Spatial and temporal dynamics of a metalimnetic Cryptomonas peak
- 1 January 1992
- journal article
- Published by Oxford University Press (OUP) in Journal of Plankton Research
- Vol. 14 (11) , 1565-1579
- https://doi.org/10.1093/plankt/14.11.1565
Abstract
For Gyrodinium aureolum significant irradiance and daylength effects were found on the division rate and on the growth-relevant Chla-normalized photosynthetic rate (gPB). Optimum conditions of irradiance and daylength were found at 230 μmol m−2 s−1 and 14 h for the division rate, and at >260 μmol m−2 s−1 and gPB.gPB showed no photoinhibition, while the division rate decreased markedly at irradiances above saturation. This difference and the difference in optimum irradiance between the division rate and gPB are explained by a decrease in cellular Chla/carbon ratio with increasing irradiance. The cellular content of carbon and nitrogen decreased significantly with increasing irradiance. Total phosphorus was independent of irradiance and daylength. Below the saturation irradiance for gPB the daily Chla-normalized carbon yield may be described as an exponential function of the daily irradiance (irradiance × daylength).Keywords
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