BIOL202 - Study Guide - Lecture 9 - Community Composition

BIOL202 - Study Guide - Lecture 9 - Community Composition -...

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LECTURE 9: STUDY GUIDE Community Composition: What Determines What Species are Found in a Community? “In any fairly limited area, only a fraction of the forms that could theoretically do so actually form a community at any one time…The…community is really an organized community in that it apparently has limited membership .” The great American ecologist, Charles Elton, 1933 “If two or more nearly related species live in the field in a stable association, these species certainly possess different ecological niches.” The great Russian ecologist, G.F. Gause, 1939 Reading: Red/Black Campbell 7 th ed pgs 1160-1161, 1171-1173 Black/Green Campbell 6 th ed pgs 1176-1177, 1186-1188 Terminology: Competitive Exclusion Principle (from an earlier lecture) resource partitioning ecological disturbance spate (e.g., in a small stream) Questions, etc. 1. a) Why was it said in lecture that “biological communities sometimes appear to be like exclusive country clubs or fraternity/sororities?” b) What is the "central question of interest” to scientists that study biological communities? 2. List all the types of (direct) biotic interactions that could POTENTIALLY influence whether a species can establish itself at a particular location, in a particular community.
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