Lecture 23

Lecture 23 - Bio 121 Lecture 23 coevolution A. Predation...

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Bio 121 Lecture 23 – coevolution A. Predation – when one organism eats the other (mutual selection pressures) a. Evolutionary arms race between prey and predators a.i. Red queen hypothesis b. Predator adaptations b.i. Fangs b.ii. Stangers b.iii. Claws b.iv. Increased prey detection b.v. Behavioral abilities c. Prey avoidance adaptations c.i. Poison c.ii. Aposematic colorations c.iii. Mimicry c.iii.1. Batesian c.iii.1.a. King snakes mimic red, yellow, and black of coral snakes c.iii.1.b. Mimic a distasteful or dangerous species c.iii.2. Mullerian c.iii.2.a. Both species are distasteful and mimic eachother (mutualism) c.iii.2.b. Viceroy butterfly and monarchs c.iv. Cryptic coloration (camouflage) c.v. Escape in time (be unpredictable) c.v.1. 17 year cicadas c.vi. Escape in numbers c.vii. Escape in space (dispersal mechanisms) c.viii. Escape in size c.ix. Early detection B. Outcomes of predation – may produce sicklic changes in predators and change a. Predator population typically fluctuates less
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Lecture 23 - Bio 121 Lecture 23 coevolution A. Predation...

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