... field detection. Among teleost fish, growing evidence suggests that crystals of the mineral magnetite provide the physical basis of the magnetic sense. In this study, juvenile Chinook salmon ( Oncorhynchus tshawytscha ) were exposed to a brief but strong magnetic pulse capable of altering the magnetic...

...David A. Ernst; Kenneth J. Lohmann ABSTRACT The Caribbean spiny lobster, Panulirus argus , is a migratory crustacean that uses Earth's magnetic field as a navigational cue, but how these lobsters detect magnetic fields is not known. Magnetic material thought to be magnetite has previously been...

.... Jensen proposed that the properties of the light-dependent magnetic compass in birds and possibly other organisms can be explained by an interaction between a non-light-dependent magnetic compass (presumably magnetite based) and a vision-based celestial compass (e.g. a spectral gradient or polarized...

...Regina E. Wegner; Sabine Begall; Hynek Burda SUMMARY The mechanism of signal transduction during magnetic compass orientation is rarely evident in vertebrates and is as yet unknown in mammals. This transmission has been associated with magnetite-based receptors innervated by the ophthalmic nerve...

.... To evaluate the possible role of a receptor based on biogenic magnetite in this animal, we performed magnetometry experiments on a set of newts previously used in behavioral assays. The natural remanent magnetization (NRM) carried by these newts was strong enough to be measured easily using a direct-current...

... as a cue, the birds significantly preferred their normal southerly migratory direction. Treatment with a short, strong magnetic pulse designed to alter the magnetization of single-domain magnetite led to a significant deflection towards the east for the next 4 days. This was followed by a period of non...

... system are unknown. Because treatment with a strong magnetic pulse results in a change in the direction of orientation, one of the receptors is thought to involve a magnetizable material such as magnetite. The effects of the magnetizing treatment can be abolished (i.e. the bird returns to its original...

...Robert C. Beason; Natalie Dussourd; Mark E. Deutschlander ABSTRACT The biophysical mechanism of vertebrate magnetic sensory perception has not been completely resolved. We here provide evidence for the use of a magnetic material (probably magnetite) by a vertebrate to detect the earth’s magnetic...

.... 148 – 153 . Berlin : Springer Verlag . Kirschvink , J. L. , Jones , D. S. and Macfadden , B. J. ( 1985 ). Magnetite Biomineralization and Magnetoreception in Organisms: A New Biomagnetism. New York : Plenum Press . Kirschvink , J. L. and Walker , M. M...

... numbers of single-domain particles of magnetite in the anterodorsal abdominal region of honeybees lends credence ( Gould et al . 1978 ), and which alone among the various transduction hypotheses that have been proposed ( Kirschvink & Gould, 1981 ; Kirschvink & Walker, 1985 ; Yorke, 1981 ; Kalmijn...

... the IRM was attained partially below 0·1 T and totally below 0·3 T, we believe that the magnetic material in the bobolink is at least partially single domain magnetite. The relationship between the IRM acquisition and alternating field (a.f.) demagnetization curves indicates that the single or pseudo...