The study examined the changes in intraperitoneal body temperature of laboratory mice, Jungar hamsters, European greenfinch Chloris chloris, and starlings. In a few minutes range, these changes significantly correlated not only between the animals of the same species, but also between the different classes such as birds and mammals, which were isolated from each other and maintained under different illumination regimen. This phenomenon indicates some external influence(s) on the central mechanisms of the thermal control system not related to illumination regiment. In 80% cases, the phases of most pronounced rhythms of body temperature oscillating with the periods of 8-9 and 12-13 min coincided with those of geomagnetic field within the accuracy of ±1 min. However, the amplitude of body temperature oscillations did not depend on the amplitude of geomagnetic field (GMF) oscillations. Synchronicity of the changes in body temperature and GMF was observed at the amplitude of GMF oscillation of 0.4 nT, which is extremely low value. In contrast, there was no reaction of body temperature to greater (6-10 nT) but irregular and abrupt perturbations of GMF.
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Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 171, No. 3, pp. 373-378, March 2021
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Diatroptov, M.E. Changes in Body Temperature of Small Mammals and Birds in a Few Minutes Range as Reflection of Environmental Influences. Bull Exp Biol Med 171, 388–392 (2021). https://doi.org/10.1007/s10517-021-05234-z
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DOI: https://doi.org/10.1007/s10517-021-05234-z