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Changes in specific photosynthetic rate of oceanic phytoplankton from the northeast Pacific Ocean

  • M. J. Hameedi
General Aspects

Abstract

The study is based on data (n=244) from light-saturation experiments utilizing artificial incubation under fluorescent light. Values of maximum photosynthetic rate,Pmax, and the light intensity at which it takes place,Imax, are estimated by non-linear regression using stepwise Gauss-Newton iterations. Estimated values ofPmax ranged from 0.85 to 5.48 mg C (mg Chla·h)−1;Imax varied from 2.35 to 5.52 cal (cm2·h)−1. The effects of time (months) and depth (illumination levels) and their interaction are evaluated by analysis of covariance using a linear model. A significant time-depth interaction is noted: The maximum specific primary productivity occurred in the surface layers during March, at the 50% light level during April, and at 1% level during May. Estimates ofPmax from simulated in situ primary productivity experiments for the same period are lower than those from light-saturation experiments. A comparison of data from light-saturation and simulated in situ experiments indicated that effects of duration of experiments and the quality of available light may affect primary productivity data considerably.

Keywords

Waste Water Covariance Phytoplankton Pacific Ocean Photosynthetic Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Biologische Anstalt Helgoland 1977

Authors and Affiliations

  • M. J. Hameedi
    • 1
  1. 1.Department of OceanographyUniversity of WashingtonSeattleUSA

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