This is the third secondary succession question I have answered tonight.
The answer is secondary succession which occurs after an event in an already or previous established community where changes take place on a previously colonized, but disturbed or damaged habitat.
Primary succession occurs in a community where changes occur on an entirely new habitat which has never been colonized before (where no substrate exists).
Examples of such habitats would include newly exposed or deposited surfaces, such as landslips, volcanic lava and debris, elevated sand banks and dunes, quarried rock faces.