Atmospheric depression-mediated water temperature changes affect the vertical movement of chum salmon Oncorhynchus keta
Atmospheric depression-mediated water temperature changes affect the vertical movement of chum salmon Oncorhynchus keta
复制标题
大气低压介导的水温变化影响鲑鱼Oncorhynchus keta的垂直运动
DOI：
10.1016/j.marenvres.2016.05.016
复制
发表时间：
2016
影响因子：
3.3
通讯作者：
Katsufumi Sato
中科院分区：
文献类型：
--
作者：
Takashi Kitagawa;Susumu Hyodo;Katsufumi Sato
日本三陆沿海地区是鲑鱼最南端的自然产卵区之一。在这里，我们报告了它们在产卵季节早期经历大气低压后对环境温度变化的行为反应。在通过之前，所有带电标记的鱼都垂直移动了几个小时，到达100米处浅层温跃层以下的深处。然而，在大气低压期间，三文鱼缩短了垂直移动的时间，大部分时间都在水面上。除水面外，150米深的水柱是均匀的。下降的行为可能已经停止，因为温跃层下面的较冷的水不再处于热限定的层中，这是由于高波作用下的强烈垂直混合。相反，它们可能会在海湾表面较凉爽的水温中度过一段时间，以最大限度地减少迁徙过程中的新陈代谢能量成本。
The Sanriku coastal area, Japan, is one of the southern-most natural spawning regions of chum salmonOncorhynchus keta. Here, we report their behavioral response to changes in ambient temperature after the passage of an atmospheric depression during the early spawning season. Before the passage, all electrically tagged fish moved vertically for several hours to depths below the shallow thermocline at >100 m. However, during the atmospheric depression, the salmon shortened the duration of their vertical movements and spent most time at the surface. The water column was homogenous at <150 m deep except for the surface. The descending behavior may have been discontinued because the cooler water below the thermocline was no longer in a thermally defined layer, due to strong vertical mixing by high wave action. Instead, they likely spent time within the cooler water temperatures at the surface of bays to minimize metabolic energy cost during migration.