What is the difference between primary and secondary ecological succession?

Ecological succession refers to orderly changes in an ecological community. These changes may happen Because of the start of a new empty habitat (after a landslide, glacier, nuclear explosion, lava flow or even concreting), where all traces of previous biological material, even soil have been wiped out ( Primary ), or By some sort of disturbance (like bush fires, harvesting or logging) of an already existing habitat, which is not severe enough to kill everything. So plants can regrow and seeds spring up again ( Secondary ) Primary succession begins with the trees and secondary succession begins with lichens Primary succession begins in areas where no soil is present Secondary succession occurs in areas where there is soil already present.

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