Interaction between diel vertical migration of a mysidacean shrimp and two-layered estuarine flow
Interaction between diel vertical migration of a mysidacean shrimp and two-layered estuarine flow
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糠虾昼夜垂直洄游与河口两层流的相互作用
DOI：
10.1007/bf00004175
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发表时间：
1986
期刊：
影响因子：
2.6
通讯作者：
J. J. Orsi
中科院分区：
文献类型：
--
作者：
J. J. Orsi
新麦氏新种具有与两层河口水流相互作用的垂直迁移模式和混浊的圈闭带，以防止种群被冲出萨克拉门托-圣华金河口上游。在捕捉区，整夜潮汐都在近水面处可见，但只有在涨潮时白天才会出现在该高度。在捕捉区下游较清澈的水中，白天在水面附近找不到丝虫。在这两个地方，接近水面的幼体比例高于成体。在向海移动的表层中，从捕获区向下游席卷的个人显然是通过底层密度流被带回上游的。因此，种群在垂直和纵向上循环，但没有净向海移动，除非对捕获区位置的变化做出反应。由于它们在潮汐上的表层丰度更高，从而使它们逆流而上，新生儿的丰度低于成年海面上的捕获区。
Neomysis mercedis (Holmes) has a diel vertical migration pattern that interacts with two-layered estuarine flow and a turbid entrapment zone to keep the population from being swept out of the upper Sacramento-San Joaquin Estuary. In the entrapment zone mysids are found near surface on all night tides but are present at that level during day only on flood tides. In the clearer water downstream from the entrapment zone mysids are not found near surface during day. In both locations a higher percentage of juveniles than adults are near surface. Individuals swept downstream from the entrapment zone in the seaward moving surface layer are apparently transported back upstream via the bottom density current. Thus, the population circulates both vertically and longitudinally but there is no net seaward movement except in response to changes in location of the entrapment zone. Due to their greater near surface abundance on flood tides which move them upstream, neonates are less abundant than adults seaward of the entrapment zone.