Estimation of Nitrogen Uptake Rate of Small Zooplankton Using 15N tracer.
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概要
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The uptake rate of nitrogen by freshwater zooplankton was measured by use of a <SUP>15</SUP>N tracer technique under experimental conditions. To detect the low quantities of excess <SUP>15</SUP>N in less than several hundreds of small zooplankton individuals (as small as 5 μgN), an isotope dilution technique was adopted using a ratio mass spectrometer. The analytical differences between natural <SUP>15</SUP>N abundance method and result obtained by this technique were -0.00210 to +0.00113 <SUP>15</SUP>N atom % (mean±S.D.=0.00048±0.0010 <SUP>15</SUP>N atom %) . We obtained uptake rates of 8.5×10<SUP>-8</SUP>mg atom-N⋅indiv.<SUP>-1</SUP>⋅day<SUP>-1</SUP> by Kellicottia longispina in Lake Nakatsuna and 4.2×10<SUP>-7</SUP> by Keratella quadrata in Lake Suwa. Net production rates calculated from the data of the uptake rates, carbon contents and nitrogen contents were 5.1×10<SUP>-6</SUP> mgC⋅indiv.<SUP>-1</SUP>⋅day<SUP>-1</SUP> for K. longispina and 2.5×10<SUP>-5</SUP> mgC⋅indiv.<SUP>-1</SUP>⋅day<SUP>-1</SUP> for K. quadrata. Using a combination of the ratio mass spectrometer and the <SUP>15</SUP>N tracer experiment, the nitrogen uptake rates from nutrient salt to phytoplankton and further to zooplankton can be detected directly at the same time and on the same space scale.
- 日本陸水学会の論文
日本陸水学会 | 論文
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