Effect of El Nino on migration and larval transport of the Japanese eel (Anguilla japonica)
Effect of El Nino on migration and larval transport of the Japanese eel (Anguilla japonica)
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DOI：
10.1093/icesjms/fsm091
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发表时间：
2007-10-01
影响因子：
3.3
通讯作者：
Sasaki, Hideharu
中科院分区：
文献类型：
--
作者：
Kim, Heeyong;Kimura, Shingo;Sasaki, Hideharu
为了阐明厄尔尼诺对北太平洋西部日本鳗鱼（日本鳗鲡）迁移的影响，通过数值粒子跟踪模型定性比较了厄尔尼诺和非厄尔尼诺年份鳗鱼幼虫（leptocephali）迁移模式的差异。根据年际的盐度锋和分叉的北赤道流，运输日本鳗鱼幼虫的黑潮远低于棉兰老海流在厄尔尼诺年，在日本沿海栖息地的招聘减少在这些年。在非厄尔尼诺年份，向黑潮的运输量是其两倍，向沿海栖息地的补充量增加。如果鳗鱼的产卵区是独立的厄尔尼诺现象，两个电流之间的运输差异并不清楚。在北太平洋西部，中尺度涡旋对鳗鱼幼体的扩散和迁飞也起着重要作用。因此，与气候变化相关的海洋条件的变化导致了日本鳗鱼的补充减少，日本鳗鱼幼虫的迁移的涡动效应需要加入到北赤道流-黑潮系统。
To clarify the effect of an El Nino on the migration of Japanese eels (Anguilla japonica) in the western North Pacific, differences in migration patterns of eel larvae (leptocephali) in El Nino and non-El Nino years were compared qualitatively through a numerical particle-tracking model. Depending on interannual meridional displacements of the salinity front and bifurcation of the North Equatorial Current, transport of Japanese eel larvae to the Kuroshio was much less than to the Mindanao Current in an El Nino year, and recruitment to coastal habitats in Japan decreased in those years. In non-El Nino years, transport to the Kuroshio was twice as high, and recruitment to coastal habitats increased. If the spawning area of eels was independent of El Nino, transport differences between the two currents were not clear. in the western North Pacific, mesoscale eddies also played a significant role in dispersing eel larvae and prolonging their migration. Consequently, the changing oceanic conditions associated with climate change have resulted in decreased recruitment of Japanese eels, and the eddy effect on migration of the Japanese eel larvae needs to be added into the North Equatorial Current- Kuroshio system.