الفهرس 
Phytoplankton
Physicochemical Propertiesيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Alexandria coastal ecosystems experience a high degree of progressive pressure from anthropogenic activities; over 183x106 m3 of untreated domestic sewage and wastewaters of different origins discharged annually into the sea via several outlets along the coast. The high anthropogenic stress in Alexandria coastal ecosystems creates numerous ecological challenges.Phytoplankton and seaweeds are the most important primary producers in coastal marine ecosystems,which competes each other for resources, showing extreme sensitivity and immediate reaction towards environmental forces and others as grazing and allopathic interactions. Yet,most of the previous phytoplankton studies in Alexandria coastal waters were restricted to hot spots of chronic eutrophication. Meanwhile, a complete database of macroalgal taxonomy, temporal and spatial distribution, and the environmental impacts on macroalgae dynamics seem obscure, and relatively sparse.The objectives are focused on; inter alia, the regional and temporal variations of phytoplankton and macroalgae assemblages, production, and quantification of environmental causes of variability. The applicability, utility and efficacy of phytoplankton and macroalgae for assessing water quality status in such temperate marine systems are among the major goals. The interaction between the two groups is determined experimentally through allelopathic activity. The need for such types of long-term monitoring is becoming increasingly important due to many threats facing natural communities. To achieve the purposes, three stations of different ecological entities,span for about 26 Km along the coastline were chosen; Abu Qir site at the east,Sidi Gaber in the middle and Qaitbey at the west. The selected sites assumed to be a slight polluted area, modest stressed area, and highly polluted area. The sampling stations operated for eight months between January and November 2013 (Twice per season). The measured environmental parameters include surface water temperature, salinity, dissolved oxygen, pH, and the analysis of the dissolved inorganic nutrients (NH4, NO3, NO2, PO4 and SiO4). Chlorophyll contents are measured as for biomass estimations and the wet-dry weights for macroalgae as well. Statistical analyses, eutrophication assessment, trophic and ecological indexes (Shannon‘s diversity index, evenness or equitability and Margalef richness index), as well as floristic composition value of macroalgae community were calculated