Bacterioplankton dynamics in the McMurdo Dry Valley lakes, Antarctica: Production and biomass loss over four seasons

被引:74
作者
Takacs, CD [1 ]
Priscu, JC [1 ]
机构
[1] Montana State Univ, Dept Biol, Bozeman, MT 59717 USA
关键词
D O I
10.1007/s002489900111
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Research of the microbial ecology of McMurdo Dry Valley lakes has concentrated primarily on phototrophs; relatively little is known about the heterotrophic bacterioplankton. Bacteria represent a substantial proportion of water column biomass in these lakes, comprising 30 to 60% of total microplankton biomass. Bacterial production and cell numbers were measured 3 to 5 times, within four Antarctic seasons (October to January), in Lakes Fryxell, Hoare, and Bonney. The winter-spring transition (September to October) was included during one year. Lake Fryxell was the most productive, but variable, lake, followed by Lakes Bonney and Hoare. Bacterial production ranged from 0 to 0.009 mu g C ml(-1) d(-1); bacterial populations ranged from 3.2 x 10(4) to 4.4 x 10(7) cells ml(-1). Bacterial production was always greatest just below the ice cover at the beginning of the season. A second maximum developed just above the chemocline of all the lakes, as the season progressed. Total bacterioplankton biomass in the lakes decreased as much as 88% between successive sampling dates in the summer, as evidenced by areal integration of bacterial populations; the largest decreases in biomass typically occurred in mid-December. A forward difference model of bacterial loss in the trophogenic zone and the entire water column of these lakes showed that loss rates in the summer reached 6.3 x 10(14) cells m(-2) d(-1) and 4.16 x 10(12) cells m(-2) d(-1), respectively. These results imply that bacteria may be a source of carbon to higher trophic levels in these lakes, through grazing.
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页码:239 / 250
页数:12
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