Abstract—

Materials collected in different seasons in the region of the Yenisei estuary, as well as previously published data, were used to analyze the scale and patterns of the seasonal variability of microbial communities. In all seasons concerned, three zones could be distinguished in the estuarine area based on the salinity values. The abundance and activity of bacterioplankton in these zones varied by an order of magnitude. In waters with salinities less than 2.5 PSU, the mean bacterial abundance values were 254 × 10³, (2741 ± 394) × 10³, and (2069 ± 185) × 10³ cells/mL in spring, summer, and fall, respectively. At salinities greater than 18 PSU, the bacterial abundance in the same seasons was (196 ± 50) × 10³, (683 ± 184) × 10³, and (125 ± 24) × 10³ cells/mL, respectively. Similar patterns were observed in the biomass distribution. Production and activity characteristics were unstable, with maximum values observed in the summer period. Within the zones identified by salinity indices, the distribution of bacterial abundance was apparently associated with small-scale patchiness in the distribution of organic matter, phytoplankton, and SPM. The contribution of the heterotrophic component of the microbial community was dominant in early spring. Despite the observed correlations between bacterial abundance and activity, phytoplankton, and organic carbon, their distribution patterns differed along the salinity gradient.

中文翻译：

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叶尼塞河口浮游细菌的季节性变化

摘要—

在叶尼塞河口地区不同季节收集的材料以及以前发表的数据，用于分析微生物群落的季节性变化的规模和模式。在所有有关季节中，根据盐度值可以在河口地区区分三个区域。这些区域中浮游细菌的丰度和活性变化一个数量级。在盐度小于2.5 PSU的水中，春季，夏季和秋季的平均细菌丰度值分别为254×10 ³，（2741±394）×10 ³和（2069±185）×10 ^3个细胞/ mL。 。在盐度大于18 PSU时，同一季节的细菌丰度为（196±50）×10 ³，（683±184）×10³和（125±24）×10 ³细胞/ mL。在生物量分布中观察到相似的模式。生产和活动特性不稳定，在夏季观察到最大值。在由盐度指数确定的区域内，细菌丰度的分布显然与有机物，浮游植物和SPM分布中的小规模斑块有关。早春，微生物群落的异养成分贡献显着。尽管观察到细菌丰度与活性，浮游植物和有机碳之间的相关性，但它们的分布模式沿盐度梯度不同。