Unexpected fish and squid in the central Arctic deep scattering layer.
Unexpected fish and squid in the central Arctic deep scattering layer.
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DOI：
10.1126/sciadv.abj7536
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发表时间：
2022-02-18
期刊：
影响因子：
13.6
通讯作者：
EFICA-MOSAiC Team
中科院分区：
文献类型：
--
作者：
Snoeijs-Leijonmalm P;Flores H;Sakinan S;Hildebrandt N;Svenson A;Castellani G;Vane K;Mark FC;Heuzé C;Tippenhauer S;Niehoff B;Hjelm J;Hentati Sundberg J;Schaafsma FL;Engelmann R;EFICA-MOSAiC Team
北冰洋中部（CAO）冰盖的消退引发了对未来渔业的猜测。然而，人们对北极周围330万平方公里生态系统中可捕捞鱼类的存在知之甚少。穿越欧亚盆地，我们记录了一个不间断的3170公里长的深散射层（DSL）与浮游动物和小鱼在大西洋水层在100至500米的深度。昼夜垂直迁移的北极DSL中部是缺乏一年中的大部分时间，当每天的光变化是缺席。出乎意料的是，DSL还包含低丰度的大西洋鳕鱼，沿着灯笼鱼，臂钩鱿鱼，北极特有的冰鳕鱼。大西洋鳕鱼起源于挪威的产卵场，在北极水温下生活了6年。潜在的鱼类丰度远远低于商业上可持续的水平，预计将继续如此，因为CAO的生产力低。大西洋掠食性游泳动物居住在比预期更北的地方，为北极中部生态系统模型增加了一个营养级。
The retreating ice cover of the Central Arctic Ocean (CAO) fuels speculations on future fisheries. However, very little is known about the existence of harvestable fish stocks in this 3.3 million–square kilometer ecosystem around the North Pole. Crossing the Eurasian Basin, we documented an uninterrupted 3170-kilometer-long deep scattering layer (DSL) with zooplankton and small fish in the Atlantic water layer at 100- to 500-meter depth. Diel vertical migration of this central Arctic DSL was lacking most of the year when daily light variation was absent. Unexpectedly, the DSL also contained low abundances of Atlantic cod, along with lanternfish, armhook squid, and Arctic endemic ice cod. The Atlantic cod originated from Norwegian spawning grounds and had lived in Arctic water temperature for up to 6 years. The potential fish abundance was far below commercially sustainable levels and is expected to remain so because of the low productivity of the CAO. Atlantic predatory nekton resides further north than expected, adding a trophic level to the central Arctic ecosystem model.
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