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JPR Advance Access published online on July 8, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn073
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Seasonal distribution of photosynthetically active phytoplankton using pulse amplitude modulated (PAM) fluorometry in the large monomictic Lake Biwa, Japan

Naoshige Goto1,*, Masaki Kihira1 and Noriko Ishida2

1 School of Environmental Science, The University of Shiga Prefecture, 2500 Hassaka-Cho, Hikone, Shiga 522-8533, Japan 2 Nagoya Woman's University, 1302 Takamiya-Cho, Tenpaku-Ku, Nagoya 468-0013, Japan

* Corresponding Author: gotonao{at}ses.usp.ac.jp

Received on March 30, 2008; revised on June 29, 2008; accepted on July 4, 2008


  Abstract

The detailed seasonal distribution of photosynthetically active phytoplankton was measured using the pulse amplitude modulated (PAM) fluorescence technique in the large monomictic Lake Biwa, Japan throughout the year. At the same time, the biological and physicochemical factors (water temperature, irradiance, nutrients, phytoplankton species) affecting the primary production of phytoplankton were also measured in order to estimate the relationship between the distribution of the active phytoplankton and environmental factors. The potential maximum quantum yield (Fv/Fm) of photosystem II was used as an index of the degree of potential photosynthetic competence of phytoplankton. As a result, the simultaneous measurement of Fv/Fm and algal biomass showed clearly the seasonal and spatial distribution patterns of the photosynthetically active phytoplankton community, and the distributions were strongly dependent on the seasonal variation in the thermally-stratified structure. In addition, the value of Fv/Fm in the euphotic zone was found to be influenced mainly by the irradiance and to be affected indirectly by nutrient concentration and the species composition of the phytoplankton community. Greater understanding of the detailed distribution of photosynthetically active phytoplankton coupled with their biomass will encourage new developments in studies of aquatic ecosystems.

Key Words: Photosynthetic competence • Pulse amplitude-modulated (PAM) fluorescence • Maximum quantum yield of PSII (Fv/Fm) • Active phytoplankton

Communicating Editor: Dr William Li


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