W09_L19_competitionII

W09_L19_competitionII

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Unformatted text preview: r-species limiting. other3. When and < 1 . THESE ARE NOT 3 different criteria, they are the saying the same thing using three different sets of words. dN1/dt = r1N1[(K1-N1 - a12N2)/K1] dN2/dt = r2N2[(K2-N2 - a21N1)/K2] http://fisher.forestry.uga.edu/popdyn/LotkaVolterraCompetition.html LIMITING SIMILARITY AND THE NICHE Performance No niche overlap, no interspecific competition, a = 0 Performance Complete niche overlap, strong interspecific competition, a = 1 First, lets (re)define the concept of a niche: moisture predation competition moisture disease Niche axis (e.g., prey size) competition prey size Low niche overlap, weak interspecific competition, a << 1 Performance High niche overlap, strong interspecific competition, a close to, but less than 1 Performance nutrients Fundamental niche: defined by physical conditions under which a species can persist Realized niche: alteration of fundamental niche by species interactions nutrients Performance Lo nutrients Hi Lo Realized niche: species actually occurs over a narrower range of nutrients due to competition from other species nutrients Hi Performance Not enough to grow Too much becomes toxic Performance prey size Complete niche overlap, a > 1 for effect of blue species on the red one prey size 3 Linking the ecology of competition to evolution Performance How might interspecific competition cause the evolution...
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This note was uploaded on 10/08/2009 for the course BIS 2 taught by Professor Schwartzandkeen during the Spring '09 term at UC Davis.

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