الفهرس 
Literature Review
Stations descriptionOnly 14 pages are availabe for public view
 |  | from | 192 |  |  |
| | | from | 192 | | |
Abstract
Water pollution is one of the environmental and public
health problems in Egypt. The impact of pollution on
macrobenthic invertebrates in five stations on the River Nile at
Greater Cairo (from Helwan to El-Qanater El-Khiria) was studied
during the period from May, 2013 to February, 2014. Physicochemical
water characteristics and some heavy metals in water
and sediments were analyzed. The highest average number (6915
org./m2) of macrobenthic invertebrates was recorded during
spring, while the lowest (1925 org./m2) was recorded during
summer. Annelida, Mollusca and Arthropoda were the most
dominant groups representing about 62 %, 34 % and 4 %
respectively. Twenty two species and taxa were recorded;
Mollusca (13 species), Annelida (7 species) and Arthropoda (2
species).
All the heavy metals concentrations were within the
permissible limits except iron concentrations at El-Qanater El-
Khiria, Helwan and Shobra due to the effect of discharged
industrial wastes. Arthropoda revealed the highest positive
correlation with iron and zinc concentrations in water and with
the concentrations of manganese, zinc, copper and cadmium in sediments. The principal component analysis (PCA) showed that
the most dominant annelid Limnodrilus spp. had a positive
correlation with cadmium and negative correlation with all other
heavy metals. This indicates that this species can resist the high
concentrations of cadmium.