Dogs are sensitive to small variations of the Earth’s magnetic field
Identifieur interne : 001C54 ( Main/Merge ); précédent : 001C53; suivant : 001C55Dogs are sensitive to small variations of the Earth’s magnetic field
Auteurs : Vlastimil Hart [République tchèque] ; Petra Nováková [République tchèque] ; Erich Pascal Malkemper [Allemagne] ; Sabine Begall [Allemagne] ; Vladimír Hanzal [République tchèque] ; Miloš Ježek [République tchèque] ; Tomáš Kušta [République tchèque] ; Veronika N Mcová [République tchèque] ; Jana Adámková [République tchèque] ; Kate Ina Benediktová [République tchèque] ; Jaroslav Erven [République tchèque] ; Hynek Burda [République tchèque, Allemagne]Source :
- Frontiers in Zoology [ 1742-9994 ] ; 2013.
Abstract
Several mammalian species spontaneously align their body axis with respect to the Earth’s magnetic field (MF) lines in diverse behavioral contexts. Magnetic alignment is a suitable paradigm to scan for the occurrence of magnetosensitivity across animal taxa with the heuristic potential to contribute to the understanding of the mechanism of magnetoreception and identify further functions of magnetosensation apart from navigation. With this in mind we searched for signs of magnetic alignment in dogs. We measured the direction of the body axis in 70 dogs of 37 breeds during defecation (1,893 observations) and urination (5,582 observations) over a two-year period. After complete sampling, we sorted the data according to the geomagnetic conditions prevailing during the respective sampling periods. Relative declination and intensity changes of the MF during the respective dog walks were calculated from daily magnetograms. Directional preferences of dogs under different MF conditions were analyzed and tested by means of circular statistics.
Dogs preferred to excrete with the body being aligned along the North–South axis under calm MF conditions. This directional behavior was abolished under unstable MF. The best predictor of the behavioral switch was the rate of change in declination, i.e., polar orientation of the MF.
It is for the first time that (a) magnetic sensitivity was proved in dogs, (b) a measurable, predictable behavioral reaction upon natural MF fluctuations could be unambiguously proven in a mammal, and (c) high sensitivity to small changes in polarity, rather than in intensity, of MF was identified as biologically meaningful. Our findings open new horizons in magnetoreception research. Since the MF is calm in only about 20% of the daylight period, our findings might provide an explanation why many magnetoreception experiments were hardly replicable and why directional values of records in diverse observations are frequently compromised by scatter.
Url:
DOI: 10.1186/1742-9994-10-80
PubMed: 24370002
PubMed Central: 3882779
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<author><name sortKey="Benediktova, Kate Ina" sort="Benediktova, Kate Ina" uniqKey="Benediktova K" first="Kate Ina" last="Benediktová">Kate Ina Benediktová</name>
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<affiliation wicri:level="1"><nlm:aff id="I2">Department of General Zoology, Faculty of Biology, University of Duisburg-Essen, 45117 Essen, Germany</nlm:aff>
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<front><div type="abstract" xml:lang="en"><sec><title>Introduction</title>
<p>Several mammalian species spontaneously align their body axis with respect to the Earth’s magnetic field (MF) lines in diverse behavioral contexts. Magnetic alignment is a suitable paradigm to scan for the occurrence of magnetosensitivity across animal taxa with the heuristic potential to contribute to the understanding of the mechanism of magnetoreception and identify further functions of magnetosensation apart from navigation. With this in mind we searched for signs of magnetic alignment in dogs. We measured the direction of the body axis in 70 dogs of 37 breeds during defecation (1,893 observations) and urination (5,582 observations) over a two-year period. After complete sampling, we sorted the data according to the geomagnetic conditions prevailing during the respective sampling periods. Relative declination and intensity changes of the MF during the respective dog walks were calculated from daily magnetograms. Directional preferences of dogs under different MF conditions were analyzed and tested by means of circular statistics.</p>
</sec>
<sec><title>Results</title>
<p>Dogs preferred to excrete with the body being aligned along the North–South axis under calm MF conditions. This directional behavior was abolished under unstable MF. The best predictor of the behavioral switch was the rate of change in declination, i.e., polar orientation of the MF.</p>
</sec>
<sec><title>Conclusions</title>
<p>It is for the first time that (a) magnetic sensitivity was proved in dogs, (b) a measurable, predictable behavioral reaction upon natural MF fluctuations could be unambiguously proven in a mammal, and (c) high sensitivity to small changes in polarity, rather than in intensity, of MF was identified as biologically meaningful. Our findings open new horizons in magnetoreception research. Since the MF is calm in only about 20% of the daylight period, our findings might provide an explanation why many magnetoreception experiments were hardly replicable and why directional values of records in diverse observations are frequently compromised by scatter.</p>
</sec>
</div>
</front>
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<author><name sortKey=" Erven, J" uniqKey=" Erven J">J Červený</name>
</author>
<author><name sortKey="Neef, J" uniqKey="Neef J">J Neef</name>
</author>
<author><name sortKey="Vojt Ch, O" uniqKey="Vojt Ch O">O Vojtěch</name>
</author>
<author><name sortKey="Burda, H" uniqKey="Burda H">H Burda</name>
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<author><name sortKey="Begall, S" uniqKey="Begall S">S Begall</name>
</author>
<author><name sortKey=" Erven, J" uniqKey=" Erven J">J Červený</name>
</author>
<author><name sortKey="Neef, J" uniqKey="Neef J">J Neef</name>
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<author><name sortKey="N Mec, P" uniqKey="N Mec P">P Němec</name>
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<biblStruct><analytic><author><name sortKey="Begall, S" uniqKey="Begall S">S Begall</name>
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<author><name sortKey="Burda, H" uniqKey="Burda H">H Burda</name>
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<author><name sortKey=" Erven, J" uniqKey=" Erven J">J Červený</name>
</author>
<author><name sortKey="Gerter, O" uniqKey="Gerter O">O Gerter</name>
</author>
<author><name sortKey="Neef Weisse, J" uniqKey="Neef Weisse J">J Neef-Weisse</name>
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<author><name sortKey="N Mec, P" uniqKey="N Mec P">P Němec</name>
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<biblStruct><analytic><author><name sortKey="Slab, P" uniqKey="Slab P">P Slabý</name>
</author>
<author><name sortKey="Tomanova, K" uniqKey="Tomanova K">K Tomanová</name>
</author>
<author><name sortKey="Vacha, M" uniqKey="Vacha M">M Vácha</name>
</author>
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<biblStruct><analytic><author><name sortKey=" Erven, J" uniqKey=" Erven J">J Červený</name>
</author>
<author><name sortKey="Begall, S" uniqKey="Begall S">S Begall</name>
</author>
<author><name sortKey="Koubek, P" uniqKey="Koubek P">P Koubek</name>
</author>
<author><name sortKey="Novakova, P" uniqKey="Novakova P">P Nováková</name>
</author>
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</TEI>
</record>
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