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Abstract
This work deals with ecological studies on Azolla pinnata naturally growing in two different habitats at Sharkia Province (namely irrigation habitat at Hehiya and drainage habitat at Abu – Hammad )
Azolla pinnata belongs to family Azollaceae and invades drainage and irrigation canals .
The study included the analysis of water of the two habitats supporting A. pinnata and chemical composition of this plant . The latter includes , precentage of ash , chlorophyll content , carbohydrate content , sugars , lipid content , nitrogen content organic acids and amino acids were carried out on the Azolla pinnata . Toxicities of the different extracts against the 3rd larval instar of Culex pipiens and antimicrobial activity of this plant were investigated .
The effect of different concentrations Of salinity and Niclosamid (bilocide ) on the growth , chlorophyll content and total nitrogen of A. pinnata were also studied .
Floristic composition of the plant community type was carried out in the two habitats .