Occurrence and Metabolic Activity of Organisms Under the Ross Ice Shelf, Antarctica, at Station J9

Seawater samples below the Ross Ice Shelf were collected through an access hole at J9, approximately 400 kilometers from the Ross Sea, Antarctica. The 237-meter water column had sparse populations of bacteria (8.7 × 10 6 to 1.2 × 10 7 per liter), microplankters (10 2 to 10 3 per cubic meter), and zo...

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Bibliographic Details
Published in:Science
Main Authors: Azam, F., Beers, J. R., Campbell, L., Carlucci, A. F., Holm-Hansen, O., Reid, F. M. H., Karl, D. M.
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 1979
Subjects:
Ross Ice Shelf
Ross Sea
Antarc*
Antarctica
Ice Shelf
Online Access:http://dx.doi.org/10.1126/science.203.4379.451
https://www.science.org/doi/pdf/10.1126/science.203.4379.451
Description
Summary:Seawater samples below the Ross Ice Shelf were collected through an access hole at J9, approximately 400 kilometers from the Ross Sea, Antarctica. The 237-meter water column had sparse populations of bacteria (8.7 × 10 6 to 1.2 × 10 7 per liter), microplankters (10 2 to 10 3 per cubic meter), and zooplankters (10 to 20 per cubic meter) at the depths studied. Microbial biomass estimates from cellular adenosine 5′-triphosphate measurements were very low (10 to 150 nanograms of carbon per liter), comparable with values for the abyssal ocean. Microbial populations assimilated tritiated D-glucose, thymidine, uridine, and adenosine triphosphate at extremely low rates, comparable with deep-sea heterotrophic populations. Sediment samples had 10 7 to 10 8 bacteria per gram (dry weight), which were metabolically active as shown by respiration of uniformly labeled D-[ 14 C]glucose. From this study it cannot be determined whether these organisms in the water column and sediments constitute a functioning food web.

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