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Nutrient-sufficient cultures of 10 arctic diatom species were grown at a combination of 9 irradiances and 4 day lengths at 0 . 5 'C. The growth rate was calculated on the basis of in vivo fluorescence measurements. Maximum recorded growth rates ranged from 0.41 d-' (Amphiprora sp.) to 0.60 d-' (Thalassiosira antarctica and T. bulbosa). Growth rates generally increased with irradiance up to 50 or 70 pm01 rn-2s-', above which they depended mainly on day length. The day length response of light-saturated cultures was satisfactorily described by a rectangular hyperbola.

Growth rates of ten diatom species from the Barents Sea at different irradiances and day lengths