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Unformatted text preview: 11/19/2009 1 Coexistence of species ? - competitive exclusion principle MIAMI - The alligator has some foreign competition at the top of the Everglades food chain. . A 13-foot Burmese python recently burst after it apparently tried to swallow a live, six- foot alligator whole, authorities said. Why can’t we all just get along? Fact of the day Carrying capacity Logistic growth – Testing assumptions – Early laboratory cultures (Pearl 1927) Competition and coexistence 11/19/2009 2 Competition (-/-) Multiple organisms or species trying to maximize their own use of a pool of resources that are often (but not always) limited. Niche Ecological niche: total of species abiotic and biotic resource use. Niches: fundamental and realized fundamental fundamental niche niche realized niche realized niche realized niche realized niche – often smaller due to biotic often smaller due to biotic limitations limitations fundamental niche fundamental niche – defined by an organism’s defined by an organism’s abilites to live in a given abilites to live in a given abiotic environment abiotic environment Niche • Fundamental vs. Realized • n-dimensional hypervolume Environmental variables important to Loblolly pine 11/19/2009...
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- Spring '10
- Genetics, Miami, Ecological niche, Competitive exclusion principle, everglades, A. lagnanensis