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29 March 2024
 
  » pubmed » pmid17734142

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Occurrence and Metabolic Activity of Organisms Under the Ross Ice Shelf, Antarctica, at Station J9
F Azam ; J R Beers ; L Campbell ; A F Carlucci ; O Holm-Hansen ; F M H Reid ; D M Karl ;
Date 2 Feb 1979
Journal Science, 203 (4379), 451-453
AbstractSeawater 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 x 10(6) to 1.2 x 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.
Source PubMed, pmid17734142 doi: 10.1126/science.203.4379.451
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