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Chapter 20

Vocabulary

TermDefinition
predation an interaction between two species in which one species, the predator, feeds on the other species, the prey
interspecific competition a relationship between two species in which both species compete for limited resources such that both species are negatively affected by the relationship
symbiosis a relationship in which two different organisms live in close association with each other
parasitism a relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed
mutualism a relationship between two species in which both species benefit
commensalism a relationship between two organisms in which one organism benefits and the other is unaffected
species richness the number of different species in an area or community
species evenness a measure of the relative adundance of each species in an ecological community
species - area effect a pattern in which the number of species in an area increases as the area increases
disturbance in ecology, an event that changes a community by removing or destroying organisms or altering resource availability
stability the tendency of a community to maintain a relatively constant structure
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
Created by: FarlowA20