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Primary production studies on a reservoir embalse del rio tercero argentina

, : Primary production studies on a reservoir embalse del rio tercero argentina. Memoirs of the Faculty of Science Kyoto University Series of Biology 10(1): 49-62

Diel and day-to-day variation in the amounts of chlorophyll a and phaeopigments and the daily primary production of phytoplankton were investigated for two or three consecutive days every month from March of 1980 to March of 1981 at a fixed station in a eutrophic reservoir in Argentina. The amount of chlorophyll a in the euphotic zone varied noticeably within a day or day by day from summer to autumn. It was suggested that the short-term variation in chlorophyll a was brought about by short-term displacement of water masses with different amounts of phytoplankton and was related closely to the variation in cell numbers of Peridinium gatunense. The day-to-day variation of daily primary production was remarkable during the period of summer-autumn. This variation was suggested to be caused by the noticeable change in phytoplankton standing crop during the investigated days. The recent trophic status of this lake was discussed with reference to some variables measured in 1971-1972.

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