8.5 Community Ecology
Notes
Interactions between species shape communities:
- Competition (−/−), predation and herbivory (+/−), parasitism (+/−), mutualism (+/+), commensalism (+/0).
- Keystone species have large effects relative to their numbers.
- Species diversity uses richness and evenness (e.g., Simpson's index).
Practice
Bees and flowers benefit each other. This is:
+/+.
A tick feeding on a deer is:
+/−.
Removing sea otters lets urchins destroy kelp forests. Sea otters are a:
Big impact on the community.
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