Behavioral evidence for a magnetic sense in the oriental armyworm, Mythimna separata.
Behavioral evidence for a magnetic sense in the oriental armyworm, Mythimna separata.
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东方粘虫 Mythimna separata 磁感的行为证据
DOI：
10.1242/bio.022954
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发表时间：
2017-03-15
期刊：
影响因子：
2.4
通讯作者：
Pan W
中科院分区：
文献类型：
--
作者：
Xu J;Pan W;Zhang Y;Li Y;Wan G;Chen F;Sword GA;Pan W
在了解迁徙昆虫定向导航的机制方面取得了进展，但所涉及的磁罗盘尚未完全阐明。为了研究迁徙粘虫在磁场作用下的飞行方向性，我们开发了一个飞行模拟系统。研究人员将粘虫蛾分别暴露在500nt的极弱磁场、1.8 T的强磁场或偏转磁场中，并在室内黑暗中进行系绳飞行试验。极弱磁场条件下飞蛾定向失稳，其飞行矢量较地磁场条件下分散（方差=0.60）。在1.8 T强磁场作用下，与地磁场作用下相比，平均飞行矢量偏移约105°。在偏转磁场中，飞行方向随磁场方向的变化而变化，也指向磁场的同一方向。在南北磁场和东西磁场中，确定了飞行角分别为98.9°和166.3°，并与相应的磁场方向形成了12.66°和6.19°的夹角。粘虫蛾对磁场强度和方向的变化有反应。这些结果提供了飞蛾依赖磁罗盘的初步迹象。这一发现支持了粘虫Mythimna separata具有用于飞行方向的磁感的假设。摘要：粘虫蛾（Mythimna separata）对磁场强度和方向变化的反应表明其飞行方向依赖于磁罗盘。
ABSTRACT Progress has been made in understanding the mechanisms underlying directional navigation in migratory insects, yet the magnetic compass involved has not been fully elucidated. Here we developed a flight simulation system to study the flight directionality of the migratory armyworm Mythimna separata in response to magnetic fields. Armyworm moths were exposed to either a 500 nT extreme weak magnetic field, 1.8 T strong magnetic field, or a deflecting magnetic field and subjected to tethered flight trials indoors in the dark. The moths were disoriented in the extreme weak magnetic field, with flight vectors that were more dispersed (variance=0.60) than in the geomagnetic field (variance=0.32). After exposure to a 1.8 T strong magnetic field, the mean flight vectors were shifted by about 105° in comparison with those in the geomagnetic field. In the deflecting magnetic field, the flight directions varied with the direction of the magnetic field, and also pointed to the same direction of the magnetic field. In the south-north magnetic field and the east-west field, the flight angles were determined to be 98.9° and 166.3°, respectively, and formed the included angles of 12.66° or 6.19° to the corresponding magnetic direction. The armyworm moths responded to the change of the intensity and direction of magnetic fields. Such results provide initial indications of the moth reliance on a magnetic compass. The findings support the hypothesis of a magnetic sense used for flight orientation in the armyworm Mythimna separata. Summary: Responses to changes in the intensity and direction of magnetic fields in the armyworm moth (Mythimna separata) indicate a reliance on a magnetic compass for flight orientation.