Key Concepts: Ecological Succession

What is Ecological Succession?

Ecological succession is the gradual change in species composition of a community over time.

• Primary Succession: Occurs in lifeless areas with no soil (e.g., bare rock, lava)
• Secondary Succession: Occurs in areas where a community was disturbed but soil remains (e.g., after a fire)

Stages of Succession

• Pioneer Species: First organisms to colonize (lichens, mosses)
• Intermediate Species: Grasses, shrubs, small trees
• Climax Community: Stable, mature community