Lecture 39 - BioNB 221, Lecture 39: Predator Avoidance,...

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Unformatted text preview: BioNB 221, Lecture 39: Predator Avoidance, Mimicry & Crypsis 1 December 2008 Robert Raguso, Dept. of NBB Cornell University Predator Avoidance Strategies • Reducing Detection • If Detected, Reducing Attack • If Attacked, Reducing Capture • If Captured, Reducing Consumption Familiar Themes: Contingency & Scale Signal-to-Noise Ratios Signal Evolution Predator Learning Game Theory Reducing Detection • Misdirection – Mobbing – Bluff • Crypsis – Camouflage, decreased signal:noise – Inanimate objects as models S.C. Bisserot—Bruce Coleman Ltd. 6.16 The peppered moth, Biston betularia Polluted! Non-Polluted 6.17 Predation risk and background selection by moths Black on white background White on black background High Contrast = high predation! www.answers.com/topic/polymorphism Reducing Attack • Honest Deterrence (armor, weaponry) • Mimicry – Aposematism, increased signal:noise Learned Avoidance of “monarch” Color Pattern by Naïve Blue Jays Operator Mimic Model Mimicry Requires Reinforcement: Abundance of the Model...
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This note was uploaded on 04/07/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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Lecture 39 - BioNB 221, Lecture 39: Predator Avoidance,...

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