Detection and Processing of Electromagnetic and Near-Field Acoustic Signals in Elasmobranch Fishes

Journal Article

Title: Detection and Processing of Electromagnetic and Near-Field Acoustic Signals in Elasmobranch Fishes
Authors: Kalmijn, A.
Publication Date:
September 29, 2000
Journal: Philosophical Transactions of the Royal Society B: Biological Sciences
Volume: 355
Issue: 1401
Pages: 1135–1141
Publisher: The Royal Society
Stressor:
Receptor:

Document Access

Website: External Link

Citation

Kalmijn, A. (2000). Detection and Processing of Electromagnetic and Near-Field Acoustic Signals in Elasmobranch Fishes. Philosophical Transactions of the Royal Society B: Biological Sciences, 355(1401), 1135–1141.
Abstract: 

The acoustic near field of quietly moving underwater objects and the bio-electric field of aquatic animals exhibit great similarity, as both are predominantly governed by Laplace's equation. The acoustic and electrical sensory modalities thus may, in directing fishes to their prey, employ analogous processing algorithms, suggesting a common evolutionary design, founded on the salient physical features shared by the respective stimulus fields. Sharks and rays are capable of orientating to the earth's magnetic field and, hence, have a magnetic sense. The electromagnetic theory of orientation offers strong arguments for the animals using the electric fields induced by ocean currents and by their own motions in the earth's magnetic field. In the animal's frame of reference, in which the sense organs are at rest, the classical concept of motional electricity must be interpreted in relativistic terms. In the ampullae of Lorenzini, weak electric fields cause the ciliated apical receptor-cell membranes to produce graded, negative receptor currents opposite in direction to the fields applied. The observed currents form part of a positive-feedback mechanism, supporting the generation of receptor potentials much larger than the input signal. Acting across the basal cell membranes, the receptor potentials control the process of synaptic transmission.

Find Tethys on InstagramFind Tethys on FacebookFind Tethys on Twitter
 
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.