Unformatted text preview: ttom-up control
How do we quantify the strength of trophic interactions? Top-down
mice Lyme disease
infected ticks eat Deer Gypsy
moths are eaten
control Leaves Acorns (Red oak) COMMUNITIES AND ECOSYSTEMS
1. What is a community and how do we quantify
2. How do communities change over time?
3. Food chains and top-down vs. bottom-up
4. What stabilizes communities?
5. What is an ecosystem?
6. How do we measure energy flow through an
7. How do we measure energy flow through an
10 5 What stabilizes communities? How does a community
respond to disturbance? 11 What stabilizes communities?
-Resistance Text -Return time
(amount of time taken for a population -Resilience to “bounce back” after a disturbance) -Persistence (ability for population to remain stable
despite there is a disturbance) -Constancy (amount of change a population
undergoes over time) persistence = resistance to change
6 What stabilizes communities?
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- Fall '12
- Ecology, trophic level, food chains, -Bob Paine, strong top-down interactions