Experimental Evidence of Magnetoreception in Grey Seals Halichoerus Grypus Atlantica Nehring, 1886

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详细

Up-to-date magnetobiology data provide enough evidence that weak magnetic fields, whether of artificial nature or connected with the solar and geomagnetic activity, have a certain biological influence. Magnetoreception – a sense of magnetic fields – is considered to play an important role in the orientation and navigation of some land and marine animals. Many marine mammals, both cetaceans and pinnipeds, migrate over long distances. And when magnetoreception in cetaceans is widely discussed among scientists, there aren’t many works about the sense of magnetic field in pinnipeds. We built an experimental stand based on the Helmholtz coils system to study the magnetosensitivity of pinnipeds. We took three mature female grey seals Halichoerus grypus atlantica as study objects. Seals were trained to choose from two or three identical Helmholtz coils the one which was generating the magnetic field at the moment of observations using the “instrumental conditioned reflex” method and method of selecting an object according to given characteristics. In the course of the experiment, we have found that generated magnetic field of 8, 20 and 36 Hz frequency and 110‒130 μT induction is a detectable stimulus for grey seals at the presentation of which they were able to develop a conditioned refl ex. The average rate of correct choices was over 79% during all check tests. Based on the acquired data we can state that grey seals have the ability of magnetoreception.

作者简介

A. Yakovlev

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Email: mmbi@mmbi.info
Murmansk, Russian Federation

A. Zaytsev

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Murmansk, Russian Federation

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