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首页> 外文期刊>ICES Journal of Marine Science >Investigating the recent decline in gadoid stocks in the west of Scotland shelf ecosystem using a foodweb model
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Investigating the recent decline in gadoid stocks in the west of Scotland shelf ecosystem using a foodweb model

机译：使用foodweb模型调查苏格兰西部大陆架生态系统西部的蜥蜴类种群最近的下降

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摘要

Abundance and biomass of cod, haddock, and whiting in the waters off of the west coast of Scotland (wcoS) have undergone large changes in recent years, most notably a recent decline. These three species contribute a considerable part of Scottish demersal landings from this area and as such it is important to understand why these stocks are behaving the way they are. A number of explanations for the decline have been proposed, including: seal predation, pressure from Nephrops trawls, and fishing pressure more generally. We used an ecosystem model of the wcoS continental shelf (<200 m depth) to investigate whether these proposed explanations for declining gadoid stocks are feasible. Results suggest that the rise in the grey seal population over recent years has not led to the decline in gadoid stocks; there is insufficient bycatch by the Nephrops fleet to have a large impact on gadoid stocks; however, fishing, as a key driver of the west of Scotland shelf ecosystem, has impacted stocks and by decreasing fishing levels to maximum sustainable yield cod biomass may increase slightly though not returning to previous levels. Although this means we are little further forward in understanding the cause of recent gadoid declines in the area, the development of this model has enabled us to further our knowledge and understanding of aspects of trophic structure and the impacts of fishing on the wcoS.
机译：近年来，苏格兰西海岸水域中鳕鱼，黑线鳕和鳕鱼的丰度和生物量发生了巨大变化，最显着的是最近的下降。这三个物种为该地区的苏格兰沉没登陆做出了很大贡献，因此重要的是要了解为什么这些种群的行为方式如此。已经提出了许多有关下降的解释，包括：海豹捕食，海螯虾拖网带来的压力以及更普遍的捕鱼压力。我们使用了wcoS大陆架（深度小于200 m）的生态系统模型来研究这些建议的解释下降的象样种群是否可行。结果表明，近几年灰海豹种群的增加并未导致光荣的种群减少。 Nephrops船队的兼捕不足以对过高的库存产生重大影响；但是，捕鱼作为苏格兰西部架子生态系统的主要驱动力，已经影响了种群，通过降低捕鱼水平至最大的可持续产量，鳕鱼生物量可能会略有增加，尽管不会恢复到以前的水平。尽管这意味着我们在了解该地区最近的过高下降率的原因方面并没有什么进步，但是该模型的发展使我们能够进一步了解和理解营养结构的各个方面以及捕捞对wcoS的影响。

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