Detection of Magnetic Fields in Elasmobranchs
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Questions and Answers

What type of experiments have shown that elasmobranchs can detect magnetic fields?

  • Magnetic displacement experiments
  • Feeding experiments
  • Magnetoreception experiments (correct)
  • Migration experiments
  • In the stingray experiment, what occurred when the magnetic field was turned on?

  • Showed no preference in feeding
  • Avoided the magnetic side (correct)
  • Feed on both sides equally
  • Avoided the control side
  • What is a possible application of elasmobranchs' sensitivity to magnetic fields mentioned in the text?

  • Migration direction alteration
  • Enhanced feeding efficiency
  • Acoustic communication improvement
  • Repelling rays for fishing mortality reduction (correct)
  • What conclusion can be drawn from the laboratory 'magnetic displacement' experiments with pink salmon?

    <p>They use magnetic fields for direction</p> Signup and view all the answers

    How did sharks behave across a 1.5 X 1.5 m2 target in the magnetoreception experiment?

    <p>Passed across at varying speeds</p> Signup and view all the answers

    What did the stingrays do when there was no magnetic field present in the feeding apparatus experiment?

    <p>Fed equally on both sides</p> Signup and view all the answers

    What is the purpose of electrolocation in weakly electric fish?

    <p>Detect object distance, size, shape, and properties</p> Signup and view all the answers

    Which type of fish uses the jamming avoidance response (JAR) to prevent a breakdown in electrocommunication?

    <p>Mormyridae</p> Signup and view all the answers

    What gene was selected for the production of electric signals and expressed only in electric organs following whole-genome duplication?

    <p>Scn4aa</p> Signup and view all the answers

    What type of sequence evolution was observed in the new gene, Scn4aa, related to the origin of electric organs?

    <p>Rapid sequence evolution</p> Signup and view all the answers

    What do mutations of Scn4aa in mormyroids and gymnotiforms result in?

    <p>Prolonged depolarizations</p> Signup and view all the answers

    Which species use electric signals for communication according to the text?

    <p>Mormyridae and Gymnotiformes</p> Signup and view all the answers

    Which sensory modality allows some fish to detect magnetic fields?

    <p>Magnetoreception</p> Signup and view all the answers

    Which of the following is not a type of electroreceptor found in fish?

    <p>Photoreceptor</p> Signup and view all the answers

    Which of the following fish species does not produce a strong electric discharge for stunning prey?

    <p>African knifefish</p> Signup and view all the answers

    Where are electroreceptors typically located in fish?

    <p>On the skin</p> Signup and view all the answers

    Which of the following is not a sensory modality used by fish to acquire information from their surroundings?

    <p>Touch</p> Signup and view all the answers

    Which of the following is not a type of electric organ found in fish?

    <p>Electric shark organ</p> Signup and view all the answers

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