1. Ecological Succession

2. Review: Food Chains and Webs

3. Review: What is an ecosystem?
Biological community (all different species) and all the non-living factors that affect it
REMEMBER: Ecosystems are always changing

4. Oak Tree Ecosystem

5. Ecological Succession
Definition: change in the ecosystem that happens when one ____________ replaces another as a result of changing __________ and __________ factors
Two Types: -
community
biotic abiotic
Primary Succession
Secondary Succession

6. Succession Occurs following a ____________ in the ecosystem
disturbance
Occurs following a ____________ in the ecosystem
Succession is the sequence of ___________ changes that regenerate a damaged community or a community in a previously _____________ area
biotic
uninhabited

7. Primary Succession
Establishment and development of an ______________ in an area that was previously uninhabited
Occurs very _______
First organisms that live in a previously uninhabited area are called ___________ _________
ecosystem
slowly
pioneer
species

8. Examples Bare rocks- Volcanic eruptions-
Rocks erode, sand accumulates, decomposition adds organic matter soil. As soil continues to form plants appear.
Following the eruption, there is NO life in the blast zone. Eventually, however, pioneer species do establish themselves.

9. Primary Succession
Process can be started by melting glaciers, volcanic eruptions, landslides

10. Secondary Succession
Reestablishment of a __________ ecosystem in an area where _______ was left intact
damaged
soil

11. Examples
Fire

12. Examples
Logging

13. Example
Ocean boat
scraps bottom

14. Summary What is ecological succession? What are the two types?
Describe the two types.