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Intermediate Disturbance Hypothesis

Definition

The Intermediate Disturbance Hypothesis suggests that moderate levels of disturbance in an ecosystem promote higher biodiversity compared to low or high levels of disturbance. According to this hypothesis, periodic disturbances create opportunities for new species colonization while preventing competitive exclusion by dominant species.

Analogy

Imagine a garden where weeds grow unchecked without any disturbance. On the other hand, if you constantly plow over everything in your garden, nothing will be able to establish itself either. However, if you occasionally remove some weeds but allow others to grow naturally, you'll end up with a diverse mix of plants thriving together.

Related terms

Succession: Succession refers to the gradual change in plant and animal communities over time in response to environmental conditions. It can be primary (starting from bare rock or soil) or secondary (following a disturbance).

Pioneer Species: Pioneer species are the first organisms to colonize an area during primary succession. They are typically hardy and can tolerate harsh conditions, paving the way for other species to establish themselves.

Climax Community: A climax community is the stable, mature community that eventually develops after succession has occurred. It represents a relatively balanced state where species composition remains relatively constant unless disturbed.