Siliceous planktons are valuable indicators of the environmental conditions in both modern and past marine settings. However, in contrast to diatoms and radiolarians, other siliceous micro- and nanoplankton in the Arctic Ocean have been rarely explored. In this study, silicoflagellates, endoskeletal dinoflagellate Actiniscus pentasterias and chrysophyte cysts were investigated in one-year mooring sediment trap material (from August 2008 to September 2009) collected in the Northwind Ridge, western Arctic Ocean. The silicoflagellate assemblage was dominated by Stephanocha speculum, accounting for > 71% of the total silicoflagellate composition. While S. speculum was overwhelmingly abundant in summer, S. medianoctisol and S. octonaria were more frequent during winter. The export fluxes of endoskeletal dinoflagellate A. pentasterias did not show clear seasonal pattern except for a peak value in September 2009. We suggest that high flux of A. pentasterias reflects nutrient rich environment at sea ice edge rather than cold under sea ice conditions. High fluxes of chrysophyte cysts were recorded in summer 2009 peaking in late July and early August, ~10 times higher than in summer 2008. Peak of chrysophyte cysts and sea ice melting occurred simultaneously. In addition, observed encystment might be triggered by the population density, hence indicating a favorable environment for phytoplankton blooming. These siliceous micro- and nanoplankton provides information on the modern Arctic Ocean environment but requires further investigations to consolidate knowledge for robust use in paleoceanography.

硅质浮游生物是现代和过去海洋环境中环境条件的宝贵指标。然而，与硅藻和放射虫相比，北冰洋中的其他硅质微型浮游生物和纳米浮游生物很少被探索。在这项研究中，在北冰洋西部 Northwind Ridge 收集的为期一年的系泊沉积物捕集材料（2008 年 8 月至 2009 年 9 月）中对硅鞭毛藻、骨内甲藻Actiniscus pentasterias和金藻孢囊进行了调查。硅鞭毛虫组合以Stephanocha speculum为主，占硅鞭毛虫总成分的 71% 以上。虽然S. speculum在夏季极为丰富，但S. midoctisol和S. octonari a在冬季更为频繁。除了在 2009 年 9 月出现峰值外，骨架内鞭毛藻A. pentasterias的出口通量没有表现出明显的季节性模式。我们认为A. pentasterias 的高通量反映了海冰边缘营养丰富的环境，而不是海冰条件下的寒冷。2009 年夏季记录到高通量的金藻孢囊，在 7 月下旬和 8 月初达到峰值，是 2008 年夏季的 10 倍。金藻孢囊峰值和海冰融化同时发生。此外，观察到的包囊可能是由种群密度引发的，因此表明有利于浮游植物开花的环境。这些硅质微浮游生物和纳米浮游生物提供了有关现代北冰洋环境的信息，但需要进一步调查以巩固知识，以便在古海洋学中稳健使用。