Journal of Oceanography

, Volume 72, Issue 3, pp 419–426

Effects of temperature elevation and glucose addition on prokaryotic production and respiration in the mesopelagic layer of the western North Pacific

Special Section: Original Article K2S1 project

DOI: 10.1007/s10872-015-0294-4

Cite this article as:
Uchimiya, M., Ogawa, H. & Nagata, T. J Oceanogr (2016) 72: 419. doi:10.1007/s10872-015-0294-4

Abstract

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).

Keywords

Dissolved organic carbon Mesopelagic layer Prokaryotic growth efficiency Prokaryotic production Prokaryotic respiration Seawater temperature 

Funding information

Funder NameGrant NumberFunding Note
Japan Society for the Promotion of Science
  • KAKENHI 24241003
Japan Society for the Promotion of Science
  • JSPS Research Fellowship for Young Scientists

Copyright information

© The Oceanographic Society of Japan and Springer Japan 2015

Authors and Affiliations

  1. 1.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan
  2. 2.National Institute of Polar ResearchTachikawaJapan

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