The correlation between rhythmic changes of body temperature of small passerine birds (Chloris chloris) and non–tidal gravity fluctuation in the 12–30 minute period range

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Abstract

Previously, a connection between animal activity and deformational changes in the lithosphere was established. We have investigated this phenomenon using the example of the relationship between the body temperature dynamics of males of the common greenfinches (Chloris chloris) and gravimeter data. For a 12-30-minute range of periods, a simultaneous change in the power of the prevailing harmonics of body temperature and gravimeter readings is shown, which indicates the presence of a connection between these processes. It is shown that a stable positive correlation occurs only during the period of bird activity. Therefore, fluctuations in the gravimeter readings in the 12–30 minute range of periods can be considered as a marker of an as yet unidentified biotropic environmental factor affecting animal activity.

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About the authors

M. E. Diatroptov

A.N. Severtsov Institute for Ecology and Evolution of the Russian Academy of Sciences

Author for correspondence.
Email: diatrom@inbox.ru
Russian Federation, Moscow

A. V. Surov

A.N. Severtsov Institute for Ecology and Evolution of the Russian Academy of Sciences

Email: diatrom@inbox.ru

Corresponding Member of the RAS

Russian Federation, Moscow

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2. Fig. 1. Average correlation coefficient between minute-by-minute changes in body temperature of greenfinches (n=7) and gravimeter readings over the study period. Medians and interquartile range are presented. A – period from January 15 to February 3, 2023, in conditions of keeping birds under natural light; B – period from February 8 to February 27, 2023, under constant light.

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3. Fig. 2. Dynamics of the median value of minute-by-minute changes in body temperature in a group of greenfinches (n=7) (Row 1) in comparison with minute-by-minute changes in gravimeter readings (Row 2). A – January 22, 2023, r = 0.17; B – January 26, 2023, r = 0.25; C – January 28, 2023, r = 0.10.

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4. Fig. 3. Power spectral density (fast Fourier transform) of body temperature dynamics (Row 1) for a group of greenfinches (n=7) and gravimeter readings (Row 2). A – January 22, 2023; B – January 26, 2023; C – January 28, 2023.

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