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Index >> Fundamentals of Microbial Ecology >> Pre-Emptive Colonisation

Pre-Emptive Colonisation

Pre-emptive Colonisation
When pioneer organisms alter the condition in the habitat in ways that discourage further succession, it is called pre-emptive colonisation which may extend the rule of the pioneer organism, but populations better adapted to the newly colonised habitat (altered habitat) usually replace the pioneers. Gradually secondary invaders are also replaced. Succession ends when a relatively stable community called a climax community is achieved.

Climax community represents as table community where no further changes may take place within the biological community. It is difficult to apply the concept of climax community to the microbial community. According to the classical ecological thinking, a climax community represents a state of equilibrium and it rarely occurs due to disturbances which randomly affect the successional processes preventing the community from ever reaching full equilibrium.

 

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