lecture 9 2010 - Competition Any use or defense of a...

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Competition
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Any use or defense of a resource by one individual that reduces the availability of that resource to other individuals
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Conditions that lead to competition Competitors have the same needs with regard to some resource (same niche) Resource is limiting Potential resources Mates Prey Hosts Oviposition sites
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Intra- and Interspecific Competition If two species are present, both occur simultaneously For two species to co-exist, INTRASPECIFIC competition must be stronger than INTERSPECIFIC competition. Stronger intraspecific competition favored by: Resource partitioning Dispersal of weaker species to lower quality resources Aggregated resource use
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Competitive Exclusion Principle (Gause’s principle) – Two species can not completely occupy the same niche indefinitely One species will win and the other perish
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Laboratory populations of both P. aurelia and P. caudatum
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lecture 9 2010 - Competition Any use or defense of a...

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