BIOLOGY 171 Lecture Notes - Lecture 18: Ecological Niche, Niche Differentiation, Character Displacement
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Vocabulary (you should be able to define and use all of these terms correctly. ) alpha-proteobacteria character displacement chloroplast competition competitive exclusion cyanobacteria endosymbiont fundamental niche land plants mitochondria. Competition is the species interaction in which both species have reduced fitness. Competition can occur between individuals of the same species (known as intraspecific competition) or between individuals of different species (known as interspecific competition). 47. 2, which provides a good overview of competition. Competition can lead to competitive exclusion or species coexistence, depending upon how much overlap there is in the resources used and how efficient each species is in obtaining resources. We will also contrast resource partitioning (also known as niche differentiation or niche partitioning) with character displacement, which are two distinct evolutionary outcomes of competitive interactions between two species. Look at figure 46. 19 for an example of how competition among anolis lizards has resulted in resource partitioning. These are the caribbean anolis lizards that we discussed back in unit 2.
