Journal of Oceanography

, Volume 54, Issue 5, pp 545–552

Photosynthesis-irradiance relationship of phytoplankton and primary production in the vicinity of Kuroshio warm core ring in spring

  • Ken Furuya
  • Osamu Hasegawa
  • Takashi Yoshikawa
  • Satoru Taguchi
Article

DOI: 10.1007/BF02742456

Cite this article as:
Furuya, K., Hasegawa, O., Yoshikawa, T. et al. J Oceanogr (1998) 54: 545. doi:10.1007/BF02742456
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Abstract

The light-saturated maximum value (PBmax) and initial slope (α) of the photosynthesis-irradiance (P-E) curve were examined in a warm streamer, a cold streamer and a warm core ring off the Sanriku area in the subarctic western North Pacific Ocean during an ADEOS/OCTS Sanriku field campaign in early May 1997. BothPBmax and α were within the ranges of temperate populations. A regional difference was apparent inPBmax: populations in the warm streamer tended to show higher value ranging between 1.92 and 4.74 mgC (mgChla)−1h−1 than those in the cold streamer and the warm core ring (1.35–2.87 mgC (mgChla)−1h−1). A depth variation was also observed in α in both the warm streamer and the warm core ring: shallow populations tended to have lower α than deep populations. The depth variations in bothPBmax and α resulted in a lower light intensity of the light saturation in a deeper population than that of a shallower one. These depth-related variations in the P-E parameters were likely a manifestation of “shade-adaptation” of photosynthesis. Photoinhibition was not observed over in situ surface light intensity varying below ca 1600 μmol photon m−2s−1. Water-column primary productivity was biooptically estimated to be 233 to 949 mgC m−2d−1 using vertical distributions of the P-E parameters, chlorophylla, phytoplankton light absorption and underwater irradiance. Applicability of surface data sets for estimation of water-column productivity is discussed.

Keywords

Photosynthesis primary production phytoplankton P-E curve subarctic Pacific warm core ring ADEOS/OCTS 

Copyright information

© The Oceanographic Society of Japan 1998

Authors and Affiliations

  • Ken Furuya
    • 1
  • Osamu Hasegawa
    • 1
  • Takashi Yoshikawa
    • 1
  • Satoru Taguchi
    • 2
  1. 1.Department of Aquatic Bioscience, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan
  2. 2.Faculty of EngineeringSoka UniversityTokyoJapan

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