Turbulence and feeding behaviour affect the vertical distributions of Oithona similis and Microsetella norwegica
Turbulence and feeding behaviour affect the vertical distributions of Oithona similis and Microsetella norwegica
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DOI：
10.3354/meps313157
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发表时间：
2006-05
影响因子：
2.5
通讯作者：
M. Maar;André W. Visser;T. Nielsen;A. Stips;H. Saito
中科院分区：
文献类型：
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作者：
M. Maar;André W. Visser;T. Nielsen;A. Stips;H. Saito
小型桡足类Oithona similis和Microsetella norwegica的数量往往丰富且分布广泛，但控制其垂直分布的因素以及在碳循环中的作用尚不清楚。在这里，我们研究了桡足类的垂直分布在春季和夏季在斯卡格拉克和秋季在北海就不同的生理化学因素，包括湍流耗散率。伏击者O。桡足类群落以相似种为主，分布于微型动物浮游生物丰度高的层位。M. norwegica占主导地位的Skagerrak和观察内或下方的密度跃层，他们被认为是饲料下沉碎屑聚集。这两种桡足类都使用远程检测的水力机械（O。similis）或化学信号（M. norwegica），这两个鱼种都因表面湍流升高而向更深处迁移。湍流对这两种摄食的潜在影响在理论上都是负面的，我们建议湍流耗散率在10 - 7 ~ 10 - 6 m2 s-3范围内作为触发所观察到的回避反应的阈值。
The small copepods Oithona similis and Microsetella norwegica are often numerically abundant and widely distributed, but the factors controlling their vertical distributions and role in carbon cycling are yet unknown. Here we examined the vertical distributions of copepods during spring and summer in the Skagerrak and during autumn in the North Sea with respect to different physiochemical factors including turbulent dissipation rate. The ambush feeder O. similis numeri- cally dominated the copepod community; they were located in the layers with high microzooplank- ton abundance. M. norwegica were dominant in the Skagerrak and were observed within or just below the pycnocline; they are assumed to feed on sinking detrital aggregates. Both copepods use remote detection of either hydromechanical (O. similis) or chemical signals (M. norwegica) generated by the prey and both species migrated to deeper depths in response to elevated surface turbulence. The potential effect of turbulence on both types of feeding is theoretically shown to be negative and we suggest a turbulent dissipation rate in the range 10 -7 to 10 -6 m 2 s -3 as a threshold triggering the observed avoidance responses.