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Nitrogen Cycling in the Barents Sea-Seasonal Dynamics of New and Regenerated Production in the Marginal Ice Zone

Svein Kristiansen, Tove Farbrot and Patricia A. Wheeler
Limnology and Oceanography
Vol. 39, No. 7 (Nov., 1994), pp. 1630-1642
Stable URL: http://www.jstor.org/stable/2838199
Page Count: 13
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Nitrogen Cycling in the Barents Sea-Seasonal Dynamics of New and Regenerated Production in the Marginal Ice Zone
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Abstract

The uptake rates of nitrate, ammonium, and urea were measured with a $^15 N$ technique during seven cruises in the marginal ice zone (MIZ) in the Barents Sea in 1984-1988. The results from all the cruises were pooled to obtain means for the prebloom, bloom, transition, and postbloom periods. New production-nitrate uptake as percent of total uptake-was high (92-96%) during the prebloom and bloom periods and decreased thereafter. Regenerated production-summed ammonium + urea uptake as percent of total uptake-increased through the bloom cycle and was at its maximum (95-93%) during the post-bloom period. New production (as percent of the total) was higher in the ice-filled parts than in the ice-free parts, especially during the postbloom period. Nitrate uptake rates, however, were highest $(9-25 nM h^-1)$ in open and ice-free parts during the bloom and transition period. Mean growth rate of phytoplankton-nitrogen was 0.5 doubling $d^-1$ during the bloom and ranged from 0.3 to 0.4 doubling $d^-1$ after the bloom. We hypothesize that primary production in the MIZ is not nutrient limited but is proportional to phytoplankton standing stocks.

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