1. Ecological Succession
Change in an ecosystem that occurs when one community replaces another as a result of changing abiotic and biotic factors.

2. 2 Types of Succession
Primary Succession
Secondary Succession

3. Primary Succession
Establishment of a community in an area where one did not exist before.
Occurs on solidified lava flow, exposed rocks, or a cliff where NO soil is present.
Pioneer species like lichens (combination of fungus and algea) break down the rocks by secreting acids. This forms the soil.
As species die, other organisms invade.

4. Small weedy plants, ferns, fungi, and insects invade.
Once they die additional soil is created.
Seeds brought in by wind, water and animals begin to grow.
Eventually enough soil is present for shrubs and trees to grow.

6. Secondary Succession
Change that takes place after a community of organism has been removed, but soil remains intact.
Causes of secondary succession: fire, flood, windstorms, and field clearing.
Mainly plants are the first to grow in a distrubed area, followed by other species.
Occurs faster than primary succession, but still a very slow process.

8. Draw, Color, and Label On the top of your page:
Figure 3.3 pg 62-63
On the bottom of your page:
Figure 3.4 pg 64