Marian G . Nassif
Ain Shams, Zoology and Entomology, Faculty Member
This study focused on the monitoring and assessment of aquatic ecosystem functioning based on the abiotic and biotic features of Lake Nasser in the post-flood and pre-flood periods as the last ones before water storing behind the Grand... more
This study focused on the monitoring and assessment of aquatic ecosystem functioning based on the abiotic and biotic features of Lake Nasser in the post-flood and pre-flood periods as the last ones before water storing behind the Grand Ethiopian Renaissance Dam. The physicochemical parameters, distribution and structure of biotic communities, including bacteria, phytoplankton, zooplankton, macrophytes, epiphytes and fish were analyzed at 15 sites. The values of most parameters (primarily temperature, total suspended solids, pH, orthophosphates, carbonates, sulphates and some cations) were higher in the pre-flood period, whereas higher values of conductivity, total dissolved solids, total solids, nitrites, nitrates, chemical oxygen demand, bicarbonates and chlorophyll a were recorded in the post-flood period. Cyanobacteria-dominated phytoplankton and total coliform bacteria were more abundant in the pre-flood period, and especially at sites 10–15, whereas higher abundances of zooplan...
Research Interests:
This study was conducted to monitor the adverse effect of the drainage wastewater of three main factories on the macroinvertebrates biodiversity of Ismailia Canal. Water and benthos samples were collected seasonally during 2010 from 10... more
This study was conducted to monitor the adverse effect of the drainage wastewater of three main factories on the macroinvertebrates biodiversity of Ismailia Canal. Water and benthos samples were collected seasonally during 2010 from 10 stations along Ismailia Canal from El-Mezalat to Abu Zaabal city. The results revealed that most of the physico-chemical parameters were within the permissible limits, although, Cairo Power station and Abu Zaabal factory are causing partial pollution. The community of macrobenthic invertebrates was represented by Mollusca (35.20 %), Annelida (33.62 %) and Arthropoda (31.18 %). Limnodrilus hoffmeisteri and Chironomus larvae were dominating the whole studied area (32% and 28.51% of total macrobenthos, respectively) and they are considered to be potential bioindicators for polluted ecosystem. Low species diversity and occurrence of pollution-tolerant species (e.g. Limnodrilus hoffmeisteri and Chironomus larvae) indicate that the water quality of the canal is deteriorated. A regular program for biomonitoring is recommended which will allow future changes and enhancing in this important ecosystem.