Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

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.

Ask a homework question - tutors are online