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4.3 Ecological Succession Key Term Ecological succession – a series of predictable change in a community over time. 4.3 Ecological Succession Succession occurs following a disturbance in an ecosystem. • Succession regenerates or creates a community after a disturbance. – a sequence of biotic changes – damaged communities are regenerated – new communities arise in previously uninhabited areas 4.3 Ecological Succession • There are two types of succession. – Primary Succession — When a community arises in a lifeless area that has no soil. Started by pioneer species. – Pioneer Species - first to colonize previously disrupted or damaged ecosystems, starts ecological succession – Example - New islands (created by volcanoes) 4.3 Ecological Succession • There are two types of succession. – Secondary Succession — started by remaining species; When a disturbance damages an existing community but leaves the soil intact – Forested area cleared for farming and then abandoned