Animal Behavior Chapter 51 Why does the caged bird sing? Big Idea #1: Evolution.

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Presentation transcript:

Animal Behavior Chapter 51 Why does the caged bird sing? Big Idea #1: Evolution

Animal Behavior Big Idea #1: Evolution an action carried out by muscles under control of the nervous system in response to a stimulus A blue orchard bee pollinates a zinnia.

Innate vs. Learned Behavior Sow with piglet Female orb weaver with prey innate behavior Hard-wired learned behavior Learned in response to a particular environmental context ?To what extent can behavior have evolved?

Three (3) Kinds of Innate Behavior 1. Taxes 2. Reflexes 3. Instincts Increasing Complexity

Kinds of Taxes Kinesis - random movement in response to stimuli Plants have similar responses (controlled by hormones instead of nerves): Tropisms What did you see in your lab?  Taxis - movement oriented towards or away from stimuli Table from Spark Notes - Biology Review

Instincts Complex behavior patterns Inborn rather inflexible valuable at adapting the animal to its environment The entire body participates in instinctive behavior, and an elaborate series of actions may be involved. May be inherited ----> genetically controlled! ADD examples, examples, examples from text, google,youtube???

Genetic Basis for Behaviors “Rovers” vs “Sitters” Controlled by a single gene for with two alleles (forms) R (dominant) = more enzyme, “rover” R (recessive) = less enzyme, “sitter” Experiment: If R-dominant enzyme is injected into r- recessive, the fly will forage

Fixed Action Pattern (Innate Behavior) In response to a sign stimulus organisms will initiate a fixed response which is unchangable and, once begun, must be carried to completion Agnostic display How did scientists determine the cause of the behavior? Why might this behavior have evolved.

How might bees find their nest? Cause of behavior isn’t always what you expect. What causes the wasp to locate his nest? How might this have evolved?

Learned Behavior Brain has the capacity to develop a behavior In response to a particular environmental context Why about learned behaviors might be inherited? Classical conditioning of dogs BioEd Online

Classical Conditioning - Pavlov’s Dogs

Operant Conditioning - B.F. Skinner

Behavior aligns with our physiology Circadian (daily) and Seasonal Rhythms “biological clock” = hypothalamus

Can learned behavior be inherited? NPR podcast: Science Studies Brain Process of Songbirds. Interview with Sarah Wooley, Columbia story.php?storyId= Why do songbirds learn vocalization? Do males and females both vocalize? Are bird songs similar within families? Why might this be important to a female bird? (Think: purpose of reproduction) What is the nature or nurture argument?

Animal Behavior Mockumentaries To help add examples to your notes, you will work with a partner to find a video and narrate one of the following behaviors: ImprintingOptimal foraging theory MigrationHibernation TerritoralityEstivation CourtshipParental investment Identify: 1) What the behavior is and how it is produced 2) Discuss why it may have evolved 3) Keep the narrated clip to 2 minutes !

Journal Club: Experiments in Animal Behavior How to read an abstract Focus: Cooperative behavior tends to increase the fitness of the individual and the survival of the population. Pack behavior (dominance hierarchy) Herd, flock, school behavior Altruism Insect social behavior (bees) What other Big Idea does this touch upon?