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首页> 外文期刊>Oceanology >Feeding and distribution of zooplankton in the desalinated 'lens' in the Kara Sea: Impact of the vertical salinity gradient
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Feeding and distribution of zooplankton in the desalinated 'lens' in the Kara Sea: Impact of the vertical salinity gradient

机译：喀拉海淡化“晶状体”中浮游动物的摄食和分布：垂直盐度梯度的影响

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摘要

The feeding rates and distribution of dominant zooplankton in the area of the Kara Sea "lens" (upper desalinated layer) were studied in August 2014. Zooplankton abundance was low along the transect across the center of the lens but noticeably increased at the margin of the lens. Calanus glacialis, C. finmarchicus, Oithona similis, and Pseudocalanus spp. dominated among zooplankton, constituting 60-80% of the total biomass. Within the lens area, chlorophyll peaked at a depth of about 10 m, whereas zooplankton was distributed deeper than 30 m, and no diel vertical migrations were recorded. Outside the lens, zooplankton was distributed in the upper mixed layer. Specific daily rations on phytoplankton within the lens area were considerably higher than outside (5-50 and 0.2-6%, respectively). We hypothesized that accumulation of the suspended matter over a sharp density (salinity) gradient contributes to an increase in daily rations. A significant positive correlation between the values of daily ration and salinity gradients was obtained. The grazing impact of zooplankton on the primary production and the phytoplankton biomass was maximum (94 and 8%) at the lens margin, which was due to the combination of high values of zooplankton abundance and daily rations.
机译：2014年8月研究了卡拉海“透镜”（淡化层上部）区域主要浮游动物的摄食率和分布。沿晶状体中心的剖面，浮游动物的丰度较低，但在浮游动物边缘处明显增加。镜片。 Calanus glacialis，C。finmarchicus，Oithona similis和Pseudocalanus spp。在浮游动物中占主导地位，占总生物量的60-80％。在晶状体区域内，叶绿素在约10 m处达到峰值，而浮游动物的分布深度大于30 m，并且未记录diel垂直迁移。在晶状体外部，浮游动物分布在上部混合层中。晶状体区域内浮游植物的特定日进食量明显高于外部（分别为5-50和0.2-6％）。我们假设悬浮物质在急剧的密度（盐度）梯度上的积累会导致日粮的增加。在日粮和盐度梯度之间获得了显着的正相关。浮游植物对初级生产和浮游植物生物量的放牧影响在晶状体边缘最大（94％和8％），这是由于浮游动物丰度和日粮的高价值共同造成的。

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