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Ethological study about direction perception by magnetic sense of a fish

鱼磁感方向知觉的行为学研究

基本信息

批准号：
17560045
负责人：
NISHI Takaaki
金额：
$ 1.98万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

(1) The directional preference of the Japanese eel at the glass eel phase was examined in a radially symmetric test tank.We use d two glass eel populations from two localities; Pacific Ocean coast (east population) and East China Sea coast (west population) of Kyushu.They were tested at the two locations.Both populations showed directional p reference in SW-S on the west coast site while the east population showed inconsistent direction preferences by year and test site.The directional preference disappeared when the geomagnetic field was cancelled.Itseemed that the direction preference differed depending on the glass eel collection season.(2) The olfactory tracts of the Japanese eels were cut and then their magnetosensitivity was tested by the cardiac-conditioning method in a laboratory.While both the control and sham operated specimens showed clear conditioned responses to an artificial magnetic field and the specimens with olfactory tract cut presented no conditioned response, indic … More ating that the olfactory tract contains magnetosensitive nerve cells.Identification of the magneto sensitive nerve cells will be addressed in a future study.(3) The retina of the artificially matured Japanese eels were histologically examined and compared with the retina of wild yellow eels.The cones disappeared in the dorsal retinal region while the rod density did not change with maturation, indicating a semi-deepsea adapted retina in the mature eels.Based on the low temperature tolerance of the eel and the vertical profile of water temperature in the Kuroshio Current, it is postulated that the migrating adult Japanese eel cross the Kuroshio Current at a maximum depth of 600 m.(4) Japanese eel showed electrocardiogram responses in response to the cancellation of the geomagnetic field without a conditioning.This phenomenon could be applied to the examination of the magnetosensitivity in fishes.(5) The mud-skipper, MUTSUGOROU which had been shown to be magnetosensitive, was trained to come a shelter in response to a specific geomagnetic field in a radially symmetric test tank, but the conditioning was not completed. Less

(1)在径向对称的试验池中研究了日本鳗鱼在玻璃鳗阶段的方向偏好。我们使用了来自两个地点的两个玻璃鳗种群；九州的太平洋沿岸（东种群）和东海沿岸（西种群）。在两个地点进行了测试。在西海岸地点，两个种群在SW-S中表现出方向偏好，而东部种群在年份和测试地点上表现出不一致的方向偏好。当地磁场取消时，方向偏好消失。看来，方向偏好根据玻璃鳗采集季节的不同而不同。（2）将日本鳗鱼的嗅束切开，然后在实验室中通过心脏调节方法测试其磁敏感性。而对照组和假手术标本均对人工磁场表现出明显的条件反应，而嗅道切开的标本则没有表现出条件反应，表明嗅束中含有磁敏神经细胞。磁敏神经细胞的鉴定（3）对人工成熟的日本鳗鱼的视网膜进行组织学检查，并与野生黄鳗的视网膜进行比较。随着成熟，视网膜背侧区域的视锥细胞消失，而杆状体的密度没有变化，表明成熟鳗鱼的视网膜具有半深海适应能力。黑潮，据推测，洄游的成年日本鳗鱼在最大深度为 600 m 的地方穿过黑潮洋流。(4) 日本鳗鱼在没有条件反射的情况下，对地磁场的消除表现出心电图反应。这种现象可以应用于鱼类磁敏感性的检查。(5) 弹涂鱼，MUTSUGOROU，已被证明是磁敏，被训练在径向对称的测试罐中响应特定的地磁场而进入掩体，但调节尚未完成。较少的