Diel vertical migration of zooplankton at the S1 biogeochemical mooring revealed from acoustic backscattering strength
Diel vertical migration of zooplankton at the S1 biogeochemical mooring revealed from acoustic backscattering strength
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DOI：
10.1002/2015jc011352
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发表时间：
2016-02
影响因子：
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通讯作者：
R. Inoue;M. Kitamura;T. Fujiki
中科院分区：
文献类型：
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作者：
R. Inoue;M. Kitamura;T. Fujiki
我们研究了浮游动物的昼夜垂直迁移使用的后向散射强度从系泊的声学多普勒海流剖面仪在系泊地点S1在北太平洋副热带环流。高后向散射层的垂直分布和迁移具有季节性变化，冬季深于真光层（<100 m），其他季节则局限于真光层以上。日光时间的季节性变化也影响了昼夜迁徙的时间。我们发现，月球周期影响浮游动物的垂直分布近地表通过改变光照强度。物理事件，如混合层加深和抑制和中尺度涡旋的通过，也可能通过改变食物环境中透光层浮游动物的行为。由于与净样本的比较表明，后向散射可能代表散装生物量，根据净样本的生物量估计的准确性可能会受到浮游动物分布的高度时间变异性的影响。
We examined the diel vertical migration of zooplankton by using the backscatter strength obtained from moored acoustic Doppler current profilers at mooring site S1 in the North Pacific subtropical gyre. There was seasonal variability in the vertical distribution and migration of the high-backscatter layers in that they became deeper than the euphotic zone (<100 m) in winter and were confined above this depth in other seasons. Seasonal changes in daylight hours also affected the timing of the diel migration. We found that lunar cycles affected vertical distributions of zooplankton near the surface by changing the light intensity. Physical events, such as mixed-layer deepening and restratification and the passage of a mesoscale eddy, also affected zooplankton behavior possibly by changing food environment in the euphotic zone. Since the comparison with net samples indicated that the backscatter likely represents the bulk biomass, the accuracy of biomass estimates based on net samples could be influenced by the high temporal variability of zooplankton distributions.