jan 30 handout - 1/29/2012 Review Session Here 6PM...

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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 •P rey •Hos ts • 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
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1/29/2012 3 Gause’s Experiment 1936
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jan 30 handout - 1/29/2012 Review Session Here 6PM...

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