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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 9 | PAGES 1251-1265 | 1992
© Oxford University Press

research-article

The influence of irradiance on growth, photosynthesis and respiration of Gyrodinium cf. aureolum

V.M.T. Garcia1 and D.A. Purdie

Marine Microbiology Group, Department of Oceanography, The University Southampton S09 5NH, UK 1Present address: Laboratório de Fitoplâncton, Departamento de Oceanografia, Fundação Universidade do Rio Grande 96200—Rio Grande—RS, Brazil

Received on February 2, 1991; accepted on April 2, 1992 The bloom-forming marine dinoflagellate Gyrodinium cf. aureolum was grown in batch cultures over a range of irradiances (35–380µmol m–2 s–1 and growth, photosynthesis and respiration rates determined. Saturation of growth occurred at irradiances of ~100µmol m–2 s–1 Below this light level, decreases in growth rates and cell size, and a relative increase in carbon specific respiration rates, were observed. On the other hand, photosynthesis-irradiance relationships determined from dissolved oxygen incubations showed that on a cellular and carbon basis, cultures grown at low irradiances had higher rates of light-limited and light-saturated photosynthesis, mainly as a result of large increases in cell chlorophyll content. This adaptation strategy enables low-light-grown organisms to exploit available high irradiance through a relatively high photosynthetic capacity. In cells grown at higher light levels (>100µmol m–2 s–1), excess photosynthate may be diverted to storage rather than used for growth.


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