Circahoralian Rhythms of Body Temperature in Mammals and Birds with Different Metabolism Levels
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RAL BIOLOGY
Circahoralian Rhythms of Body Temperature in Mammals and Birds with Different Metabolism Levels M. E. Diatroptova,*, V. A. Panchelyugab, M. S. Panchelyugab, and Corresponding Member of the RAS A. V. Surova Received April 7, 2020; revised June 5, 2020; accepted June 8, 2020
Abstract–The time course of intraperitoneal body temperature has been analyzed in two species of mammals (laboratory C57Bl/6 mice and white-breasted hedgehogs (Erinaceus roumanicus) and in two species of passerine birds (common greenfinch Chloris chloris and Japanese quail Coturnix japonica) with different body weights. Similar sets of basic harmonics appearing synchronously in different individuals have been found in the body temperature spectra of the species studied. The level of basal metabolism in those animal species considerably vary; therefore, the period of fluctuations of body temperature in the range of 10–120 min is not determined by the internal characteristics of the body and, presumably, reflects the influence of an external biotropic environmental factor. Keywords: ultradian rhythm, circahoralian periods, body temperature, synchronizers, mammals, birds DOI: 10.1134/S0012496620050038
Circahoralian rhythms (CRs) in the range of 20– 120 min were identified in the dynamics of many biological systems such as size of nucleus, intensity of protein synthesis, enzyme activity, concentration of hormones and ATP, oxygen consumption, and cytoplasm pH [1]. They were found in bacteria, yeast and several other unicellular organisms, mollusks, and mammalian cells. These rhythms can be detected both in vivo and in vitro [1, 2]. In the majority of researches authors consider CR to be a result of internal regulatory processes of the body or intercellular interactions [3]. However, the possibility of existence of external organizers and synchronizers of those rhythms should be taken into account [4]. A convenient method of recording the rhythmic activity of the body is the assessment of body temperature dynamics that reflects the circadian rhythms, motion, sympathetic tone, and hormone concentration [5–7]. It is thought that ultradian, as well as circahoralian, rhythmicity of body temperature is fully determined by the internal mechanisms of the nervous system [6, 7]. a Severtsov
Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071 Russia b Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142292 Russia *e-mail: [email protected]
The purpose of this study was to detect the main periods of temperature fluctuations in the range of 10–120 min in mammals and birds differing in the metabolic levels. The experimental animals were selected according to their small size associated with higher values of relative body surface and, therefore, higher passive emission of heat allowing the detection of changes in body temperature in a wider range of periods. The experiment involved two classes of homoiothermic animals. Species of each class varied in body weight, he
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