Abstract

The distribution of heterotrophic bacteria, viruses, and heterotrophic nanoflagellates was studied in the shelf waters of the East Siberian Sea along the meridional transect from the Kolyma River delta in September. The production of heterotrophic bacteria and their mortality as a result of protozoan grazing and lysis of viruses were also determined. The patterns of the spatial distribution of microorganisms and viruses varied: the number of bacterioplankton decreased with increasing distance from the Kolyma delta, while, on the contrary, its size and biomass increased to the shelf areas with negative water temperatures. The highest abundance and biomass of virioplankton were recorded at the extreme southern and northern stations of the transect and the abundance and biomass of heterotrophic nanoflagellates increased from the south to the north. The studied shelf waters were characterized by a high concentration of fine-textured detrital particles, and, as a consequence, a relatively large number of viruses attached to detritus. The mortality of heterotrophic bacterioplankton accounted for most of its daily production. Protozoan grazing was the main cause of bacterial mortality that significantly exceeded their mortality due to viral lysis.

中文翻译：

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西伯利亚东部大陆架上异养生物与病毒的分布及其关系

摘要

9月，研究人员在东西伯利亚海的架子水沿科雷马河三角洲的子午断面研究了异养细菌，病毒和异养纳米鞭毛虫的分布。还确定了原生动物放牧和病毒裂解后异养细菌的产生及其死亡率。微生物和病毒的空间分布方式各不相同：浮游细菌的数量随着距科雷马河三角洲距离的增加而减少，相反，当水温为负值时，浮游细菌的大小和生物量增加到架子区域。在样带的最南端和最北端记录到了浮游生物的最高丰度和生物量，异养纳米鞭毛虫的丰度和生物量从南到北增加。所研究的架子水的特征是高浓度的细碎屑颗粒，因此，附着在碎屑上的病毒数量相对较多。异养浮游细菌的死亡率占其日常生产的大部分。原生动物放牧是细菌死亡的主要原因，由于病毒裂解，细菌死亡大大超过了它们的死亡率。