Biol 201 - Notes - 3.30.2009

Biol 201 - Notes - 3.30.2009 - Types of Interactions...

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Types of Interactions - Competition - Amensalism - Predation, parasitism - Commensalism - Mutualism Competition - Competing for  resources o Foods o Open space for sessile organisms o Hiding places and other safe sites o Anything consumed that increases population growth - Conditions  are not resources o for example, temperature affects growth and reproduction, but it is not  consumes Modes of Competition - Exploitation  (scramble, diffuse)  Competition o When individuals compete indirectly by depleting shared resources Example: when concert tickets become available and everyone tries to get  them - Interference  (contest, direct)  Competition o When individuals also decrease ability of others to access a resource - Intraspecific o Competition within members of one species o Self thinning rule for trees: at lower weight, the density of tree growth is much  higher. As the trees grow, fewer get bigger, and more die.
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This note was uploaded on 09/24/2009 for the course BIOL 201 taught by Professor Mitchell during the Spring '07 term at UNC.

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Biol 201 - Notes - 3.30.2009 - Types of Interactions...

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