2%20Nov%20%20Navigation_Predation

2%20Nov%20%20Navigation_Predation - 2nd Mechanism: feature...

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144: Migration, Predation 2 Nov 09 1 “North” = star that doesn’t move Steve Emlen Indigo buntings • Planetarium • North Star –Learn –Fly away from =Compass • Learn surrounding =Map Genetic encoding of Zugunruhe (migratory restlessness) duration Arti±cial selection for later departure date
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144: Migration, Predation 2 Nov 09 2 • Predator cognition –Learning to ‘see’ • Prey cognition –Strategies Learning to see the prey • Visual arms race –Crypticity Polluted air selects for melanistic form of moth ( Biston betularia) Moths choose resting background
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144: Migration, Predation 2 Nov 09 3 Figure 6.20 Does cryptic behavior work? Blue jays -- show lag and priming effects hunting for moths “Yes” is correct “No” is correct
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Unformatted text preview: 2nd Mechanism: feature integration Feature: color, shape, texture, etc Differ by one : easily seen Differ by more than one feature, harder and harder to see More features = Slower Differs by 1 feature Differs by Shape AND color X shape Black color X or O shape Black or white color 144: Migration, Predation 2 Nov 09 4 Search image and feature integration Pigeons Touch screen Mottled background Virtual Beans and Wheat Peck on object for reward Runs or Mixed Bean probe Important changes - bird slows down. Change feature - slow reaction Shape only Color only Shape+color Mixed run Bean run Wheat run Bean test Morph test...
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2%20Nov%20%20Navigation_Predation - 2nd Mechanism: feature...

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