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Succession Chapter 14 – Notesheet III Section 14-5 – Ecological Succession Succession Ecosystems are constantly changing in response to natural and human disturbances. Succession Ecosystems are constantly changing in response to natural and human disturbances. As an ecosystem changes, older inhabitants gradually die out Succession Ecosystems are constantly changing in response to natural and human disturbances. As an ecosystem changes, older inhabitants gradually die out and new organisms move in, Succession Ecosystems are constantly changing in response to natural and human disturbances. As an ecosystem changes, older inhabitants gradually die out and new organisms move in, causing further changes in the community. Succession Ecological succession - Succession Ecological succession – sequence of predictable biotic changes that regenerate a damaged community or create a community in a previously uninhabited area Succession Primary succession - Succession Primary succession – on land, succession that occurs where Succession Primary succession – on land, succession that occurs where no soil exists. Succession Primary succession – on land, succession that occurs where no soil exists. examples- Succession Primary succession – on land, succession that occurs where no soil exists. examples- volcanic eruptions create new land with lava or ash - exposed bare rock as glaciers melt Succession Primary succession – Pioneer species - Succession Primary succession – Pioneer species – first species to populate area of primary succession Succession Primary succession – Pioneer species – first species to populate area of primary succession • Often lichens • As grow they help break up rocks Succession Primary succession – Pioneer species – first species to populate area of primary succession • Often lichens • As grow they help break up rocks • When die they add organic material to help for soil for plants to grow Succession Primary succession – Succession Secondary succession – Succession Secondary succession – when disturbance of some kind changes an existing community without removing the soil Succession Secondary succession – when disturbance of some kind changes an existing community without removing the soil Examples - Succession Secondary succession – when disturbance of some kind changes an existing community without removing the soil Examples – • land is cleared for farming and abandoned Succession Secondary succession – when disturbance of some kind changes an existing community without removing the soil Examples – • land is cleared for farming and abandoned • wildfire burns woodlands Succession Secondary succession – Occurs faster than primary succession because Succession Secondary succession – Occurs faster than primary succession because soil is already present Succession Secondary succession –