Abstract
LakeQarun is an inland lake occupies the lowest part of El- Fayoum depression. Thesampling program during the studied period was carried out on monthly basisfrom May 2015 and continued till April 2016 (12 successive months).Physico-chemical analysis of Qarun Lake revealed that pH values recorded wereon the alkaline side, values of Secchi disc indicated that the water of thelake concerned as a turbid water bodies. The alkalinity in Qarun Lake ischaracterized by increasing of bicarbonate values as compared with carbonateone. Nutrients analysis indicated increasing of ammonium, nitrate, nitrite,phosphate, silicate in the water of the lake especially in front of the drains.On the other hand a total of 89 species of phytoplankton belonging to sixclasses were recorded in the lake. The recorded classes were Bacillariophyceae,Cyanophyceae, Chlorophyceae, Euglenophyceae, Dinophyceae and Cryptophyceae,.TheBacillariophyceae were most diverse with 39 species, then Cyanophyceae with 18species, Chlorophyceae and Euglenophyceae with 10 species for both, Dinophyceaewith 9 species and Cryptophyceae with 3 species. Our study concluded that theincreased nutrient level in the lake by time show an exacerbated problem ofeutrophication which lead to economic effect on fish production
Highlights
Qarun Lake is the only enclosed saline lake in Egypt
Four sampling stations were selected to cover the main difference in water quality of the lake that affected by the agriculture drainage water from El Bats at the east and El-Wadi drains at the middle of the lake (Figure1)
The lower Secchi disc readings may be attributed to higher primary productivity (Saeed and Mohammed, 2012), this data was confirmed by strong negative correlations with total phytoplankton at the NIOF and the east stations (r = - 0.677* and 0.667* respectively).The electrical conductivity line showed a relative approximation to the total dissolved solids line and their values were 35.1- 44.7 ms cm-1 and 20.7 - 28.6 g l-1 respectively
Summary
Studying of Physico-chemical and Biological characters of Qarun Lake, ElFayoum – Egypt. 1- Department of Botany, Faculty of Science, Damnhour University, Egypt. 2- National Institute of Oceanography and Fisheries (NIOF), Inland Water and Aquaculture Branch, 101 Kasr.
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