Photosynthesis and primary production of Microcystis aeruginosa Kütz. in Lake Kasumigaura

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Abstract
Seasonal changes in the photosynthesis and primary production of Microcystis aeruginosa Kütz. were investigated in Lake Kasumigaura during 1981–1982. Microcystis always showed a light-saturated photosynthesis-light curve. Both Pmax and the initial slope of the photosynthesis-light curve of Microcystis in early summer were very high, so it was concluded that Microcystis utilized both low and high light intensities efficiently. The Pmax of Microcystis was found to be a function of the water temperature except in August and September. The linear regression on the temperature-Pmax relationship discontinued at 11°C, where the Pmax value dropped; Microcystis did not photosynthesize below 4°C. The initial slope of the curve was also descending below 11°C. It is suggested that Microcystis changes its physiological properties below 11°C. The highest value of gross production calculated for M. aeruginosa was 5.4 gC m−2 d−1 in July; the annual gross production was estimated to be 300 gC m−2year−1 (i.e., 40% of the total primary production in this lake).

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