Biology 2483A Lecture Notes - Lecture 11: Character Displacement, Natural Selection, Competitive Exclusion Principle
13 Feb 2017
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Document Summary
Competition occurs between species that share use of a resource that limits the growth, survival, or reproduction of each species. Features of the environment required for growth, survival, or reproduction. Among plants should increase in nutrient-poor soils. Exploitation competition indirect competition: individuals reduce the availability of a resource as they use it. Interference competition: species compete directly for access to a resource (fight) Allelopathy: plants of one species release toxins that harm other species. Effects of competition often unequal, or asymmetrical, and one species is harmed more than the other. Example: when one species drives another to extinction. Amensalism - species harmed, individuals of other species not affected. Natural experiment is a situation in nature that is similar in effect to a controlled removal experiment. Ecological niches of competing species are very similar; the superior competitor may drive the other species to extinction. Competitive exclusion principle: two species that use limiting resources in the same way cannot coexist.
