Vertical migrations and transport of larval fish in a partially mixed estuary
Vertical migrations and transport of larval fish in a partially mixed estuary
复制标题
部分混合河口幼鱼的垂直洄游和运输
DOI：
10.1139/f83-179
复制
发表时间：
1983
影响因子：
2.4
通讯作者：
W. C. Leggett
中科院分区：
文献类型：
--
作者：
L. Fortier;W. C. Leggett
研究了半昼夜垂直迁移对部分混合河口鱼苗水平迁移的影响，以及引起这种迁移的外部刺激。在St. Lawrence河口上游固定站位，每隔1 h，测定129 h浮游鱼和微型浮游动物的垂直分布。随着长度的增加，毛鳞鱼（Mallotus villosus）幼虫聚集在离水面更近的地方。这导致了该物种向海漂移的长度依赖加速。较大的毛鳞鱼在地表（0-20 m）形成了微弱但显著的垂直迁移模式。早期大西洋鲱鱼（Clupea harengus harengus）的平均垂直位置接近零纵向速度深度。在这个平均水平的垂直迁移遵循一个半日循环，使后期幼虫在洪水期间向地面迁移。这种同步最小化了与入侵有关的向海潮汐漂移……
The effect of diel or semidiurnal vertical migrations on the horizontal dispersal of fish larvae in a partially mixed estuary, and the external stimuli triggering these migrations, were investigated. The vertical distribution of ichthyoplankton and microzooplankton was estimated at 1-h intervals for 129 h, at a fixed station of the St. Lawrence upper estuary. With increasing length, capelin (Mallotus villosus) larvae congregated closer to the surface. This resulted in a length-dependent acceleration of the seaward drift of this species. Larger capelin developed a weak but significant pattern of diel vertical migrations limited to the surface (0–20 m) layer. The average vertical position of early postlarval Atlantic herring (Clupea harengus harengus) was close to the depth of null longitudinal velocity. Vertical migrations about this average level followed a semidiurnal cycle which brought the postlarvae toward the surface during flood. This synchronization minimized seaward tidal drift linked to incursion...