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首页> 外文期刊>ICES Journal of Marine Science >Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures
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Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures

机译：使用数据存储标签量化鳕鱼的垂直运动：对声学措施的影响

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摘要

Depth data from archival tagging studies of cod (Gadus morhua) were used in three different analyses with the aim of testing basic assumptions of cod behaviour. Examination of post-release depth profiles from cod tagged in the Barents, North, and Irish Seas revealed that some cod underwent a post-release period of adaptation to increasing depth as they readjusted their buoyancy to its pre-tagging level. This depth adaptation behaviour was characterized by gradually increasing mean depth, and enabled the calculation of neutral-buoyancy compliant descent rates, which were less than 1 mh~(-1). Estimated rates of vertical movement were shown to be highly dependent upon the frequency at which depth was sampled. Maximum estimated rates of ascent and descent from sampling intervals of 10 or 15 min were inconsistent with the maintenance of neutral buoyancy, but estimates from sampling intervals greater than 1 h were not. Calculation of tilt angles using depth data sampled at 10-s intervals showed that cod were often tilted more than 5° relative to the horizontal, and that this effect was more pronounced at night. These findings suggest that basic assumptions regarding cod physiology and behaviour require revision if the accuracy and precision of acoustic methods are to be improved.
机译：来自鳕鱼档案标记研究的深度数据被用于三种不同的分析中，目的是检验鳕鱼行为的基本假设。对在巴伦支，北海和爱尔兰海中标记的鳕鱼的释放后深度剖面的检查显示，一些鳕鱼在释放后适应了不断增加的深度，因为他们将浮力重新调整至其标记前的水平。这种深度适应行为的特征是逐渐增加平均深度，并能够计算小于1 mh〜（-1）的中性浮力顺从下降率。估计的垂直运动速率高度依赖于采样深度的频率。采样间隔为10或15分钟的最大估计上升和下降速率与保持中性浮力不一致，但采样间隔大于1 h的估计则不一致。使用以10秒间隔采样的深度数据计算倾斜角表明，鳕鱼通常相对于水平倾斜超过5°，并且这种影响在夜间更为明显。这些发现表明，如果要提高声学方法的准确性和精度，则需要修改有关鳕鱼生理和行为的基本假设。

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