Journal ArticleDOI
Electric and magnetic field detection in elasmobranch fishes
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Dogfish and blue sharks were observed to execute apparent feeding responses to dipole electric fields designed to mimic prey, and stingrays showed the ability to orient relative to uniform electric fields similar to those produced by ocean currents.Abstract:
Sharks, skates, and rays receive electrical information about the positions of their prey, the drift of ocean currents, and their magnetic compass headings. At sea, dogfish and blue sharks were observed to execute apparent feeding responses to dipole electric fields designed to mimic prey. In training experiments, stingrays showed the ability to orient relative to uniform electric fields similar to those produced by ocean currents. Voltage gradients of only 5 nanovolts per centimeter would elicit either behavior.read more
Citations
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Journal ArticleDOI
Navigation by induction-based magnetoreception in elasmobranch fishes.
T. C. A. Molteno,W. L. Kennedy +1 more
TL;DR: It is shown that the use of attached magnets would interfere with an induction-based mechanism unless relative movement between the electrosensory system and the attached magnet is less than 100 μm, suggesting that further experiments may be required to eliminate induction as a basis for magnetoreception.
Journal ArticleDOI
A review of the sensory biology of chimaeroid fishes (Chondrichthyes; Holocephali)
TL;DR: A survey of the existing literature on the major senses in chimaeroids is provided in order to stimulate and identify areas for future research to help protect and management of these fascinating fishes.
Book ChapterDOI
Ecological Functions and Adaptations of the Elasmobranch Electrosense
TL;DR: The electrosense response properties are seasonally modified by the periodic expression of gonadal steroids and may serve important modulation of sensory function during reproductive behaviors and are proposed to reflect ontogenetic adaptations to their changing environments.
Journal ArticleDOI
Resting potential of excitable neuroblastoma cells in weak magnetic fields.
TL;DR: If sensitivity of mammalian cells to magnetic fields is mediated by subthreshold changes in membrane potential, as in sensory transduction of sound, light, and other stimuli, then the ion channels responsible for the putative changes are probably present only in specialized sensory neurons or neuroepithelial cells.
Journal ArticleDOI
Insight into shark magnetic field perception from empirical observations.
TL;DR: Impaired experiments support hypotheses that magnetic field perception in sharks is not solely performed via the electrosensory system, and that putative magnetoreceptor structures may be located in the naso-olfactory capsules of sharks.
References
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Journal ArticleDOI
The Electric Sense of Sharks and Rays
TL;DR: The experiments described demonstrate clearly that the shark Scyliorhinus canicula and the ray Raja clavata make a biologically significant use of their electrical sensitivity and are justified in accrediting the animals with an electric sense and in designating the ampullae of Lorenzini as electroreceptors.
Journal ArticleDOI
The response of the ampullae of Lorenzini of elasmobranchs to electrical stimulation.
TL;DR: The ampullae of Lorenzini are sensitive to weak tactile stimulation applied to the ends of their jelly-filled tubes, and either an increase or a decrease in their resting discharge frequency may be caused, each with an opposite after-effect.
Journal ArticleDOI
Electro-perception in Sharks and Rays
TL;DR: Partition of the ampullary system makes the head of Scyliorhinus canicula insensitive to weak electrical stimuli in the area where the eliminated ampullae open, and this affects the biological significance of the electro-perception in sharks and rays.
Journal ArticleDOI
Biophysics of geomagnetic field detection
TL;DR: In biology, the study of geomagnetic orientation has gained new momentum since the discovery of magnetic field detectors in aquatic organisms and the ability of sharks and rays to orient to the earth's magnetic field has been demonstrated in behavioral experiments as discussed by the authors.
Journal ArticleDOI
Electrical sensitivity of the ampullae of Lorenzini.
TL;DR: Investigation has shown that the ampullæ of Lorenzini of elasmobranch fishes are sensitive both to slight changes of temperature and to weak mechanical stimuli, but neither sensory modality is convincing as the biologically adequate stimulus.