Succession in Ecosystems. Succession- a series of changes in a community in which new populations of organisms gradually replace existing ones.

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Presentation transcript:

Succession in Ecosystems

Succession- a series of changes in a community in which new populations of organisms gradually replace existing ones

Primary succession- colonization of new sites by communities of organisms – takes place on bare rock

Primary succession- New bare rock comes from 2 sources: 1. volcanic lava flow cools and forms rock

Primary succession- New bare rock comes from 2 sources: 2. Glaciers retreat and expose rock

Pioneer organisms- the first organisms to colonize a new site Ex: lichens are the first to colonize lava rocks

Primary Succession- Rock

Climax community- a stable, mature community that undergoes little or no succession

Climax community- Ex: In North Alabama, the climax community would be an Eastern deciduous Forest

Eastern Deciduous Forest in U.S.

Climax community- Ex: In South Alabama, the climax community would be a Southeastern Mixed Forest.

Southeastern Mixed & Outer Coastal Plain Forest

Primary succession-

Secondary succession- sequence of community changes that takes place when a community is disrupted by natural disaster or human actions – takes place on existing soil

Secondary succession- Ex: A fire levels portions of a forest

Secondary succession- Ex: A farmer plows his field

Secondary succession-

Pond Succession