ISSN:
1608-3237
Keywords:
microbial processes
;
microbial count
;
carbon cycle
;
methane oxidation
;
sulfate reduction
;
Barents Sea
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The total number of microorganisms and rates of microbial processes of the carbon cycle were determined in snow, sea ice, water, and seafloor sediments of the northern part of the Barents Sea from September to October, 1998. The explorations were carried out in two areas: along the transection from Franz Josef Land to Victoria Island and along the continental slope region covered with solid ice at latitude 81°–82° N and longitude 37°–39° E. At the time of study, the ice cover was represented by thick one-year old ice (up to 1.2 m), perennial ice (up to 1.85 m), and pack ice. The number of bacteria in the snow cover, sea ice, and seawater was 12 to 14, 50 to 110, and 10 to 240 × 103 cells/ml, respectively. Rates of dark CO2 assimilation, glucose utilization, and methane oxidation by bacteria were determined. The highest rate of microbial processes was found in samples of the lowermost newly formed sea ice. The lowest level of activity for all processes was observed in melted snow water. A direct relation was shown between the concentration of Corg, the bacterial biomass, and the values of δ13Corg in mixtures of melted snow and ice. The number of microorganisms and rates of microbial processes in seafloor sediments measured at the stations on the continental slope are comparable to those in the central part of the Barents Sea and the northern part of the Kara Sea.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026614510196
Permalink
