Lecture23bio - BIOLOGY 1001 Monday Lecture 27 Chapter 40...

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BIOLOGY 1001 Monday, April 21, 2008 Lecture 27 Chapter 40 Community Interactions “Invasion of the Zebra Mussels” The U.S. spends 4 Billion dollars a year to get rid of Zebra Mussels. Factors Shaping Community Structure Climate and topography Available foods and resources Adaptive traits Species Interactions Overall pattern of population sizes Niche A description of the way a species utilizes its habitat. o Fundamental niche Theoretical niche occupied in the absence of any completing species. o Realized niche Niche as species actually occupies Fraction of the fundamental niche Competition Interspecific: Between species Intraspecific: Between members of the same species Intraspecific competition is most intense. Competitive Exclusion Principle When two species compete for identical resources, one will be more successful and will eventually eliminate the other.
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Resource Partitioning Have slightly different niches
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