Chapter 2 Section 2 succession

Succession Gradual development of a community over time Two types: ◦ Primary ◦ Secondary

Primary Succession Growth in a place where no other growth has occurred before Generally no soil Begins on bare rock

Stages of Primary Succession Lichens are usually first. These are pioneer species Acid from lichens break down rock into soil Mosses grow replacing lichens Ferns grow replacing mosses Grasses grow replacing ferns Wildflowers, small trees, and shrubs begin to grow Soil gets deep enough to support forests

Lichens Moss Ferns Wildflowers and grasses Softwoods Hardwoods

Secondary Succession Takes place after an existing community is destroyed or abandoned and the soil is still intact Crabgrass grows first New weedy plants like horseweed grows Small bushes and trees grow – softwoods ex. pine Hardwoods (ex. Oak) replace softwoods

Crabgrass Horseweed Softwoods and shrubs Hardwoods

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