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Scientia Silvae Sinicae ›› 2025, Vol. 61 ›› Issue (9): 146-154.doi: 10.11707/j.1001-7488.LYKX20240415

• Research papers • Previous Articles    

Effects of Magnetic Field Intensity on the Termite Locomotor Behaviour and the Magnetic Receptor Genes Expressions

Yongyong Gao1,2,Huan Xu1,2,Wenjing Wang3,Xin Lei1,Yanyi Zhang4,5,Gang Deng4,5,Qiuying Huang2,3,*()   

  1. 1. Key Laboratory in Shaanxi Province of Applied Ecology for Loess Plateau, Yan’an University Yan’an 716000
    2. Key Laboratory of Termite Control of Ministry of Water Resources, Huazhong Agricultural University Wuhan 430070
    3. Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, Huazhong Agricultural University Wuhan 430070
    4. Key Laboratory of Termite Control of Ministry of Water Resources, China Institute of Water Resources and Hydropower Research Beijing 100048
    5. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research Beijing 100038
  • Received:2024-07-08 Online:2025-09-25 Published:2025-10-10
  • Contact: Qiuying Huang E-mail:qyhuang2006@mail.hzau.edu.cn

Abstract:

Objective: In this study, an investigation was conducted on the effects of changing geomagnetic fields on the locomotor behaviours of Odontotermes formosanus and Reticulitermes chinensis, and the response of magnetic receptor genes to different magnetic field, in order to provide a theoretical basis for further elucidating the molecular mechanisms of the termite magnetic behaviours. Method: In this study, the effects of different magnetic field strengths (the strong magnetic field of 0.1 mT and elimination of the horizontal component of the magnetic field) on the locomotor behaviours of the worker termite R. chinensis and O. formosanus under light and dark conditions were investigated. The expression levels of two magnetic receptor genes response to different magnetic fields in two termite species were analyzed. Result: 1) Under light condition, the walking turn angle and angular velocity of O. formosanus increased significantly, but walking velocity and distance had no significant difference in the elimination of the horizontal component of the magnetic field. In the strong magnetic field (0.1 mT), walking turn angle and angular velocity of O. formosanus had no significant difference under light, but walking velocity and distance of O. formosanus increased significantly. Under darkness, walking turn angle, angular velocity, velocity and distance of O. formosanus increased significantly in the elimination of the horizontal component of the magnetic field. In the strong magnetic field (0.1 mT), walking turn angle, angular velocity, velocity and distance of O. formosanus had no significant difference. 2) The walking turn angle, angular velocity, velocity and distance of R. chinensis increased significantly in the elimination of the horizontal component of the magnetic field under light. In the strong magnetic field, walking turn angle, angular velocity, velocity and distance of R. chinensis had no significant difference under light. Under darkness, walking turn angle and angular velocity of R. chinensis increased significantly, but walking velocity and distance had no significant difference in the elimination of the horizontal component of the magnetic field. In the strong magnetic field, walking turn angle, angular velocity, velocity and distance of R. chinensis had no significant difference under light. 3) The expressions of (Cryptochromes 2, Cry2) and MagR were significantly increased under strong magnetic field (0.1 mT) treatment compared to geomagnetic field, but under elimination of horizontal component of magnetic field treatment, the expressions of Cry2 and MagR were significantly reduced in the two termite species. Conclusion: Regardless of whether it is under light or dark conditions, elimination of the horizontal component of magnetic field significantly increases the walking turn angle and angular velocity of the two termite species, suggesting that the magnetic field intensity affects the locomotor behaviour of termites. In addition, the expressions of Cry2 and MagR genes significantly increase under strong magnetic field (0.1 mT) treatment, while the expressions of the two genes significantly decrease under the elimination of horizontal component of magnetic field, indicating that Cry2 and MagR genes in termites can respond to the changes of magnetic field strength, implying that Cry2 and MagR genes may be involved in the regulation of magnetic sensing behaviours in termites.

Key words: termites, locomotor behaviour, magnetic sensing, Cry2, MagR

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