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The chlorophyll amount in the euphotic zone in some Japanese lakes and its significance in the photosynthetic production of phytoplankton community


The chlorophyll amount in the euphotic zone in some Japanese lakes and its significance in the photosynthetic production of phytoplankton community



Bot Mag Tokyo 79(932/933): 77-78



DOI: 10.15281/jplantres1887.79.77

The variation of the amount of chlorophyll-a in the euphotic zone was studied in some lakes of central Japan with special reference to the effect of factors controlling it; also, the significance of the variation of chlorophyll amount in the photosynthetic production of the community was examined. The large chlorophyll-a amount of the euphotic zone could be found in shallower eutrophic lakes (maximum value was 106.0 mg/m2 in Lake Suwa), but not in deeper oligotrophic lakes (minimum was 10.5 mg/m2 in Lake Motosu). The depth of the euphotic zone was shallower in the former and deeper in the latter. A definite relation could not be found between the depth of the euphotic zone and the chlorophyll-a of the euphotic zone. The optical mass of pure water (gamma De), of phytoplankton (< Ae) and of the other substances (Se) throughout the whole euphotic zone was calculated and compared with each other. The smallest was ' Ae, the largest Se. It was concluded that the substances responsible for the variation of the Se value had the largest Influence on the attenuation of underwater light and therefore the depth of the euphotic zone. The relations of the chlorophyll amount of the euphotic zone (Ae) to Se values and to the mean chlorophyll concentration of the euphotic zone were examined. A clear relation could not be found between Ae and Se. Between Ae and the mean chlorophyll concentration, an approximate proportionality existed in waters of low chlorophyll concentration, but not in those of higher chlorophyll concentration. It was concluded that the difference in chlorophyll concentration had a great significance in the variation of Ae in oligotrophic lakes. The relation between the chlorophyll-a amount of the euphotic zone and the daily net production rate measured in situ was studied. An approximately linear relation could be found between these variables. The production rate of the community per unit chlorophyll-a amount varied with waters and seasons. The range of the variation in the production rate per unit chlorophyll-a amount was generally smaller than the range of the amount of chlorophyll-a in the euphotic zone.

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