Lecture 21 Community ecologybb

Lecture 21 Community ecologybb - Community Ecology Is...

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Unformatted text preview: Community Ecology Is Community Composition Predictable or Random? Superorganisms (Clement, 1920’s) Predictable Climax Community Environmental gradient Abundance Superorganism: A Closed community species a-d species e-h Individualistic Concept of Ecology (Gleason, 1920’s) Chance Abundance Individualistic: Open communities sp a-h Environmental gradient Experiment Clementsian vs. Gleasonian Communities are a product of CHANCE E.g., Presence/Absence of a species W/ Otters W/O Otters How can we determine the number of species in a given area (or defined habitat) If you have x area (A), you can determine y no. of species (S) . . . S = cA z Bird Species on an Archipelago What percentage of bird species are lost from decreasing island size from 10,000 to 1000? • A. 70% • B. 75% • C. 50% • D. 22% • E. 29% Predicting Extinction Rates in Communities 10% habitat lost in 10 years =90% in 100 years? S = cA z Equilibrium Theory of Island Biogeography MacArthur & E.O. Wilson 1967 Habitat Islands & Species Diversity Why do some “islands” contain greater species diversity than others?others?...
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This note was uploaded on 10/22/2009 for the course BIO 124 taught by Professor Griscom during the Spring '07 term at James Madison University.

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Lecture 21 Community ecologybb - Community Ecology Is...

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