直線加速度が魚の行動と眼球運動に与える効果 Effects of Linear Acceleration on Fish Behavior and Eye Movements

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Behavioral responses and eye movements of fish during linear acceleration were reviewed. It is known that displacement of otoliths in the inner ear leads to body movements and⁄or eye movements. On the ground, the utriculus of the vestibular system is stimulated by otolith displacement caused by gravitational and inertial forces during horizontal acceleration of whole body. When the acceleration is imposed on the fish's longitudinal axis, the fish showed nose-down and nose-up posture for tailward and noseward displacement of otolith respectively. These responses were understood that the fish aligned his longitudinal body axis in a plane perpendicular to the direction of resultant force vector acting on the otoliths. When the acceleration was sideward, the fish rolled around his longitudinal body axis so that his back was tilted against the direction in which the inertial force acted on the otoliths. Linear acceleration applied to fish's longitudinal body axis evoked torsional eye movement. Direction of torsion coincided with the direction of acceleration, which compensate the change of resultant force vector produced by linear acceleration and gravity. Torsional movement of left and right eye coordinated with each other. In normal fish, both sinusoidal and rectangular acceleration of 0.1G could evoke clear eye torsion. Though the amplitude of response increased with increasing magnitude of acceleration up to 0.5 G, the torsion angle did not fully compensate the angle calculated from gravity and linear acceleration. Removal of the otolith on one side reduced the response amplitude of both eyes. The torsion angle evoked by rectangular acceleration was smaller than that evoked by sinusoidal acceleration in both normal and unilaterally labyrinthectomized fish. These results suggest that eye torsion of fish include both static and dynamic components.

収録刊行物

  • 宇宙生物科学 = Biological sciences in space  

    宇宙生物科学 = Biological sciences in space 13(1), 9-13, 1999-03 

    日本宇宙生物科学会

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各種コード

  • NII論文ID(NAID)
    10004491610
  • NII書誌ID(NCID)
    AN10164806
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09149201
  • NDL 記事登録ID
    4768892
  • NDL 雑誌分類
    ZR1(科学技術--生物学) // ZM33(科学技術--宇宙科学)
  • NDL 請求記号
    Z18-2504
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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