Current State of Heterotrophic Bacterioplanktonin the Kosinskie Lakesстатья
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Дата последнего поиска статьи во внешних источниках: 14 ноября 2016 г.
Аннотация:From December 2009 to December 2010, the total abundance of bacteria, the abundance of bacteria
with electron transport chain, the abundance of viable saprotrophic bacteria, and the concentration of chloro-
phyll a were studied in water samples from lakes Svyatoe, Beloe, and Chernoe in Kosino–Ukhtomskoe district,
Moscow City. The abundance of bacteria with active electron transport chain (CTC+bacteria) and its seasonal
variations in Kosinskie Lakes are studied for the first time. Those lakes were found to contain well-developed
and actively functioning heterotrophic bacterioplankton, the abundance of which have increased considerably
since the 1930s–1940s. The seasonal dynamics of bacterioplankton has also changed. The largest absolute
abundance of CTC+bacteria in lakes Svyatoe and Beloe was recorded in summer and autumn (from August to
November). The abundance peak of CTH+bacteria in Lake Svyatoe was recorded in September and that in Lake
Beloe, in October. The abundance of CTC+bacteria also showed a peak in April. In Lake Chernoe, the abun-
dance of CTC+bacteria was much less than in lakes Svyatoe and Beloe; its maximums were recorded in Decem-
ber 2009 and April 2010. The share of CTC+bacteria in the total abundance of bacteria was 2.4–19.2% in Lake
Svyatoe, 1.8–63.0% in Lake Beloe, and 0.96–22.5% in Lake Chernoe. Significant correlations were found to
exist in all three lakes between the abundance of active bacterioplankton fraction and chlorophyll a content of
water.