18 Questions
What type of experiments have shown that elasmobranchs can detect magnetic fields?
Magnetoreception experiments
In the stingray experiment, what occurred when the magnetic field was turned on?
Avoided the magnetic side
What is a possible application of elasmobranchs' sensitivity to magnetic fields mentioned in the text?
Repelling rays for fishing mortality reduction
What conclusion can be drawn from the laboratory 'magnetic displacement' experiments with pink salmon?
They use magnetic fields for direction
How did sharks behave across a 1.5 X 1.5 m2 target in the magnetoreception experiment?
Passed across at varying speeds
What did the stingrays do when there was no magnetic field present in the feeding apparatus experiment?
Fed equally on both sides
What is the purpose of electrolocation in weakly electric fish?
Detect object distance, size, shape, and properties
Which type of fish uses the jamming avoidance response (JAR) to prevent a breakdown in electrocommunication?
Mormyridae
What gene was selected for the production of electric signals and expressed only in electric organs following whole-genome duplication?
Scn4aa
What type of sequence evolution was observed in the new gene, Scn4aa, related to the origin of electric organs?
Rapid sequence evolution
What do mutations of Scn4aa in mormyroids and gymnotiforms result in?
Prolonged depolarizations
Which species use electric signals for communication according to the text?
Mormyridae and Gymnotiformes
Which sensory modality allows some fish to detect magnetic fields?
Magnetoreception
Which of the following is not a type of electroreceptor found in fish?
Photoreceptor
Which of the following fish species does not produce a strong electric discharge for stunning prey?
African knifefish
Where are electroreceptors typically located in fish?
On the skin
Which of the following is not a sensory modality used by fish to acquire information from their surroundings?
Touch
Which of the following is not a type of electric organ found in fish?
Electric shark organ
Explore the fascinating ability of elasmobranchs to detect magnetic fields through behavioural experiments. Learn about the study conducted by Meyer et al. in 2005 and the responses of sharks and stingrays to magnetic field activation.
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