1. Ecological Succession
Spring 2018

2. Mt. St. Helens

3. Community- made up of populations of organisms that live in a common area.
Examples:
all of the organisms living on a dead tree
Life within a pond
Community

4. Ecological Succession
Limiting Factor- anything that limits an organism’s ability to live in a particular environment.
Example: a lack of water causes grass to die, causing certain heard population to decrease.
Energy supply, competition, disease, predation
Tolerance- the ability of living things to survive the changes in their environment.

5. Ecological Succession (4.3 pg 106)
Succession- the process of gradual, natural change and species replacement
Takes place in the communities of an ecosystem over time.

6. Step 1: Primary Succession
Takes place on land where there are no living organisms
Example: After a volcano erupts
Pioneer species- the first species to populate the area
Pioneer species eventually die, adding organic material to help form soil for plants

9. Step 2: Secondary Succession
Pattern of changes that takes place after an exiting community is destroyed.
Examples: fires set by lightning, farming, and floods
May take shorter time to reach a climax community since soil already exists.

11. top-left, 1989; top-right, 2003; bottom-left, 2009; bottom-right, 2010

12. Climax Community
a stable community formed after primary or secondary succession once little or no change occurs.