Phytoplankton of the Ob Estuary (Kara Sea) in the Season Preceding Winter

IF 1.3 4区地球科学 Q4 OCEANOGRAPHY Oceanology Pub Date : 2024-08-26 DOI:10.1134/s0001437024700164

I. N. Sukhanova, M. V. Flint, A. V. Fedorov, A. A. Nedospasov, S. G. Poyarkov

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Abstract—

The material was obtained during cruise 92 of the R/V Akademik Mstislav Keldysh in the area with a latitudinal extent of 72°32.0′ to 73°14.5′ N, including the Ob River estuary and adjacent shallow shelf on October 12–13 in the period preceding seasonal ice formation. The estuarine front was well pronounced in terms of salinity (gradients 0.6 PSU/km) and temperature fields and had a quasi-meridional direction. Sharp boundaries in nutrient distribution typical of earlier seasons were not observed. The abundance and biomass of phytoplankton varied from 22 × 10³ to 75 × 10³ cells/L and 7.3 to 19.0 mg/m³, respectively, which were two to three orders of magnitude lower than the values obtained in July and September. The abundance (30–78%) and biomass (28–80%) of phytoplankton over the entire area were formed by diatoms, among which Fragilariopsis cylindrus dominated. The abundance of freshwater diatoms Aulacoseira was low and the species was represented only by dead cells. A scheme is presented that shows the boundaries between phytoplankton communities of different composition and quantitative characteristics, as well as the specifics of conditions in the eastern area of the wide external part of Ob river estuary.

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鄂毕河口（喀拉海）冬季前的浮游植物

摘要--材料是 Akademik Mstislav Keldysh 号考察船于 10 月 12-13 日在北纬 72°32.0′ 至 73°14.5′ 区域（包括鄂毕河河口及邻近浅海陆架）进行的第 92 次考察中获得的，当时正值季节性冰层形成之前。从盐度（梯度为 0.6 PSU/km）和温度场来看，河口前沿非常明显，并具有准经度方向。没有观察到前几个季节典型的营养物质分布的明显界限。浮游植物的丰度和生物量分别为 22 × 103 至 75 × 103 cells/L 和 7.3 至 19.0 mg/m3，比 7 月和 9 月的数值低 2 至 3 个数量级。整个区域浮游植物的丰度（30-78%）和生物量（28-80%）均由硅藻构成，其中以圆筒状硅藻为主。淡水硅藻 Aulacoseira 的数量很少，只有死细胞。本报告提出的方案显示了不同组成和数量特征的浮游植物群落之间的界限，以及奥布河口外部宽阔地带东部地区的具体情况。

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来源期刊

Oceanology 地学-海洋学

CiteScore

2.00

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Oceanology, founded in 1961, is the leading journal in all areas of the marine sciences. It publishes original papers in all fields of theoretical and experimental research in physical, chemical, biological, geological, and technical oceanology. The journal also offers reviews and information about conferences, symposia, cruises, and other events of interest to the oceanographic community.