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Effects of Temperature, Light Intensity, Salinity and Source of Nitrogen on the Growth, Total Lipid and Fatty Acid Composition of Ulva pertusa Kjellman (Chlorophyta)

Growth, total lipid content and fatty acid composition of Ulva pertusa Kjellman were studied in a 4 × 2 factorial laboratory experiment at two levels (low and high) of temperature (15 and 25 °C), subsaturating light intensities (16-32 and 48-64 μE m −2 s −1 ), salinity (20 and 35‰) and two sources of nitrogen (nitrate and ammonia). Specific growth rate (SGR) was highest at low temperature (15 °C), high light intensity (48-64 μE m −2 s −1 ) and high salinity (35‰). Interaction between temperature, light intensity and nitrogen source was the highest source of variation in SGR at the beginning of culture, while salinity and salinity-light intensity interactions were the most limiting factors during the later part of culture