Ecological Succession
Venn Diagram
Top Flap
Primary Succession
• Take more time
• Begins on newly
exposed surfaces
• Lava flow and
glaciers
Both
• Can occur on
Secondary
Succession
• Take less time
ocean floor or on
• Soil is present
continents
• Forest fires and
• Both are types
floods
of succession
and slow
changes
• Ecosystems grow
and become
more complex
Underneath the Flap
Bare rock
Pioneer species
Grasses appear
Small shrubs
appear
• Young forest
grows
• Mature forest
•
•
•
•
• Forest fire or
other
disturbance
• Soil present
• Grasses appear
• Small shrubs
appear
• Young forest
appears
• Mature forest