摘要
Abundance and biomass of heterotrophic microbes were investigated usingepifluorescense microscopy in August 2004 along a transect in the Kongsfjorden, a glacial fjord inthe high arctic, located in the north-western part of Svalbard. A bacterial abundance was low atouter fjord stations (on average 2.29 x 10~8 ind./dm^3) and was higher at inner fjord stations (onaverage 3.52 x 10~8 ind./dm^3).The biomass of bacteria ranged from 3.69 to 8.01 mg/m^3.The abundanceof bacteria was low at the surface of water(0 m), whereas the higher abundances often occurred atdepths of 30～50 m.The abundance of heterotrophic flagellates varied from 2.785 to 8.891 x 10~4 ind./dm^3. The assemblage was numerically dominated by less than 5 μm heterotrophic flagellates(78.67%～94.80%).The biomass of heterotrophic flagellates varied from 0.37 to 2.30 mg/m^3.The meanbiomass distribution for all stations was 4.91% for less than 5 μm heterotrophic flagellates,86.74% for 6～20 μm flagellates and 8.35% for greater than 20 μm sized flagellates.The low biomassof heterotrophic flagellates often occurred at the surface of water (0 m),while the maximum valueof biomass occurred at different depths. The biomass of total heterotrophic microbial communityranged from 4.20 to 10.03 mg/m^3.The mean biomass distribution for all stations was 82.58% forbacteria, 15.77% for flagellates and 1.66% for ciliates.
Abundance and biomass of heterotrophic microbes were investigated usingepifluorescense microscopy in August 2004 along a transect in the Kongsfjorden, a glacial fjord inthe high arctic, located in the north-western part of Svalbard. A bacterial abundance was low atouter fjord stations (on average 2.29 x 10~8 ind./dm^3) and was higher at inner fjord stations (onaverage 3.52 x 10~8 ind./dm^3).The biomass of bacteria ranged from 3.69 to 8.01 mg/m^3.The abundanceof bacteria was low at the surface of water(0 m), whereas the higher abundances often occurred atdepths of 30～50 m.The abundance of heterotrophic flagellates varied from 2.785 to 8.891 x 10~4 ind./dm^3. The assemblage was numerically dominated by less than 5 μm heterotrophic flagellates(78.67%～94.80%).The biomass of heterotrophic flagellates varied from 0.37 to 2.30 mg/m^3.The meanbiomass distribution for all stations was 4.91% for less than 5 μm heterotrophic flagellates,86.74% for 6～20 μm flagellates and 8.35% for greater than 20 μm sized flagellates.The low biomassof heterotrophic flagellates often occurred at the surface of water (0 m),while the maximum valueof biomass occurred at different depths. The biomass of total heterotrophic microbial communityranged from 4.20 to 10.03 mg/m^3.The mean biomass distribution for all stations was 82.58% forbacteria, 15.77% for flagellates and 1.66% for ciliates.
基金
supported by the National Natural Science Foundation of China under contract Nos 40576002,40006010 and 30270112
the Polar Research Institute of China Innovation Founda-tion of Polar Science for Young Scientists under con-tract No.JDQ200502
the Basic Research Project of Ministry of Scienle and Technology of China under contract No.2003DEB5J057
the Oceanic Science Foundation of State Oceanic Administration under contract No.2003122.
