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http://dx.doi.org/10.5322/JES.2006.15.8.727

Evaluation of the ETRmax in Microalgae Using the PHYTO-PAM Fluorometer  

Cho, Eun-Seob (South Sea Fisheries Research Institute, NFRDI)
Lee, Pil-Yong (South Sea Fisheries Research Institute, NFRDI)
Oh, Hyun-Ju (South Sea Fisheries Research Institute, NFRDI)
Choi, Yoon-Seok (South Sea Fisheries Research Institute, NFRDI)
Choi, Yang-Ho (South Sea Fisheries Research Institute, NFRDI)
Lee, Sam-Geun (South Sea Fisheries Research Institute, NFRDI)
Publication Information
Journal of Environmental Science International / v.15, no.8, 2006 , pp. 727-735 More about this Journal
Abstract
In this study, the PHYTO-PAM-fluorometric method was used to evaluate the ETR$_{max}$ in terms of sensitivity to DIN/DIP against 14 microalgae: Prorocentrum micans, Heterocapsa triquetra, Gymnodinium impudicum, Cymnodinium catenatum, Amphidinium caterae, Chlorella vulgaris, Chroococcus minutus, Microcystis aeruginosa, Chlorella ellipsoidea, Nannochloris oculata, Oocystis lacustris, Chroomonas salina, Gloeocystis gigas, and Prymnessium parvum. We found that P. micans, H. triquetra, and A. caterae exposed to the maximum level of DIN/DIP were significantly smaller in the ETR$_{max}$ than that of the minimum and moderate mixture. Unlikely the ETR$_{max}$, the initial slope alpha was not significantly different at the level of 60 DIN/DIP. In G. catenatum, the moderate levels of 15 and 20 in DIN/DIP were found to be significantly different from the ETR$_{max}$ at Chl-Ch4. Gymnodinium impudicum had a higher value than that of the ETR$_{max}$ than that of dinoflagellates used in this study, ranging from 306.1 (Ch4, DIN/DIP: 10) to 520.1 (Ch4, DIN/DIP: 30). The ETR$_{max}$ value obtained from other microalgae was similar to C. impudicum at any of the ratios of DIN/DIP and channels. Consequently, the influence of offshore water current assures us of the suppression of photosynthesis and electron transport rate in dinoflagellates. Gymnodinium impudicum has not been researched in the area of red tides in Korea, but it will be enough to creat the massive algal blooms in the future because of higher potential photochemical availability.
Keywords
PHYTO-PAM fluorometer; $ETR_{max}$; Microalgae; Photochemical efficiency; DIN/DIP; Photosynthesis;
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