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Wikipedia: Ecological succession, a fundamental concept in ecology, refers to more or less predictable and orderly changes in the composition or structure of an ecological community. Succession may be initiated either by formation of new, unoccupied habitat (e.g., a lava flow or a severe landslide) or by some form of disturbance (e.g. fire, severe windthrow, logging) of an existing community.
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![A seral community of shrubs and grasses on an abandoned field [A seral community of shrubs and grasses on an abandoned field]](http://images.ookaboo.com/photo/s/Secondary_succesion_cm01_s.jpg)
![Succession after disturbance: a boreal forest one and two years after a wildfire [Succession after disturbance: a boreal forest one and two years after a wildfire]](http://images.ookaboo.com/photo/s/Boreal_pine_forest_after_fire_s.jpg)
![A hydrosere community. [A hydrosere community.]](http://images.ookaboo.com/photo/s/Schleienloecher2_1_C_s.jpg)