Seasonal variation in the essential micro-nutrients of Gracilaria spp. of Tamil Nadu coast

摘要: Essential micro-nutrients such as manganese, copper, lead and zinc were analysed in three species of Gracilaria for 12 months from August 1994 to July, 1995. Comparative data on the interspecific variation essential have been explained. Seasonal trace element within also analysed. Zinc content was found be maximum all Gracilaria. In general, decreasing trend Zn>Pb>Cu>Mn. Manganese copper comparatively higher G. edulis whereas dominated crassa. Seaweeds belonging red brown algae, addition being source several polysaccharides industrial importance, supplement human animal diets. At least 56 elements reported present seaweeds (Vinogradov, 1953) which, sodium, potassium, calcium, magnesium, sulfur phosphorus occur relatively high quantities are utilised directly or indirectly cellular building blocks (De Boer, 1981). Trace like very less considered proper growth plants. wonderful agents filtering heavy metals zinc, cadmium, nickel iron some potential carcinogens sea water They remove toxic materials environment accumulate body cell, which may 4,000-20,000 times more than surrounding