Abstract Displacement of fisheries through management has the potential to re-distribute the anthropogenic pressures associated with fishing practices. These anthropogenic pressures occur concurrently with naturally occurring environmental processes, and their combined influences can alter the structure of species assemblages across a region. Spatial variability in the demersal assemblages in the Celtic Sea and western English Channel were examined in relation to the influence of abrasion (relating to trawling pressure from bottom-towed fishing gears) and natural hydrodynamic processes (using kinetic energy as a measure of bed shear stress) using canonical correspondence analysis. Kinetic energy graduated from low levels in the western part of the study area to higher levels in the east, whilst trawling pressure varied at smaller spatial scales largely focussed on fishing grounds. Species assemblages were correlated with kinetic energy, with some species of commercial value being more strongly associated with areas subject to increased trawling pressure. However, the species assemblages at similar stages along this gradient of kinetic energy differed between ICES Divisions within the study area. Due to these regional differences, any management measures that may result in the re-distribution of fishing pressure should consider the potential impact on those assemblages (and associated species) that may then be subject to increased fishing disturbance.

中文翻译：

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自然和人为因素对英吉利海峡西部和凯尔特海底层动物群的影响

摘要 通过管理转移渔业有可能重新分配与捕捞实践相关的人为压力。这些人为压力与自然发生的环境过程同时发生，它们的综合影响可以改变整个地区的物种组合结构。研究了凯尔特海和英吉利海峡西部底层组合的空间变异性与磨损（与底拖渔具的拖网压力有关）和自然水动力过程（使用动能作为床剪切应力的量度）的影响) 使用规范对应分析。动能由研究区西部的低水平向东部的高水平渐变，而拖网压力在较小的空间尺度上变化主要集中在渔场。物种组合与动能相关，一些具有商业价值的物种与受拖网捕捞压力增加的区域有更密切的联系。然而，沿着这个动能梯度在相似阶段的物种组合在研究区域内的 ICES 部门之间有所不同。由于这些区域差异，任何可能导致捕捞压力重新分配的管理措施都应考虑对那些可能会受到捕捞干扰增加的组合（和相关物种）的潜在影响。一些具有商业价值的物种与拖网捕捞压力增加的地区有更密切的联系。然而，沿着这个动能梯度在相似阶段的物种组合在研究区域内的 ICES 部门之间有所不同。由于这些区域差异，任何可能导致捕捞压力重新分配的管理措施都应考虑对那些可能会受到捕捞干扰增加的组合（和相关物种）的潜在影响。一些具有商业价值的物种与拖网捕捞压力增加的地区有更密切的联系。然而，沿着这个动能梯度在相似阶段的物种组合在研究区域内的 ICES 部门之间有所不同。由于这些区域差异，任何可能导致捕捞压力重新分布的管理措施都应考虑对那些可能受到捕捞干扰增加的组合（和相关物种）的潜在影响。