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首页> 外文期刊>ICES Journal of Marine Science >Investigating and mitigating uncertainties in the assessment of Scottish Nephrops norvegicus populations using simulated underwater television data
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Investigating and mitigating uncertainties in the assessment of Scottish Nephrops norvegicus populations using simulated underwater television data

机译：使用模拟水下电视数据调查和减轻评估苏格兰海螯虾（Nephrops norvegicus）种群的不确定性

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摘要

Nephrops norvegicus is a commercially significant decapod crustacean that excavates and inhabits burrows in muddy sediments throughout the Northeast Atlantic and Mediterranean Sea. Because of its variable emergence behaviour, traditional surveys are considered a poor indicator of the status of its populations, and underwater television (TV) survey methods have been developed. The approach involves towing a TV camera over patches of muddy sediment and counting the number of Nephrops burrow complexes within a known area. Assuming a 1:1 rate of occupancy, the average population density can be estimated. This is raised to the known area of suitable sediment to give a measure of population size. Recently, underwater TV surveys have been used to provide absolute measures of abundance for a number of Nephrops stocks in the North Sea and Northeast Atlantic. It is therefore imperative to identify, quantify, and control for uncertainties in this process. Previous workers have suggested that visual recognition of Nephrops burrows and "edge effects", where single openings of burrow complexes at the sides of the viewed transect are counted, are important sources of uncertainty. This study shows edge effects to be responsible for an overestimation of population size of between 4 and 55%, depending on the width of the field of view and the mean size of the burrow complex. This overestimation is countered to some extent by variability in burrow entrance structure, which leads to Nephrops burrows going unrecognized. The scales of these errors are discussed in relation to observed sediment softness, sediment distribution, and burrow dimensions from sites around Scotland.
机译：Nephrops norvegicus是一种商业上重要的十足纲甲壳纲动物，可在整个东北大西洋和地中海的泥泞沉积物中挖掘和居住。由于其出现的行为多种多样，因此传统调查被认为是其人口状况的较差指标，并且已经开发了水下电视（TV）调查方法。该方法包括将一台电视摄像机拖到泥泞的沉积物上，并计算已知区域内海豚洞穴复合体的数量。假设占用率为1：1，则可以估计平均人口密度。将其升高到合适沉积物的已知区域，以测量种群数量。最近，水下电视调查已被用来绝对量度北海和东北大西洋的许多海螯虾种群的丰度。因此，必须确定，量化和控制此过程中的不确定性。先前的工作人员建议，对海肾洞穴和“边缘效应”的视觉识别是不确定性的重要来源，其中“边际效应”是在所观察样带侧面的单个洞穴复合体开口处进行计数的。这项研究表明，边缘效应可能会导致高估4-55％的人口规模，具体取决于视野的宽度和洞穴复合体的平均大小。这种高估在某种程度上被洞穴入口结构的变化所抵消，这导致了Nephrops洞穴无法被识别。讨论了这些误差的大小，这些误差的大小与从苏格兰周围地区观察到的沉积物软度，沉积物分布和洞穴尺寸有关。

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