โ Scribed by Ahmed M. Ahmed; Medhat M. Haikal; Ahmed A. Mohammed; Mohammed A. Zidan
No coin nor oath required. For personal study only.
Monthly variations of some physical and chemical characteristics of Sile waters at Assiut (373 km south from Cairo, Egypt) during the period from September 1980 to September 1982 were followed and discudsed. As expected, the maximum temperature was recorded in summer and the minimum in winter. The pH values of Xile waters were recorded to be in the vicinit,y of 8.0. The highest, oxygen concentrations were recorded in the summer mont,hs, mainly due to the relatively high photosynthetic activity. The total soluble salts and the t,otal alkalinity exhibited almost identical t.rends. Nitrate, phosphate, silicate and chloride concentrations showed no major regular trends. The cation abundances by weight were as follows: Ca?+ > S a + zMgZ+>K+.
๐ SIMILAR VOLUMES
## Seasonal. local and monthly vertical variations in physical and chemical characteristics of Aswan High Dam Lake (AHDL) were followed during the period from March 1982 to February 1984 . The results show that there were distinct seasonal thermal variations . Similarly. thermal stratification was
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key ccrorda: benthic invertebratea, sandy beaches, Gulf of Aqaba, Red See, community Six sandy beach stations along the Jordan Gulf of Aqaba were selected for macrofaunal examination during November 1980. Fifteen core samples (0.01 mz to a depth of 10-15 cm) were taken at each station; five a t the