1. Aim # 74: How do ecosystems change over time?
Date: May 8th, 2017
Aim # 74: How do ecosystems change over time?
HW:
Daily Review of class notes
Test Corrections due TUESDAY
Test Wednesday 5/10 (period 5), and Thursday 5/11 (period 1)
RRB pages 5-8 due Friday
Castle Learning (QUIZ #2) due next MONDAY
Do Now: Briefly describe the:
-Carbon/Oxygen Cycle
-Water Cycle
- Nitrogen Cycle

2. Aim #74: How do ecosystems change over time?

3. 1) Ecological Succession
The process by which an ecosystem changes over time – often from a barren piece of land to a complex ecological community.. 2 5 4 1 3

4. 2) Ecological Succession In a Forest
As time passes grasses grow & then get replaced by shrubs and eventually a forest will form.
Why do the grasses disappear?
The large shrubs and trees prevent light from reaching the grasses.

5. 3) Ecological Succession in Ponds & Lakes?
As time progresses, the pond gets filled in with dead organic matter. The dead organic matter takes the place of the water in the pond or lake.
Eventually a forest form where the pond once was.

6. 4) What is the final state of ecological succession
A climax community with great
biodiversity

8. Destruction of Climax Communities
Fires, volcanic eruptions, tsunamis, deforestation, acid rain
Their destruction often (but not always) means the birth of a NEW community via succession.

10. Let’s Review! What is the definition of ecological succession?
In ecological succession of a forest, the grasses eventually disappear. Why does that happen?
How does a pond eventually give rise to a forest?
What is the final stage of ecological succession?
If a forest fire burns all of the trees and life in given area, does this mean the forest is doomed forever? Explain