7compete - BIO 20 COMP 1 COMPETITION MUTUALISM 1 SYMBIOSES symbiosis any relationship between 2 species beneficial harmful 0 no effect neutralism

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BIO 20 COMP 1 1. SYMBIOSES symbiosis - any relationship between 2 species + beneficial, – harmful, 0 no effect neutralism 0 0 competition predation + mutualism + + commensalism + 0 ( amensalism ) 0 2. COMPETITION interspecific competition - between 2 diff spp. - limited resources (food, water, space) - major force behind speciation exploitation - no direct interaction - deplete resource so not available interference - direct behavior or chem interaction - incl. allelopathy in plants dN dt = r N ( K – N – α N 2 K ) N 2 - population size of other species α - inhibitory effect - degree carrying capacity is lowered 3. COMPETITIVE EXCLUSION PRINCIPLE Gause - 2 competing spp. cannot coexist - evolve diff species to avoid compete - adapt diff resource, emigrate, extinct resource partitioning - evolutionary strategy to avoid comp. - divide resources in ecosystem - diff prey/size, time, microhabitat, etc.
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BIO 20 COMP 2 niche - specific role in ecosystem esp. food
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This note was uploaded on 08/12/2010 for the course BIO 20 taught by Professor Hom during the Spring '08 term at City College of San Francisco.

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7compete - BIO 20 COMP 1 COMPETITION MUTUALISM 1 SYMBIOSES symbiosis any relationship between 2 species beneficial harmful 0 no effect neutralism

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