Principles of Ecology I

Question 1

Ecosystem Ecology encompasses

Answer 1

1. energy and nutrient flows
2. Primary production
3. Secondary production
4. Predators and parasites
5. Decomposers

Question 2

What is Gross Primary Production?

Answer 2

Total amount of CO2 fixed by all autotrophs in an ecosystem

Question 3

Net Primary Production

Answer 3

GPP - Respiration

Question 4

Bottom-Up Model of community organization

Answer 4

proposes a unidirectional influence from lower to higher trophic levels

Question 5

Top-Down Model of community organization

Answer 5

• also called the trophic cascade model, proposes that control comes from the trophic level above
• predation can impact abundance or behavior of lower trophic levels