Abstract

The spatial distribution and interannual dynamics of the abundance and biomass of heterotrophic bacterioplankton have been evaluated in two recently formed large freshwater reservoirs (the Taishir and Durgun reservoirs, the Great Lakes Depression, Western Mongolia). The total abundance of bacteria range from 2.5 × 10⁶ to 14.5 × 10⁶ cells/mL; biomass is from 45 to 386 mg C/m³. These parameters reach the level of eutrophic waters in both reservoirs, but they are on average 1.4 times higher in the Durgun reservoir. The bacterioplankton of the reservoirs is probably in the formation stage. Free-living cells are the basis of the number and biomass of bacterioplankton. They average 91.0% of the total biomass. The larger aggregated and filamentous bacteria contribute significantly less to the total biomass of the community—an average of 6.7 and 2.3%, respectively—and reach the highest abundance and biomass in the littoral zone of the reservoirs.

中文翻译：

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Taishir和Durgun水库（蒙古西部）中浮游细菌的空间分布和年际动态

摘要

已经在两个最近形成的大型淡水水库（Taishir和Durgun水库，蒙古西部大湖De陷）中评估了异养浮游植物的丰度和生物量的空间分布和年际动态。细菌的总丰度为2.5×10 ⁶至14.5×10 ^6个细胞/ mL。生物量为45至386 mg C / m ³。这些参数在两个水库中均达到富营养化水位，但在都根水库中平均高出1.4倍。储层的浮游细菌可能处于形成阶段。自由活动的细胞是浮游细菌数量和生物量的基础。它们平均占总生物量的91.0％。较大的聚集细菌和丝状细菌对群落总生物量的贡献显着降低（分别为6.7％和2.3％），并在水库沿岸带达到最高的丰度和生物量。