Secondary succession.

Question

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Answer

Secondary succession begins in areas where previously natural biotic communities were present. But later were destroyed due to causes such as abandoned farm lands, burnt or cut forests, flooded lands, etc.
Secondary succession is faster than primary succession because already there is some soil or sediment present.
It occurs in the form of changed vegetation. But due to changed vegetation, there is also change in the resident animals that depend for food and shelter.
Thus, with secondary succession, the numbers and types of animals and decomposers also change.
During succession, natural or human induced disturbances (fire, deforestation, etc.), can convert a particular serai stage of succession to an earlier previous / preceding stage.
Sometimes, disturbances like this can create new conditions that encourage some species and eliminate other species.

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