Succession is a long-term change in the composition of communities. Unlike the action of seasons and natural disasters, succession is brought about by the activities of living organisms themselves who inhabit the environment. Over a period of time the environment is modified by these organisms so it becomes suitable for colonisation by another species and less suitable for those already there. These original species cannot compete with the new species better equipped to exploit the improved conditions so these organisms are 'out competed' and disappear.
…
