1. Succession: Changes Over Time
•Succession–process of gradual, natural change and species replacement that takes place in the communities of an ecosystem over time
•Two types –primary& secondary

2. What is Primary Succession?
•Primary Succession–takes place on land where there are no living organisms *Example- –When a volcano erupts, lava covers the entire land, killing all organisms. This type of natural event covers even the soil so there is NO LIFE AT ALL!!!

3. Primary Succession

4. What is Secondary Succession?
•Secondary Succession–changes that take place after an existing community is destroyed. (the land still has soil though!!!)
•Example -a forest fire kills the plants but soil still exists.

5. Secondary Succession

6. What’s the difference between the two
What’s the difference between the two? Organisms show up much quicker during secondary succession then primary succession.

7. Pioneer Species 1st species to show up
Pioneer species are usually lichens, which are algae growing together with fungi.
Named because they are the first to show up, like the “Pioneers” of a new place

8. Steps in Succession
•1st –Land is destroyed
•2nd Presence of Pioneer Species.
•3rd –Slowly plant life appears. It takes less time for wild flowers and shrubs to appear than trees. Pine trees grow to maturity faster than hardwoods such as maple and oak.
•4th –Animals that rely on plants slowly move in.
•5th –Climax Community is established.

9. Climax Community
This is a stable community with a diverse number of organisms.