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jan 30 handout - Review Session Here 6PM Competition Any...

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1/29/2012 1 Review Session • Here • 6PM Competition Any use or defense of a resource by one individual that reduces the availability of that resource to other individuals
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1/29/2012 2 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 Intra- and Interspecific Competition 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 If two species are present, both occur simultaneously 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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