Effect of salinity, light intensity and nitrogen source on growth and composition of Ulva fasciata Delile (Chlorophyta, Ulvales)

摘要

Effect of two levels (low and high) of salinity (20 and 35 ppt), light intensity (26 and 72 mu E-a m(-2) s(-1).) and nitrogen source (as nitrate and ammonia) on growth rates, chlorophyll a and b, carotenoids, protein, carbohydrate and lipid composition of Ulva fasciata were studied in a 3x2 factorial laboratory experiment. Specific growth rate (SGR) was maximum at high light intensity and high salinity. Low light intensity and high salinity enhance the accumulation of pigments, protein, carbohydrate and lipid contents; Ammonium in the form of NH4SO4 is relatively better nitrogen source for maximum growth and biochemical composition of Ulva fasciata.