Ecological succession is the process of how species compositions change in an ecological community over time.[1]
The two main categories of ecological succession are primary succession and secondary succession. Primary succession occurs after the initial colonization of a newly created habitat with no living organisms. Secondary succession occurs after a disturbance such as fire, habitat destruction, or a natural disaster destroys a pre-existing community.[2]
Both consistent patterns and variability are observed in ecological succession. Theories of ecological succession identify different factors that help explain why plant communities change the way they do.[3]
Succession was among the first theories advanced in ecology.[4] Ecological succession was first documented in the Indiana Dunes of Northwest Indiana by Henry Chandler Cowles during the late 19th century and remains a main ecological topic of study.[5] Over time, the understanding of succession has changed to include a more complex cyclical model that argues organisms do not have fixed roles or relationships.[6] Ecologists and conservationists have since used the theory of succession to aid in developing ecological restoration strategies.[7]