Response of an Antarctic Lake Heterotrophic Community to High Dissolved Oxygen
AUTOR(ES)
Mikell, Alfred T.
RESUMO
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-14C]glucose assimilated-respired. High dissolved oxygen was not inhibitory to d-[U-14C]glucose assimilation-respiration compared with normal atmospheric dissolved oxygen in Lake Hoare water. The d-[U-14C]glucose was assimilated and respired optimally at 12°C in Lake Hoare. The d-[U-14C]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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=240055Documentos Relacionados
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