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Biology Ch 20.2
Ch.20 vocab
Term | Definition |
---|---|
species richness | the number of different species in an area or community |
species evenness | the relative abundance of each species |
species-area effect | a pattern in which the number of species in an area increases as the area increases |
disturbance | are events that change communities, remove or destroy organisms from communities, or alter resource availability |
stability | is the tendency of a community to maintain relatively constant conditions |
ecological succession | a gradual process of change and replacement in a community |
primary succession | succession that begins in an area that previously did not support life |
secondary succession | the process by which one community replaces another community that has been partially or totally destroyed |
pioneer species | a species that colonizes an uninhabited area and that starts an ecological cycle in which many other species become established |
climax community | a final, stable community in equilibrium with the environment |