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首页> 外文期刊>Marine ecology progress series >Tidal and subtidal currents affect deep aggregations of right whale prey, Calanus spp., along a shelf-basin margin
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Tidal and subtidal currents affect deep aggregations of right whale prey, Calanus spp., along a shelf-basin margin

机译：潮汐和潮下潮流影响着右鲸猎物Calanus spp。沿陆架盆地边缘的深层聚集

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摘要

North Atlantic right whales Eubalaena glacialis foraging on deep (>100 m) populations of diapausing Calanus spp. in the Roseway Basin right whale Critical Habitat (south of Nova Scotia, Canada) are most often located along the southern margin of the basin. We investigated the physical and biological oceanographic characteristics that make this margin a lucrative feeding ground. Bottom-moored acoustic Doppler current profilers equipped with conductivity, temperature, and depth sensors were deployed cross-isobath on the southeastern slope of the basin to simultaneously measure variation in Calanus spp. concentration, current velocity, and water mass characteristics in time and space. Variation in upslope tidal advection of deep-basin water with densities >1026 kg m~(-3) and containing highly concentrated copepod aggregations was the most important process influencing cross-isobath variation in copepod concentrations on the slope. The aggregations were maintained in the slope region through time despite extensive along-isobath advection, implying the existence of copepod re-supply mechanisms to the southern margin. Proposed mechanisms include immigration from surface populations, horizontal advection, and gyre-like re-circulation within the basin. A simple empirically-driven particle tracking model illustrated tidally-forced particle convergence between the 100 and 140 m isobaths on the southeastern slope, followed by upward and along-isobath advection. Cross-isobath 'compression' of copepods coupled with the maintenance of their vertical position through neutral buoyancy is proposed as a mechanism resulting in accumulation on the slope, making the area uniquely beneficial to right whales feeding at depth along the slope margin.
机译：北大西洋的露脊鲸Eubalaena glacialis在深度滞育（> 100 m）的Calanus spp种群上觅食。在Roseway盆地的右鲸鱼关键栖息地（加拿大新斯科舍省南部）通常位于该盆地的南部边缘。我们研究了使这一边缘成为有利可图的觅食地的物理和生物海洋学特征。配备电导率，温度和深度传感器的底部系泊声多普勒电流剖面仪在盆地的东南斜坡上跨等温线部署，以同时测量Calanus spp的变化。时空中的浓度，流速和水质特征。密度> 1026 kg m〜（-3）且含有高浓度co足类聚集体的深水上坡潮汐平流变化是影响co足类浓度交叉等值线变化的最重要过程。尽管沿等边平流进行了大范围的平流，但随着时间的流逝，聚集体仍保持在斜坡区域，这表明co足类补给机制存在于南部边缘。拟议的机制包括从地表人口迁移，水平对流以及盆地内的回旋状再循环。一个简单的由经验驱动的粒子追踪模型说明了东南坡上100和140 m等压线之间的潮汐强迫粒子会聚，然后是向上等静流平流。提出了co足类动物的跨等压线“压缩”，以及通过中性浮力维持其垂直位置的机制，该机制可导致斜坡上的积聚，从而使该区域特别有利于露脊鲸深处沿斜坡边缘觅食。

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