Forest Cycles

Westside Time Machine

The passage of time brings a natural cycle of change to all forests.

As conditions in the forest change, existing plant and animal species give way and new ones establish themselves. This pattern of changing conditions and species over time is called succession.

This is one example of succession in a western hemlock forest west of the Cascade Mountains. Many variations on this pattern occur in Pacific Northwest forests.

Instructions: Travel backward or forward in time to see one example of forest succession: a cycle of change over time. Why do the shade-tolerant trees ultimately take over?

<- Back In Time -|- Forward In Time ->

Menu Bar