The influence of irradiance on growth, photosynthesis and respiration of Gyrodinium cf. aureolum |
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Authors: | Garcia, V.M.T. Purdie, D.A. |
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Affiliation: | 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 96200Rio GrandeRS, Brazil |
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Abstract: | The bloom-forming marine dinoflagellate Gyrodinium cf. aureolumwas grown in batch cultures over a range of irradiances (35380µmolm2 s1 and growth, photosynthesis and respirationrates determined. Saturation of growth occurred at irradiancesof 100µmol m2 s1 Below this light level,decreases in growth rates and cell size, and a relative increasein carbon specific respiration rates, were observed. On theother hand, photosynthesis-irradiance relationships determinedfrom dissolved oxygen incubations showed that on a cellularand carbon basis, cultures grown at low irradiances had higherrates of light-limited and light-saturated photosynthesis, mainlyas a result of large increases in cell chlorophyll content.This adaptation strategy enables low-light-grown organisms toexploit available high irradiance through a relatively highphotosynthetic capacity. In cells grown at higher light levels(>100µmol m2 s1), excess photosynthatemay be diverted to storage rather than used for growth. |
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