is the gradual change in the types of species that live in a community. This can include primary and secondary situations.

The gradual change in the types of species that live in a community is known as "succession". This can occur in two main types: primary and secondary succession.

Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes.

Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. For example, after felling trees in a woodland, clearing of grassland after a fire, or harvesting a crop.

In both cases, the process of succession involves a series of changes in the species present in a community over time.