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The impact of the sandeel fishery closure in the northwestern North Sea on seabird food consumption, distribution and productivity

机译：北海西北部桑德尔渔业关闭对海鸟食物消费，分布和生产力的影响

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摘要

In the North Sea, the lesser sandeel (Ammodytes marinus) is the target of an industrial fishery and the principal prey of many top predators. Because of concerns about potential effects on predators, the sandeel fishery off eastern Scotland was closed in 2000, and local sandeel abundance increased subsequently. To examine whether closure benefitted sandeel-dependent seabirds, we compared summer sandeel consumption, at-sea distributions, and breeding success of seven species with fishery removals and abundance of older (1+ group) and young-of-the-year (0 group) sandeels from 1996 to 2003. Breeding success of black-legged kittiwake (Rissa tridactyla), a species that has declined in recent decades, was related to abundance of both 1+ group (the age class targeted by the fishery) and 0 group sandeels. The proportion of 0 group consumed by kittiwakes and proportion of the kittiwake population foraging in the area were linked to 0 group abundance. None of these parameters in the other seabird species were associated with sandeel abundance. Our results suggest that fishery closure can have a beneficial impact on top predators sensitive to variation in abundance of the target species, although environmental conditions before and after closure are also likely to be critically important.
机译：在北海，较小的沙e（Ammodytes marinus）是工业化渔业的目标，也是许多顶级捕食者的主要猎物。由于担心对捕食者的潜在影响，苏格兰东部沿海的桑德尔渔业于2000年关闭，当地桑德尔的丰度随后增加。为了检查封闭是否有益于依赖于沙e的海鸟，我们比较了夏季沙e的消费，海上分布以及七个物种的捕捞成功与渔业去除以及年长（1+组）和年幼（0组）的丰富度。 ）从1996年至2003年的黑e。近十年来黑脚黑ti（Rissa tridactyla）的繁殖成功，与1+组（渔业所针对的年龄段）和0组黑e的丰度有关。零食所占的0组比例和该地区觅食的零食种群所占比例与0组的丰富度有关。其他海鸟物种中的这些参数都没有与桑德尔的丰富度相关。我们的结果表明，渔业封锁可能对敏感的目标物种的丰度敏感的顶级捕食者产生有益的影响，尽管封锁前后的环境条件也很重要。

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