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Recent dynamics of bacterioplankton in Lake Ladoga

Recent dynamics of bacterioplankton in Lake Ladoga

Boreal Environment Research 4(3): 263-267

New data are presented on the dynamics of total bacterioplankton numbers (BN) and dark CO2-fixation (DCF) in 1989-1993. During this period, both BN and DCF have been much higher than in the preceding years. Summer averages of DCF and BN for the period 1985-1988 were 0.49 mug C l-1 d-1 and 0.54 X 106 cells ml-1, and for 1989-1993 they were 2.4 mug C l-1 d-1 and 1.02 X 106 cells ml-1, respectively. The summer 1992 averages of BN, 2.26 X 106 cells ml-1 in epilimnion and 1.16 X 106 cells ml-1 in hypolimnion are the highest values recorded since the beginning of bacterioplankton investigations in Lake Ladoga in 1977. The increase of DCF and BN has been accompanied with a considerable decrease (from 9 down to 6.3-8.3 mg l-1) of total organic carbon levels in Lake Ladoga.

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