Lecture30_Competition

Lecture30_Competition - Competition I. Competition theory...

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Competition I. Competition theory A. Fundamental vs. realized niches A species' niche is the sum of all resources it uses and all habitats it occupies • Fundamental niche: range of possible resources and habitats used • Realized niche: actual range of resources and habitats used B. Niche differentiation and resource partitioning Species A Species B % used Resource (e.g. water temp) ask: what will happen over time? Hypothesis: if competition occurs, natural selection will favor individuals that … therefore niches occupied by different species will Species A Species B % used Resource (e.g. water temp) Niches have differentiated; species are
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Symmetric competition = interacting species affect each other equally in competition. Asymmetric competition = one species is a stronger competitor than the other. Fitness Sp.A A+B Sp.B D. Competitive exclusion (complete niche overlap) Competition experiment by Gause: Pop’n density Pop’n density Time II. Observational studies of competition
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Lecture30_Competition - Competition I. Competition theory...

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