Response of an Antarctic Lake Heterotrophic Community to High Dissolved Oxygen

The upper waters of Lake Hoare, Antarctica, contain dissolved oxygen at about three times the normal saturation (≥42 mg liter −1 ). The response of the heterotrophic plankton community to this high dissolved oxygen was evaluated by the criteria of CFU and d -[ U - 14 C]glucose assimilated-respired....

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Bibliographic Details
Published in:Applied and Environmental Microbiology
Main Authors: Mikell, Alfred T., Parker, Bruce C., Simmons, George M.
Format: Article in Journal/Newspaper
Language:English
Published: American Society for Microbiology 1984
Subjects:
Ecology
Applied Microbiology and Biotechnology
Food Science
Biotechnology
Antarctic
Hoare
Hoare Lake
Lake Hoare
Antarc*
Antarctica
Online Access:http://dx.doi.org/10.1128/aem.47.5.1062-1066.1984
https://journals.asm.org/doi/pdf/10.1128/aem.47.5.1062-1066.1984
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Summary:The upper waters of Lake Hoare, Antarctica, contain dissolved oxygen at about three times the normal saturation (≥42 mg liter −1 ). The response of the heterotrophic plankton community to this high dissolved oxygen was evaluated by the criteria of CFU and d -[ U - 14 C]glucose assimilated-respired. High dissolved oxygen was not inhibitory to d -[ U - 14 C]glucose assimilation-respiration compared with normal atmospheric dissolved oxygen in Lake Hoare water. The d -[ U - 14 C]glucose was assimilated and respired optimally at 12°C in Lake Hoare. The d -[ U - 14 C]glucose assimilated-respired in the upper saturated atmospheric dissolved oxygen waters of Mountain Lake, Va., was inhibited in contrast to Lake Hoare ( P < 0.05). CFU formation was inhibited in both lakes. CFU represent <1% of the fluorochrome-stained direct counts in Lake Hoare. Lake Hoare planktobacteria are smaller than the planktobacteria in Mountain Lake. ATP size fractionation revealed that 39% of the ATP biomass was <0.5 μm in Lake Hoare.

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