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Amplitude of circadian rhythms becomes weaker in the north, but there is no cline in the period of rhythm in a beetle

Masato S. Abe, Kentarou Matsumura, Taishi Yoshii, Takahisa Miyatake
doi: https://doi.org/10.1101/2020.08.28.272070
Masato S. Abe
1Center for Advanced Intelligence Project, RIKEN, Tokyo, Japan
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Kentarou Matsumura
2Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
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Taishi Yoshii
3Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
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Takahisa Miyatake
2Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
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  • For correspondence: miyatake@okayama-u.ac.jp
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Abstract

Many species show rhythmicity in activity, from the timing of flowering in plants to that of foraging behaviour in animals. The free-running periods and amplitude (sometimes called strength or power) of circadian rhythms are often used as indicators of biological clocks. Many reports have shown that these traits highly geographically variable, and interestingly, they often show latitudinal or altitudinal clines. In many cases, the higher the latitude is, the longer the free-running circadian period (i.e., period of rhythm) in insects and plants. However, reports of positive correlations between latitude or longitude and circadian rhythm traits, including free-running periods, the power of the rhythm and locomotor activity, are limited to certain taxonomic groups. Therefore, we collected a cosmopolitan stored-product pest species, the red flour beetle Tribolium castaneum, in various parts of Japan and examined its rhythm traits, including the power of the rhythm and period of the rhythm, which were calculated from locomotor activity. The analysis revealed that power was significantly lower for beetles collected in northern areas compared with southern areas in Japan. However, it is worth noting that the period of circadian rhythm did not show any clines; specifically, it did not vary among the sampling sites, despite the very large sample size (n = 1585). We discuss why these cline trends were observed in T. castaneum.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted August 31, 2020.
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Amplitude of circadian rhythms becomes weaker in the north, but there is no cline in the period of rhythm in a beetle
Masato S. Abe, Kentarou Matsumura, Taishi Yoshii, Takahisa Miyatake
bioRxiv 2020.08.28.272070; doi: https://doi.org/10.1101/2020.08.28.272070
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Amplitude of circadian rhythms becomes weaker in the north, but there is no cline in the period of rhythm in a beetle
Masato S. Abe, Kentarou Matsumura, Taishi Yoshii, Takahisa Miyatake
bioRxiv 2020.08.28.272070; doi: https://doi.org/10.1101/2020.08.28.272070

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