Chapter 46.7.docx

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Chapter 46: section 46.7
Population effects on community structure:
Competition:
- More than one species competing for a resource
- According to r-selected ecologists: Competition is not major force govering community
structure, pointing instead to predation or parasitism and physical disturbance
- According to K-selected ecologists: It has a profound effect on species distributions and
resource use.
Feeding:
- Predators can influence species richness and structure of communities by the
sizes of prey populations;
- Key stone species: Species with a greater effect on community structure than
their numbers might suggest