Behavioral responses to stimuli may be adaptive



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27 Animal Behavior PPT

  • KEY CONCEPT Behavior lets organisms respond rapidly and adaptively to their environment.

Behavioral responses to stimuli may be adaptive.

  • Detecting and responding to stimuli is key to an individual’s survival.
  • Internal stimuli tell an animal what is occurring in its own body.
    • hunger
    • thirst
    • pain
  • External stimuli give an animal information about its surroundings.
    • sound
  • Specialized cells that are sensitive to stimuli detect sensory information.
  • Animal behaviors help to maintain homeostasis.
  • Kinesis and taxis are two types of movement-related behaviors.
    • Kinesis is an increase in random movement.
  • Taxis is movement in a particular direction.

Internal and external stimuli usually interact to trigger specific behaviors.

  • Most behaviors are a response to both internal and external stimuli.
  • External stimuli may trigger internal stimuli.
  • Green anole reproductive behavior is triggered by internal and external stimuli.

Some behaviors occur in cycles.

  • A circadian rhythm is the daily cycle of activity.
    • occurs over 24-hour period
    • run by a biological clock
    • During hibernation, an animal enters a seasonal dormant state.
  • Behaviors may occur daily, monthly, seasonally, or annually.
    • During migration, animals move seasonally from one portion of their range to another.
    • During hibernation, an animal enters a seasonal dormant state.
  • KEY CONCEPT Both genes and environment affect an animal’s behavior.

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