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Depletion of coastal predatory fish sub-stocks coincided with the largest sea urchin grazing event observed in the NE Atlantic.
Ambio ( IF 6.5 ) Pub Date : 2020-07-27 , DOI: 10.1007/s13280-020-01362-4
Kjell Magnus Norderhaug 1, 2 , Kjell Nedreaas 3 , Mats Huserbråten 4 , Even Moland 5, 6
Affiliation  

In this contribution, we propose fishery driven predator release as the cause for the largest grazing event ever observed in the NE Atlantic. Based on the evolving appreciation of limits to population connectivity, published and previously unpublished data, we discuss whether overfishing caused a grazer bloom of the sea urchin (Strongylocentrotus droebachiensis) resulting in overgrazing of more than 2000 km2 kelp (Laminaria hyperborea) forest along Norwegian and Russian coasts during the 1970 s. We show that coastal fisheries likely depleted predatory coastal fish stocks through modernization of fishing methods and fleet. These fish were important predators on urchins and the reduction coincided with the urchin bloom. From this circumstantial evidence, we hypothesize that coastal predatory fish were important in regulating sea urchins, and that a local population dynamics perspective is necessary in management of coastal ecosystems.



中文翻译:

沿海捕食性鱼类种群的枯竭恰逢在大西洋东北部观察到的最大的海胆放牧事件。

在这篇文章中,我们提出渔业驱动的捕食者释放是在大西洋东北部观察到的最大放牧事件的原因。基于对人口连通性限制的不断评价、已发表和以前未发表的数据,我们讨论了过度捕捞是否导致海胆 ( Strongylocentrotus droebachiensis ) 的放牧繁殖,导致超过 2000 公里2海带 ( Laminaria hyperborea ) 的过度放牧) 1970 年代沿挪威和俄罗斯海岸的森林。我们表明,沿海渔业可能通过捕捞方法和船队的现代化耗尽了捕食性沿海鱼类种群。这些鱼是海胆的重要捕食者,而减少的时间恰逢海胆开花。根据这些间接证据,我们假设沿海捕食性鱼类在调节海胆方面很重要,并且在管理沿海生态系统时需要从当地种群动态角度进行分析。

更新日期:2020-07-28
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