Effects of temperature elevation and glucose addition on prokaryotic production and respiration in the mesopelagic layer of the western North Pacific
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- Uchimiya, M., Ogawa, H. & Nagata, T. J Oceanogr (2016) 72: 419. doi:10.1007/s10872-015-0294-4
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Incubation experiments were conducted to determine whether, and to what extent, heterotrophic prokaryotic production (HPP), prokaryotic respiration (PR), and prokaryotic growth efficiency (PGE) vary in response to the addition of dissolved organic carbon (DOC; glucose at a final concentration of 0.5 µmol C L−1) and elevation of water temperature (+5 °C) in the upper mesopelagic layer of the subarctic and subtropical western North Pacific. The addition of DOC or temperature elevation generally enhanced HPP and PR. Synergistic effects of water temperature and DOC were also found, suggesting that prokaryotic consumption of DOC in the mesopelagic layer is partly regulated by water temperature. Despite the large variability in HPP and PR, PGE varied only moderately, yielding an average value of 0.066 (standard deviation = 0.027, n = 8).