10 Behavioral Evolution

10 Behavioral Evolution - Behavioral Evolution 51.1, 51.2...

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51.1, 51.2 Behavioral Evolution What Is Behavior? • Behavior – What an animal does and how it does it – Includes muscular and nonmuscular activity Proximate and Ultimate Questions • Proximate , or “how,” questions about behavior – Focus on the environmental, genetic physiological and/or anatomical mechanisms that trigger a behavior •U l t im a t e , or “why,” questions about behavior – Address the evolutionary significance of a behavior Schooling in fish • How? Sense movement of other fish by sight (eyes of sides of head) and lateral line
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Innate, no modification through learning Originates and is modified by learning Highly stereotyped Fixed, little variation Highly flexible Condition dependent Yawning Smiling Language acquisition Fixed action pattern Fixed Action Patterns (FAPs) • Sequence of unlearned behaviors that are largely unchangeable • Usually carried to completion once initiated • Triggered by external stimuli • In male stickleback fish, the red underside of an intruder stimulates an attack Figure 51.3a (a) A male three-spined stickleback fish shows its red underside. Figure 51.3b (b) The realistic model at the top, without a red The realistic model at the top, without a red underside, produces no aggressive response in a male three -spined spined stickleback fish. The stickleback fish. The other models, with red undersides, produce strong other models, with red undersides, produce strong responses. • When presented with unrealistic models –A s l o n g a s s om e r e d i s p
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Innate, no modification through learning Originates and is modified by learning Highly stereotyped Fixed, little variation Highly flexible Condition dependent Yawning Fixed action pattern Sex change in clown fish Conditional strategy When dominant female dies her male mate changes sex and replaces her Innate, no modification through learning Originates and is modified by learning Highly stereotyped Fixed, little variation Highly flexible Condition dependent Imprinting Imprinting • Includes both learning and innate components • Generally irreversible • Develops only during critical period
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This note was uploaded on 02/23/2010 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.

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10 Behavioral Evolution - Behavioral Evolution 51.1, 51.2...

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