Lecture 27

Lecture 27 - Bio 121 Lecture 27 behavioral ecology A....

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Bio 121 Lecture 27 – behavioral ecology A. Ethology – study of the mechanisms of behavior a. Behavior ecology – study the evolution of behavior b. When analyzing behavior (other than humans) biologists assume the animals behavior is not conscious decisions B. Cost/benefit – behavior evolves by natural selection if the benefits < costs a. Cost a.i. Energetic loss a.ii. Risk of predation b. Benefits b.i. Increasing survival b.ii. Increasing reproductive fitness c. Trade-offs – compromised solution through natural selection d. Example d.i. Egg shell removal in black headed gulls d.i.1. Advantage for parents to remove the egg shells and take them away from the nest because egg shells attract predators d.i.2. Great the distance between chick and eggshell, the lower probability of predation. d.i.3. Cost – if the parents take the egg shells, they have to leave the nest for some time and the neighbors can eat the kids when gone. d.i.4. Natural selection evolved compromise and tradeoff – parents wait about 1 hour before removing the egg shells – chicks dry and become fluffy. C. Stimulus-response – only a portion of the stimulus is used by responding individual a. Sign stimuli – portion of the stimulus that leads to response (fixed action pattern)
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Lecture 27 - Bio 121 Lecture 27 behavioral ecology A....

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