Viruses, bacteria, and heterotrophic nanoflagellates in Laptev Sea plankton

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• 作者：A. I. Kopylov ; A. F. Sazhin ; E. A. Zabotkina ; A. V. Romanenko ; N. D. Romanova…
• 刊名：Oceanology
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：56
• 期：6
• 页码：789-798
• 全文大小：
• 刊物主题：Oceanography;
• 出版者：Pleiades Publishing
• ISSN：1531-8508
• 卷排序：56

文摘

The paper considers the concentrations and functional characteristics of viruses, bacteria, and heterotrophic nanoflagellates determined for the first time in the Laptev Sea in August-September, 2014. The abundance of bacteria, viruses, and heterotrophic nanoflagellates varied from 110.1 × 103 to 828.4 × 103 cells/mL, from 384.2 × 103 to 2932.8 × 103 particles/mL, and from 108 to 651 cells/mL, respectively. The daily bacterioplankton production varied from 4.2 × 103 to 381.7 × 103 cells/mL, with an average of 117.6 × 103 cells/mL. Electron transmission microscopy has for the first time shown that the frequency of visibly infected bacterial cells varied from 0.2 to 2.0% (0.8% on average) of N_B. The average virus-induced mortality of bacteria was 6.3% of bacterioplankton production, with variations ranging from 1.4 to 16.9%. Grazing on bacteria by heterotrophic nanoflagellates contributed more to bacteria mortality than virus-induced bacterial lysis. By grazing on bacteria, heterotrophic nanoflagellates consumed large quantities of viruses located on the surface and inside bacterial cells.