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Principle of Competitive Exclusion or Gause’s Principle
No two species can coexist and share the same spaceif they compete for the same resources within that space
Coexistence possible only if resource needs do not overlapor only slightly overlap
Niche
All ecological parameters under which a species lives and grows
--abiotic and biotic resources
No two species can share the same niche
Resource partitioning
Character displacement
When related species coexist by exhibiting differencesin morphology of one or more characters that reducesniche overlap
e.g., beak size and seed size in birds
A morphological character is part of the phenotype of a species, often (but not always) determined by genotype
Adaptive Radiation
Figure B, p. 283
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