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Winter microalgal communities of the southern Sea of Okhotsk: A comparison of sea ice, coastal, and basinal seawater
Progress in Oceanography ( IF 4.1 ) Pub Date : 2022-04-28 , DOI: 10.1016/j.pocean.2022.102806
Dong Yan , Jun Nishioka , Takenobu Toyota , Koji Suzuki

The Sea of Okhotsk is a marginal sea of the western North Pacific Ocean and a key region for the seawater circulation of the North Pacific. In winter, a large amount of sea ice forms over the northern shelf and off the eastern Sakhalin coast. The sea ice is transported to the southern part of the sea by the fresh and cold East Sakhalin Current (ESC). Microalgae are the main players in the primary production of the sea ice ecosystems. We investigated the winter microalgal communities of the sea ice ecosystem in the southern Sea of Okhotsk, including the communities living in sea ice and seawater using microscopy and DNA barcoding. The results showed that diatoms were the major component in the microalgal communities. Sea ice algal communities were dominated by Thalassiosira spp., Porosira glacialis, and Fragilariopsis cylindrus, while other typical sea ice pennate diatoms were rarely found. The seawater stations were separated into two groups by hydrological conditions: coastal stations strongly affected by ESC; basinal stations influenced by the deep mixing and the basinal gyre. Small-sized diatoms and naked nanoflagellates were more abundant at the ESC-influenced stations that had higher concentrations of dissolved Fe (DFe) and ammonia (NH4). In particular, spores of Chaetoceros dominated the ESC-influenced seawater. Representative algal taxa specific to the basinal stations, including the diatom Shionodiscus spp., the haptophyte Coccolithus pelagicus, and the dinoflagellate Prorocentrum minimum, were either typical for the basinal gyres or the remnants of the autumn algal blooms. The results suggested that the winter phytoplanktonic communities of the southern Sea of Okhotsk were dependent almost entirely on whether they were within the influence of the ESC. Ice algae were far more abundant than phytoplankton, indicating their major role in the seeding of the spring bloom.



中文翻译:

鄂霍次克南部海的冬季微藻群落:海冰、沿海和盆地海水的比较

鄂霍次克海是北太平洋西部的边缘海,是北太平洋海水环流的关键区域。冬季,北部大陆架和库页岛东部海岸附近会形成大量海冰。海冰被新鲜和寒冷的东库页岛洋流(ESC)输送到海的南部。微藻是海冰生态系统初级生产的主要参与者。我们使用显微镜和 DNA 条形码研究了鄂霍次克海南部海冰生态系统的冬季微藻群落,包括生活在海冰和海水中的群落。结果表明,硅藻是微藻群落的主要成分。海冰藻群落以Thalassiosira spp.为主,Porosira glacialisFragilariopsis cylindrus等典型的海冰斑状硅藻很少被发现。海水站按水文条件分为两组:受 ESC 影响较大的沿海站;受深层混合和盆地环流影响的盆地台站。在溶解铁 (DFe) 和氨 (NH 4 )浓度较高的受 ESC 影响的站点中,小型硅藻和裸露的纳米鞭毛虫更为丰富。特别是,角毛藻的孢子在ESC 影响的海水中占主导地位。特定于盆地站的代表性藻类群,包括硅藻Shionodiscus spp。, haptophyte Coccolithus pelagicus,和甲藻Prorocentrum 最小值,要么是典型的盆地环流,要么是秋季藻华的残余。结果表明,鄂霍次克海南部的冬季浮游植物群落几乎完全取决于它们是否在 ESC 的影响范围内。冰藻比浮游植物丰富得多,表明它们在春季开花的播种中起主要作用。

更新日期:2022-04-30
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