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Transcript of Lesson 23
Primary and Secondary Succession
Ecological succession is a series of more-or-less predictable changes that occur in a community over time.
Ecosystems change over time, especially after disturbances, as some species die out and new species move in.
Succession that begins in an area with no remnants of an older community is called primary succession
Volcanic Erruptions and Glaciers
The first species to colonize barren areas are called pioneer species.
One ecological pioneer that grows on bare rock is lichen—a mutualistic symbiosis between a fungus and an alga.
Sometimes, existing communities are not completely destroyed by disturbances. In these situations, secondary succession occurs.
Secondary succession proceeds faster than primary succession
Secondary succession often follows a wildfire, hurricane, or other natural disturbance.