Chapter 46.8.docx

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9 Apr 2012
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Chapter 46.8 : Disturbance effects on community
Environmental disturbances eliminate some species and provide opportunities for others to become
established.
Frequent disturbances prevent some communities from reaching an equilibrium determined by
interspecific interactions.
- Intermediate disturbance hypothesis:
Species richness is greatest in communities experiencing fairly frequent disturbances of
moderate intensity. Moderate disturbances create openings for r-selected species to arrive and
join the community while allowing k-selected species to survive only.
- Serve disturbances contain only r-selected species while mild and rate disturbances contain k-
selected species.
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