BIO120H1 Chapter 17: Bio Chapter 17.doc
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BIO120H1 Full Course Notes
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Chapter 17 evolution of species interaction (346-458, c; 359-362, a; 363-366, c) Crypsis: the blending of an organism with its background by matching colour and pattern of bark, twigs or leaves; employed by palatable organisms (e. g. stick insect). Warning colouration/aposematism: the advertisement of unpalatability with bright, recognizable colours or patterns (e. g. monarch butterfly). Batesian mimicry: a palatable organism will mimic the colouration of an unpalatable one to confuse predators. Mullerian mimicry: several unpalatable organisms will resemble each other"s colouration to more efficiently teach predators to avoid them. With sufficient variety in resource, specialization can decrease competition and promote coexistence between two species. Although related species that live together differ in their utilization of resources, one cannot assume this is because of a prior history of interaction. Sympatric: the geographic ranges of two species overlap. Allopatric: the geographic ranges of two species do not overlap.