Lecture 17. Competition [Autosaved]

Lecture 17. Competition [Autosaved] - What is competition?...

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Unformatted text preview: What is competition? When individuals use a shared resource that is in short supply (not enough resource for all) Results in decreased rates of growth, survival or reproduction that alter population growth rates. Intraspecific competition Competition mpetition BETWEEN species works in much the same way, except that o species may have very different competitive abilities ne may grow faster, etc.) Competitive exclusion principle : two species that use the same resources in the same way cannot coexist. One will drive the other to extinction. (Gause) When species co-exist they must some how differ in the way they use resources these Parameciums partitioned the tubes vertically. Some apparently similar species co-exist how? Balanus upper limit Chthamalus upper limit Chthamalus zone Balanus zone Competition among barnacles on the Scottish coast Connell 1961 Chthamalus settlement Why doesnt Chthamalus live where Balanus lives? Chthamalus settlement Experiment: remove Balanus from areas of the lower intertidal and see what happens + Low Intertidal Chthamalus is fine when Balanus is excluded from lower tidal height Lower distribution limit set by interspecific competition o lower intertidal species competitively displace stress tolera ecies to high intertidal locations? Competition Intensity 1954 1955 Connell 1961 Why dont Balanus exclude Chthamalus from the higher intertidal too? QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Resource partitioning: a major way that competitors coexist echanisms of competition xploitative- resource depletion . What one individual uses, nother cannot. Individuals need not encounter one another o compete....
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This note was uploaded on 11/29/2010 for the course BIOLOGY 1211 taught by Professor Patricelli during the Spring '10 term at UC Davis.

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Lecture 17. Competition [Autosaved] - What is competition?...

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