Perennial antarctic lake ice: An oasis for life in a polar desert

Science

Volumn 280, Issue 5372, 1998, Pages 2095-2098

  Priscu, John C ^a   Fritsen, Christian H ^a   Adams, Edward E ^b   Giovannoni, Stephen J ^c   Paerl, Hans W ^d   McKay, Christopher P ^e   Doran, Peter T ^f   Gordon, Douglas A ^c   Lanoil, Brian D ^c   Pinckney, James L ^d  

^a MONTANA STATE UNIVERSITY   (United States)

^b Montana State University   (United States)

^c OREGON STATE UNIVERSITY   (United States)

^d UNIVERSITY OF NORTH CAROLINA   (United States)

^e NASA AMES RESEARCH CENTER   (United States)

^f UNIVERSITY OF ILLINOIS AT CHICAGO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ICE COVER; LAKE; MICROBIAL COMMUNITY; POLAR REGION;

ANTARCTICA; DECOMPOSITION; LAKE; LIFE; MICROBIAL GROWTH; NITROGEN FIXATION; NONHUMAN; PHOTOSYNTHESIS; PRIORITY JOURNAL; REVIEW; SEDIMENT;

NASA CENTER ARC; NASA DISCIPLINE EXOBIOLOGY;

ANTARCTIC REGIONS; BACTERIA; CARBON; CARBON DIOXIDE; CYANOBACTERIA; ECOSYSTEM; EXOBIOLOGY; GEOLOGIC SEDIMENTS; ICE; JUPITER; MARS; NITROGEN FIXATION; PHOTOSYNTHESIS; PHYLOGENY; RNA, BACTERIAL; RNA, RIBOSOMAL, 16S; WATER MICROBIOLOGY;

ANTARCTICA, MCMURDO DRY VALLEY;

EID: 0032569044     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5372.2095     Document Type: Review

References (28)

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4. -1 before filtration through Whatman GF/F filters. The activity on the filters, together with DIC concentration, obtained from infrared analysis of gas-sparged samples, was used to compute photosynthetic rates. Samples for bacterial activity were incubated with 20 nM thymidine for 20 hours at 1°C in the dark followed by the addition of cold trichloroacetic acid (5% final concentration); samples were filtered on 0.2-μm filters for determination of isotopic incorporation.
5. -1 before filtration through Whatman GF/F filters. The activity on the filters, together with DIC concentration, obtained from infrared analysis of gas-sparged samples, was used to compute photosynthetic rates. Samples for bacterial activity were incubated with 20 nM thymidine for 20 hours at 1°C in the dark followed by the addition of cold trichloroacetic acid (5% final concentration); samples were filtered on 0.2-μm filters for determination of isotopic incorporation.
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9. The vertical offset between microbial biomass and activity maxima in Fig. 1, C and D, reflects variation between core samples and core length used for the analyses (14-cm core sections were used for data in Fig. 1, A to C; 30-cm sections were used for data in Fig. 1D). Because sediment aggregates occurred in relatively compact layers, rates would be higher if measured on shorter core sections incorporating the sediment layer only.
10. -1.
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28. We thank T. Meuwissen for field assistance. Supported by the NSF (OPP 94-19423 and OPP 92-11773).