€€1.018/7.30J fall 2009 Ecology of the Earth System Competition and the Niche READINGS Tues and Thurs LECTUREs: Competition Smith/Smith Chapter 14, 242-263 + Lauer&Spacie (zebra mussels) & Byers readings Predation Smith/Smith Chapter 15 all + Turchin paper on lemmings Today: Resource (exploitative) and interference competition Lotka-Volterra equations experimental evidence for competition the concept of niche field evidence of competition Density-dependent population regulation Allelopathy (a form of interference competition) In song sparrows, reproductive success declines with increasing population density – Fewer fledged young per female – Lower juvenile survivorship over the winter dN1 = r1N1(K1 − N1 −α12N2 )dt K1 1MIT OpenCourseWare http://ocw.mit.edu 1.018J / 7.30J Ecology I: The Earth Fall 2009 For information about citing these materials or our Terms of Use, visit:
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