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• W2005772847 abstract "Community metabolism (respiration and production) and bacterial activity were assessed in the upper water column of the central Arctic Ocean during the SHEBA/JOIS ice camp experiment, October 1997–September 1998. In the upper 50 m, decrease in integrated dissolved oxygen (DO) stocks over a period of 124 d in mid-winter suggested a respiration rate of ∼3.3 nM O2 h−1 and a carbon demand of ∼4.5 gC m−2. Increase in 0–50 m integrated stocks of DO during summer implied a net community production of ∼20 gC m−2. Community respiration rates were directly measured via rate of decrease in DO in whole seawater during 72-h dark incubation experiments. Incubation-based respiration rates were on average 3-fold lower during winter (11.0±10.6 nM O2 h−1) compared to summer (35.3±24.8 nM O2 h−1). Bacterial heterotrophic activity responded strongly, without noticeable lag, to phytoplankton growth. Rate of leucine incorporation by bacteria (a proxy for protein synthesis and cell growth) increased ∼10-fold, and the cell-specific rate of leucine incorporation ∼5-fold, from winter to summer. Rates of production of bacterial biomass in the upper 50 m were, however, low compared to other oceanic regions, averaging 0.52±0.47 ngC l−1 h−1 during winter and 5.1±3.1 ngC l−1 h−1 during summer. Total carbon demand based on respiration experiments averaged 2.4±2.3 mgC m−3 d−1 in winter and 7.8±5.5 mgC m−3 d−1 in summer. Estimated bacterial carbon demand based on bacterial productivity and an assumed 10% gross growth efficiency was much lower, averaging about 0.12±0.12 mgC m−3 d−1 in winter and 1.3±0.7 mgC m−3 d−1 in summer. Our estimates of bacterial activity during summer were an order of magnitude less than rates reported from a summer 1994 study in the central Arctic Ocean, implying significant inter-annual variability of microbial processes in this region." @default.
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• W2005772847 date "2003-04-01" @default.
• W2005772847 modified "2023-10-14" @default.
• W2005772847 title "Community respiration/production and bacterial activity in the upper water column of the central Arctic Ocean" @default.
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• W2005772847 doi "https://doi.org/10.1016/s0967-0637(03)00030-x" @default.
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