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Primary succession. Definition. noun. An ecological succession that occurs following an opening of uninhabited, barren habitat or that occurs on an environment that is devoid of vegetation and usually lacking topsoil. Supplement.
In primary succession pioneer species like lichen, algae and fungi as well as other abiotic factors like wind and water start to normalize the habitat.Primary succession begins on rock formations, such as volcanoes or mountains, or in a place with no organisms or soil.This creates conditions nearer optimum for vascular plant growth; pedogenesis or the formation of soil is the most important process.n primary succession pioneer species like lichen, algae and fungi as well as other abiotic factors like wind and water start to normalize the habitat.