How internal waves influence the vertical distribution of zooplankton
How internal waves influence the vertical distribution of zooplankton
复制标题
内波如何影响浮游动物的垂直分布
DOI：
10.1111/j.1365-2427.2006.01687.x
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发表时间：
2007
影响因子：
2.7
通讯作者：
J. Benndorf
中科院分区：
文献类型：
--
作者：
Karsten Rinke;Ina Hübner;T. Petzoldt;S. Rolinski;Marie König;J. Post;A. Lorke;J. Benndorf
摘要 1. 我们提供了包岑水库（德国萨克森州）72 小时现场调查的高时空分辨率数据。本次调查的目的是观测春季不稳定分层期间的水物理过程，并研究风引起的内波对浮游动物垂直分布的影响。 2. 高达10 m s 1 的风速导致采样点发生强烈的温水下降事件，并导致产生振幅为4 m 的内波。 3. 浅湖水域浮游动物群落，以帽状水蚤为主。下降流增加了表层的厚度，因此导致浮游动物丰度较高，到达相对较深的水层，表明浮游动物的横向迁移。因此，在下降过程中，特定区域的浮游动物丰度显着增加（最多四倍）。 4. 我们的结论是，由于水物理过程（如内波）的干扰作用，经典的湖泊学现场采样（例如用于监测目的）可能会导致浮游动物丰度估计出现严重偏差。 5. 通过同时部署的声学多普勒电流剖面仪 (600 kHz) 测量的反向散射强度被发现与基于浮游生物样本估计的浮游动物丰度相关。
SUMMARY 1. We present data with a high spatio-temporal resolution from a 72-h field survey in Bautzen Reservoir (Saxony, Germany). The aims of this survey were to observe hydrophysical processes during a period of unstable stratification in spring and investigate the effect of wind-induced internal waves on the vertical distribution of zooplankton. 2. Wind velocities up to 10 m s 1 caused a strong downwelling event of warm water at the sampling site and led to the generation of internal waves with an amplitude of 4 m. 3. The zooplankton community, which was dominated by Daphnia galeata, inhabited epilimnetic waters. Downwelling enlarged the thickness of the epilimnetic layer and, hence, led to high zooplankton abundances down to relatively deep water strata indicating lateral transport of zooplankton. As a consequence, area-specific zooplankton abundances increased considerably (max. fourfold) during downwelling. 4. We conclude that classical limnological field sampling, such as for monitoring purposes, can lead to severely biased estimates of zooplankton abundance due to the interfering effects of hydrophysical processes like internal waves. 5. Backscattering strengths measured by a simultaneously deployed Acoustic Doppler Current Profiler (600 kHz) were found to be correlated with estimated zooplankton abundances based on plankton samples.