The process of primary autotrophic succession is completed through the following steps:
This refers to the development of bare area without any form of life. The causes of nucleation are of the following three types:
The existing community may disappear due to soil erosion by gravity, water or mud.
Dry period, hails and storms, fire, frost etc. may also destroy the community, (ill) Biotic: The most important biotic factor such as man is responsible for the destruction of forests, grasslands for industry, agriculture and housing etc.
This is the successful establishment of a species in a bare area. The species reaches the new site from any other sea. The process is completed in three successive stages.
The seeds, spores of the species reach by water, air etc. This process is called as migration.
(ii) Establishment (Ecesis):
After reaching the new area, the process of establishment of the species as a result of adjustment takes place. This is known as Ecesis.