Campbell 51 - Chapter 51 BehavioralEcology Behavior

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    Chapter 51 Behavioral Ecology
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    Behavior What an animal does, and how it does it. Proximate causes What stimuli trigger the behavior Ultimate causes What is the evolutionary significance Case – Red crowned cranes behavior
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    Ethology Ethology – how animals behave Four questions at the core of ethology: What is the mechanistic basis of the behavior How does development affect the behavior What is the evolutionary history of the behavior How does the behavior affect the organisms fitness Notice which ones are ultimate and proximate  questions
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    Studies in Ethology Fixed action patterns: Sequence of  unlearned behaviors  that is unchangeable  and once initiated, is  carried to completion Triggered by sign  stimulus
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    Fixed Action Pattern
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    Imprinting Imprinting – type of behavior that  includes both learning and innate  components and is generally irreversible Sensitive period – limited phase in an  animals development that is the only time  when certain behaviors can be learned Example – young geese following their  mother
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    Behavior: Genes or Environment Behaviors are shaped by both genes and  environment Innate behavior – behavior that is  developmentally fixed Under strong genetic influence Examples of Innate behavior Directed movements
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    Directed Movements Kinesis – simple  change in activity or  turning rate in  response to a  stimulus Taxis – automatic or  oriented movement  toward or away from  a stimulus
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    Directed Movements Migration – is it genetic Blackcap migration experiment
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This note was uploaded on 01/27/2011 for the course BIO 301 taught by Professor Razi during the Spring '08 term at George Mason.

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Campbell 51 - Chapter 51 BehavioralEcology Behavior

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