Atmospheric depression as the final trigger for the seaward migration of the Japanese eel Anguilla japonica
Atmospheric depression as the final trigger for the seaward migration of the Japanese eel Anguilla japonica
复制标题
大气低压是日本鳗鲡向海洄游的最终触发因素
DOI：
10.3354/meps234281
复制
发表时间：
2002
影响因子：
2.5
通讯作者：
H. Oka
中科院分区：
文献类型：
--
作者：
A. Okamura;Y. Yamada;S. Tanaka;N. Horie;T. Utoh;N. Mikawa;A. Akazawa;H. Oka
尽管没有降雨或河流水位的任何上升，日本银鳗的向海迁移经常发生在“干低压”通过后，这表明鳗鱼的迁移行为是由大气低压，而不是降雨或水位升高的影响，因为通常认为。分析表明，银鳗的向海洄游主要发生在秋季至冬季的新月期，水温降低，表明它们的洄游行为至少取决于3个独立的气象因素：水温、月相和低压的通过。然而，水温和月相不足以使鳗鱼开始迁徙。低气压的通过是向海迁移开始的最后事件。这些发现有力地表明，低压的通过可能是银鳗开始向海洋迁移的唯一触发因素。
Despite the absence of rainfall or of any rise in river water level, the seaward migration of Japanese silver eels frequently occurs after the passage of a 'dry depression', suggesting that the migratory behavior of the eels is influenced by the atmospheric depression rather than by rainfall or elevated water level, as is usually thought. Our analyses showed that seaward migration of silver eels takes place mainly during the new moon in autumn to winter as water temperature decreases, sug- gesting the possibility that their migratory behavior depends on at least 3 independent environmen- tal factors: water temperature, lunar phase and the passage of an atmospheric depression. However, water temperature and lunar phase were insufficient to cause the eels to start their migration. The passage of a depression was required as the final event to begin the seaward migration. These find- ings strongly suggest that the passage of a depression may be the only trigger that begins the seaward migration of silver eels.