answer 7

Plants (primary producers) ->
Herbivores (primary consumers)->
Carvivores (secondary consumers)->
Top carnivores (tertiary consumers)

Question 8

What is lost at each step of the food chain

Answer 8

Energy

Question 9

What does the loss of energy at each stage of food chain limit

Answer 9

Number of links in the chain