Bacterial dynamics in two high‐arctic lakes
Summary The heterotrophic planktonic bacteria in two high‐arctic lakes were studied by direct microscope count and the enzymatic uptake of 14 C labelled glucose which generally conformed to Michaelis‐Menten kinetics. Bacterial numbers and activity in oligo‐trophic Char Lake ranged from 0.1 to 2.0×10...
| Published in: | Freshwater Biology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1972
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/j.1365-2427.1972.tb00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2427.1972.tb00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2427.1972.tb00050.x |
| Summary: | Summary The heterotrophic planktonic bacteria in two high‐arctic lakes were studied by direct microscope count and the enzymatic uptake of 14 C labelled glucose which generally conformed to Michaelis‐Menten kinetics. Bacterial numbers and activity in oligo‐trophic Char Lake ranged from 0.1 to 2.0×10 −3 bacteria/l and a maximum uptake velocity (V max ) of 1.8 × 10 −3 μg glucose l − h −1 . Nearby Meretta Lake received waste water from the Department of Transport Base at Resolute and this eutrophication was reflected in higher bacterial numbers of 2‐80 × 10 8 /1 and Kmax of 0.1 × 10 −1 ‐7.5 × 10 −1 fig glucose l −1 h −1 The Kmax per cell in Char Lake was 3 × 10 −11 μg glucose l −1 h −1 and changed little between the period of solid ice cover in May and ice‐free conditions in August. Bacterial cycles could not be related to phytoplankton cycles in either lake. Comparison of kinetic data from several lakes suggests a relationship between the bacterial uptake rate of glucose and phytoplankton production. Both bacterial numbers and activity in Char Lake may be very close to the minima to be expected in undisturbed freshwater environments. |
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