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首页> 外文期刊>ICES Journal of Marine Science >Trophic impact of Atlantic bluefin tuna migrations in the North Sea
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Trophic impact of Atlantic bluefin tuna migrations in the North Sea

机译：大西洋蓝鳍金枪鱼迁移对北海的营养影响

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摘要

Large highly migratory predators can have major impacts on local marine ecosystems by reducing prey populations and leading to trophic cascades that affect the entire fish community. These trophic interactions are typically non-linear and can alter both the migratory behaviour of the predator and the stability of the fish community. The impact of a migrating top-predator is investigated here for Atlantic bluefin tuna in the North Sea. Bluefin tuna has been absent from the region for half-century, but recent years have seen recovery of migrations and a return of bluefin tuna in the area. We use a size spectrum model to analyse the trophic impact of the returning tuna on the entire fish community, under scenarios with varying levels of tuna consumption and fishing mortality on the prey. We show that with high level of prey fishing mortality in the North Sea, the effect of a tuna re-colonization results in only limited trophic cascades. However, high tuna consumption or changes in fishing mortality may result in a sudden recruitment failure of small-pelagic fish due to cascading effects on the fish community. In present-day conditions, the level of tuna consumption that triggers recruitment failure is lower at increasing fishing mortalities on their prey, providing indications for the future sustainable management of both small-pelagics and bluefin tuna in the area.
机译：高度迁徙的大型捕食者可能会减少猎物种群并导致影响整个鱼类群落的营养级联，从而对当地海洋生态系统产生重大影响。这些营养相互作用通常是非线性的，可以改变捕食者的迁徙行为和鱼类群落的稳定性。这里研究了迁徙的顶级捕食者对北海大西洋蓝鳍金枪鱼的影响。该地区已经有半个世纪没有蓝鳍金枪鱼了，但是近年来，该地区的蓝鳍金枪鱼迁移了，移民也有所恢复。在金枪鱼消费水平和捕捞死亡率不同的情况下，我们使用大小谱模型分析返回的金枪鱼对整个鱼类群落的营养影响。我们显示，在北海，由于捕捞渔业死亡率很高，金枪鱼重新定殖的结果只会导致有限的营养级联。但是，由于对鱼类群落的连锁效应，金枪鱼的高消费或捕捞死亡率的变化可能导致小远洋鱼类突然招募失败。在当今情况下，导致捕捞失败的金枪鱼消费水平随着捕捞死亡率的降低而降低，这为该地区小上层金枪鱼和蓝鳍金枪鱼的未来可持续管理提供了迹象。

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