Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the late summers of 2013 and 2015

Ikenoue Takahito; Bjorklund Kjell R.; Fujiwara Amane; Uchimiya Mario; Kimoto Katsunori; Harada Naomi; Nishino Shigeto

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Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the late summers of 2013 and 2015

机译：2013年和2015年夏末在北冰洋西部多囊藻放射虫的水平和垂直分布

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A drastic sea-ice reduction has been observed in the Pacific sector of the Arctic Ocean during the last few decades. However, it is still poorly understood how the future reduction in sea-ice cover will impact the microzooplankton communities within the Arctic marine ecosystems. To elucidate the relationship between hydrographic conditions and the horizontal and vertical distribution of polycystine radiolarians, we analyzed 84 plankton tow samples from 51 stations in the western Arctic Ocean. Radiolarians were commonly observed in the continental slope area and the deeper basin area but were scarce or absent on the continental shelf area during the late summers of 2013 and 2015. The horizontal distribution of radiolarians during this time interval was primarily related to the horizontal distribution of low salinity waters. Radiolarian abundances increased at the stations where the seasonally mixed layer, which was formed by sea-ice melt and river runoff, was observed. This result suggests that freshwater inputs would affect the distribution of radiolarians in the western Arctic, presumably via the modification of their food sources. Vertical distribution of radiolarian species was controlled by temperature and salinity characteristics of each water mass, but their abundance decreased in water masses with low dissolved oxygen.

机译：在过去的几十年中，在北冰洋的太平洋地区观察到海冰急剧减少。但是，人们仍然不太了解未来的海冰覆盖面积减少将如何影响北极海洋生态系统内的微浮游动物群落。为了阐明水文条件与多胱氨酸放射虫的水平和垂直分布之间的关系，我们分析了北冰洋西部51个站点的84个浮游生物丝束样本。在2013年和2015年夏末，大陆斜坡地区和更深的盆地地区普遍观察到放射虫，但在大陆架地区却很少或没有放射虫。在此时间间隔内，放射虫的水平分布主要与水松的水平分布有关。低盐度水域。在观测到由海冰融化和河流径流形成的季节性混合层的站点，放射虫的丰度增加。这一结果表明，淡水输入可能会通过改变其食物来源而影响北极北极地区放射虫的分布。放射虫种类的垂直分布受每个水团的温度和盐度特性的控制，但在低溶解氧的水团中，其丰度降低。

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来源
《Polar biology》 |2019年第2期|285-305|共21页
作者
Ikenoue Takahito; Bjorklund Kjell R.; Fujiwara Amane; Uchimiya Mario; Kimoto Katsunori; Harada Naomi; Nishino Shigeto;
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作者单位

Japan Agcy Marine Earth Sci & Technol, Inst Arctic Climate & Environm Res, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

RIKEN Ctr Sustainable Resource Sci, Tsurumi Ku, 1-7-22 Suehiro, Yokohama, Kanagawa 2300045, Japan;

Japan Agcy Marine Earth Sci & Technol, Res & Dev Ctr Global Change, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

Univ Oslo, Nat Hist Museum, Dept Geol, POB 1172, N-0318 Oslo, Norway;

MERI, Cent Lab, 300 Iwawada, Onjuku, Chiba 2995105, Japan;

Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA;

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正文语种 eng
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关键词
Radiolaria; Arctic Ocean; Sea-ice meltwater; River runoff; Fresh water;

机译：放射虫;北冰洋;海冰融水;河川径流;淡水;

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Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the late summers of 2013 and 2015

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