The rates of organic matter destruction in the central part of the Arctic Basin |
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Authors: | A I Agatova N M Lapina N I Torgunova |
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Institution: | 1.Russian Federal Research Institute of Fisheries and Oceanography,Moscow,Russia |
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Abstract: | The intensity of the processes of organic matter (OM) destruction in the deep-water part of the Arctic Basin is considered
in terms of the activities of hydrolytic enzymes (alkaline phosphatase and proteases) and of redox enzymes of the electron
transport system (ETS). High concentrations of mineral phosphorus are shown to cause low phosphatase activity (0.000–0.005
μM P/l h). The average time of the phosphate recycling amounted to about 240 h. The ranges of the total and specific activity
of protease are 0.000–0.192 mg of azocasein/(l h) and 0.00–3.57 mg of azocasein/h mg of protein, respectively. It is found
that the microplankton production of exo- and endopeptidase in the Arctic Basin is controlled by the concentration of nitrates
in the water. The values of the total and the specific activities of the ETS enzymes vary within 0.27–8.96 μl O2/(l h) and 8.4–583 μl O2/mg of protein h, respectively. It is shown that the maximum values of the total activities of the hydrolytic and redox enzymes
are characteristic for the photic layer. The vertical fluxes of organic carbon from the photic layer, being calculated by
the activity of the ETS enzymes, amounted to 220–600 g of Corg/year m2. The presence of ice intensifies the redox processes by factors of 2–15. |
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