The osmotic magnetometer: a new model for magnetite-based magnetoreceptors in animals

Щербаков, В. П.; Winklhofer, Michael

doi:10.1007/s002490050222

Cited by 74 publications

(59 citation statements)

References 30 publications

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“…We can only speculate about the physiological mechanisms of the magnetic alignment of ruminants. Of the numerous mechanisms proposed for the direct interaction of electromagnetic fields with the human or animal body, 3 stand out as operating potentially (also) at lower field levels: magnetically sensitive radical pair reactions (19), electric field ion cyclotron resonance interactions (20), and mechanisms based on biogenic magnetite (21)(22)(23)(24). Theoretically, each of these mechanisms (separately or in combination) could be responsible for magnetic alignment.…”

Section: Resultsmentioning

confidence: 99%

Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants

Burda

Begall

Červený

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

101

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Resting and grazing cattle and deer tend to align their body axes in the geomagnetic North-South direction. The mechanism(s) that underlie this behavior remain unknown. Here, we show that extremely low-frequency magnetic fields (ELFMFs) generated by high-voltage power lines disrupt alignment of the bodies of these animals with the geomagnetic field. Body orientation of cattle and roe deer was random on pastures under or near power lines. Moreover, cattle exposed to various magnetic fields directly beneath or in the vicinity of power lines trending in various magnetic directions exhibited distinct patterns of alignment. The disturbing effect of the ELFMFs on body alignment diminished with the distance from conductors. These findings constitute evidence for magnetic sensation in large mammals as well as evidence of an overt behavioral reaction to weak ELFMFs in vertebrates. The demonstrated reaction to weak ELFMFs implies effects at the cellular and molecular levels.cattle ͉ magnetoreception ͉ roe deer ͉ power lines

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Section: Resultsmentioning

confidence: 99%

Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants

Burda

Begall

Červený

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

101

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“…Oliveira et al (2010) estimated that this torque is enough to balance thermal energy at room temperature, even considering SPM haematite particles, a weak magnetic material. The torque acting on this structure Scherbakov & Winklhofer (1999). In the absence of the magnetic field, it is spherical.…”

Section: Ferromagnetic Hypothesismentioning

confidence: 99%

“…It is postulated that the sensor is composed of magnetic nanoparticles, possibly magnetite, housed in a specialized organ that is coupled to mechanosensitive structures so as to transmit information from the geomagnetic field in the form of a torque or force to the nervous system as an electric signal. Based on this hypothesis, several models for transduction have been put forward for SD magnetite chains from early (Yorke 1979) to more recent models (Walker 2008) and for other magnetic particle systems (Presti & Pettigrew 1980;Kirschvink 1989;Sakaki et al 1990;Edmonds 1992Edmonds , 1996Shcherbakov & Winklhofer 1999;Davila et al 2003Davila et al , 2005.…”

Section: Ferromagnetic Hypothesismentioning

confidence: 99%

“…Magneticfield-induced interactions between the SPM particles or aggregates can produce stress on the cellular structures that can then be transduced into the nervous system. Scherbakov & Winklhofer (1999) proposed an osmotic magnetometer based on a single cluster of SPM particles that would deform the cell into a prolate ellipsoid with its long axis parallel to the direction of the magnetic field (figure 3a). Taking into account the observation that the SPM clusters were aggregated in a chain in the pigeon beak , magnetic interactions between clusters were then considered leading to attraction (repulsion) if they were parallel ( perpendicular) to the direction of the magnetic field (figure 3b).…”

Section: Ferromagnetic Hypothesismentioning

confidence: 99%

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Magnetoreception in eusocial insects: an update

Wajnberg

Acosta‐Avalos

Alves

et al. 2010

J. R. Soc. Interface.

110

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Behavioural experiments for magnetoreception in eusocial insects in the last decade are reviewed. Ants and bees use the geomagnetic field to orient and navigate in areas around their nests and along migratory paths. Bees show sensitivity to small changes in magnetic fields in conditioning experiments and when exiting the hive. For the first time, the magnetic properties of the nanoparticles found in eusocial insects, obtained by magnetic techniques and electron microscopy, are reviewed. Different magnetic oxide nanoparticles, ranging from superparamagnetic to multi-domain particles, were observed in all body parts, but greater relative concentrations in the abdomens and antennae of honeybees and ants have focused attention on these segments. Theoretical models for how these specific magnetosensory apparatuses function have been proposed. Neuron-rich ant antennae may be the most amenable to discovering a magnetosensor that will greatly assist research into higher order processing of magnetic information. The ferromagnetic hypothesis is believed to apply to eusocial insects, but interest in a light-sensitive mechanism is growing. The diversity of compass mechanisms in animals suggests that multiple compasses may function in insect orientation and navigation. The search for magnetic compasses will continue even after a magnetosensor is discovered in eusocial insects.

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“…Sensitivity to the field intensity may theoretically be an inherent property of the magnetite-based magnetoreceptor (e.g. Shcherbakov & Winklhofer 1999;Davila et al 2003;Fleissner et al 2007). Alternatively, the magnetic field intensity might provide positional information because it varies across the Earth's surface on both a global (gradients from poles to the equator) and local scale (local field anomalies).…”

Section: Discussionmentioning

confidence: 99%

Changing and shielded magnetic fields suppress c-Fos expression in the navigation circuit: input from the magnetosensory system contributes to the internal representation of space in a subterranean rodent

Burger

Lucová

Moritz

et al. 2010

J. R. Soc. Interface.

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The neural substrate subserving magnetoreception and magnetic orientation in mammals is largely unknown. Previous experiments have demonstrated that the processing of magnetic sensory information takes place in the superior colliculus. Here, the effects of magnetic field conditions on neuronal activity in the rodent navigation circuit were assessed by quantifying c-Fos expression. Ansell's mole-rats (Fukomys anselli), a mammalian model to study the mechanisms of magnetic compass orientation, were subjected to natural, periodically changing, and shielded magnetic fields while exploring an unfamiliar circular arena. In the undisturbed local geomagnetic field, the exploration of the novel environment and/or nesting behaviour induced c-Fos expression throughout the head direction system and the entorhinal-hippocampal spatial representation system. This induction was significantly suppressed by exposure to periodically changing and/or shielded magnetic fields; discrete decreases in c-Fos were seen in the dorsal tegmental nucleus, the anterodorsal and the laterodorsal thalamic nuclei, the postsubiculum, the retrosplenial and entorhinal cortices, and the hippocampus. Moreover, in inactive animals, magnetic field intensity manipulation suppressed c-Fos expression in the CA1 and CA3 fields of the hippocampus and the dorsal subiculum, but induced expression in the polymorph layer of the dentate gyrus. These findings suggest that key constituents of the rodent navigation circuit contain populations of neurons responsive to magnetic stimuli. Thus, magnetic information may be integrated with multimodal sensory and motor information into a common spatial representation of allocentric space within this circuit.

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The osmotic magnetometer: a new model for magnetite-based magnetoreceptors in animals

Cited by 74 publications

References 30 publications

Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants

Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants

Magnetoreception in eusocial insects: an update

Changing and shielded magnetic fields suppress c-Fos expression in the navigation circuit: input from the magnetosensory system contributes to the internal representation of space in a subterranean rodent

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