Answer:
Ecological succession is the process of gradual change of a community's ecological structure. It is further divided into primary succession and secondary succession.
Step-by-step explanation:
Primary succession: Following events occur during primary succession-
- A barren wasteland is occupied by a single species which is also known as the pioneer species.
- The pioneer species starts to reproduce and grow and soon invites other organisms to build a community.
- Examples of pioneer species are lichens, small plants and grasses.
- The climax community finally formed will contain trees like oak and banyan.
Secondary succession: Following events occur in secondary succession-
- Already existing habitat, which has been devastated by natural calamities or man made events, is re-established.
- Natural calamities include flood, rain or forest fires and man made include construction, etc.
- In this case, all life forms are not destroyed, as it is in the case of primary succession. Small herbs, grasses are available.
- Initially the pioneer species in this are insects and weeds.
- Also, secondary succession takes less time to reach climax community than primary succession.