scholarly journals STUDIES ON THE EFFECT OF EL RAHAWAY DRAIN ON THE RIVER NILE WATER POLLUTION BY TRACE METALS AND MAJOR CATIONS AT EL-KANATER-EL KHYRIA AREA UNDER THE EFFECT OF SEASONAL VARIATION تعييـن بعض العناصر الثقيلة والکاتيونات الرئيسة في مياه نهر النيل تحت تأثير التغير الفصلي في منطقة مصرف الرهاوي/القناطر الخيرية

2006 ◽  
Vol 9.2 (9.2) ◽  
pp. 35-53
Keyword(s):  
Water Pollution ◽  
Seasonal Variation ◽  
Trace Metals ◽  
River Nile ◽  
Major Cations ◽  
Nile Water

Cationic Starch and Polyaluminum Chloride as Coagulants for River Nile Water Treatment

2020 ◽  
Vol 10 ◽  
pp. 100331 ◽  
Author(s):  
Sayeda M. Abdo ◽  
Rehab H. Mahmoud ◽  
Marwa Youssef ◽  
Mehrez E. El-Naggar
Keyword(s):  
Water Treatment ◽  
River Nile ◽  
Cationic Starch ◽  
Polyaluminum Chloride ◽  
Nile Water

scholarly journals Damsels in distress – seasons, habitat structure and water pollution changes damselfly diversity and assemblage in urban wetlands

2016 ◽  
Vol 66 (3-4) ◽  
pp. 305-319 ◽  
Author(s):  
Pankaj Koparde
Keyword(s):  
Water Pollution ◽  
Seasonal Variation ◽  
Multiple Regression ◽  
Habitat Restoration ◽  
Biological Assessment ◽  
Species Number ◽  
Urban Green Spaces ◽  
Combining Data ◽  
The City

Odonates are considered to be good ecological indicators, hence, they are used in biological assessment of habitat quality. However, species responses may vary spatiotemporally and therefore, it is useful to establish species-habitat relationships at a regional level. To test if tropical urban odonates respond to seasons, and to explore species-habitat relationships with an emphasis on water pollution, I studied six wetlands in the city of Pune for a year. I also investigated whether combining data on dragonflies and damselflies, as is often done in many studies, skews the results. I recorded seasons, water pollution and habitat attributes as predictors of the odonate diversity and assemblage. I analyzed the data on dragonflies, damselflies and odonates (dragonfly-damselfly combined) separately for seasonal variation, and species-habitat relationships. I used multiple regression and canonical correspondence analyses. Forty-four species were recorded during the study. No seasonal variation was detected, except for damselflies, which showed an increase in the diversity and species number post-monsoon. Multiple regression analysis showed that damselfly and dragonfly diversity varied as a function of season and water pollution, and monsoon respectively. In pre-monsoon, damselfly diversity marginally increased with pollution. Both the analyses suggest that combining data on dragonflies and damselflies may skew the end results. Therefore, I recommend further intensive and long-term research using accurately sampled habitat and pollution attributes, as well as habitat restoration through conserving urban green spaces and promoting gardens with streams and ponds.

The Seasonal Variation of the Free and Combined Dissolved Amino Acids in the Irish Sea

1970 ◽  
Vol 50 (3) ◽  
pp. 713-720 ◽  
Author(s):  
J. P. Riley ◽  
D. A. Segar
Keyword(s):  
Amino Acids ◽  
Seasonal Variation ◽  
Trace Metals ◽  
Marine Invertebrates ◽  
Marine Organisms ◽  
Free State ◽  
Irish Sea ◽  
The Irish Sea

Dissolved amino acids, in both the free state and combined as polypeptides, play an important part in the marine biochemistry of nitrogen. These compounds are excreted by phytoplankton (Fogg, 1962, 1966; Stewart, 1963; Hellebust, 1965) and zooplankton (Johannes & Webb, 1965; Webb & Johannes, 1965) and are utilized by algae (Syrett, 1962), bacteria (Proom & Woiwood, 1949) and marine invertebrates (Stephens & Schinske, 1961). Experiments with cultures have shown, indeed, that some species of phyto-plankton will not grow, or grow only with difficulty, if certain amino acids are absent (Harvey, 1938; Provasoli & Gold, 1957; Droop, 1957, 1959, 1962). In addition to their direct biochemical role, amino acids may also serve to complex trace metals, such as copper and iron, and keep them readily available for assimilation by marine organisms (Harvey, 1938; Fogg, 1959; Provasoli, 1963; Kent & Hooper, 1965; Saunders, 1957).

scholarly journals Seasonal variation of heavy metals in water and organs of Oreochromis niloticus at Rosetta Branch, River Nile, Egypt.

2019 ◽  
Vol 23 (3) ◽  
pp. 513-526
Author(s):  
Marwa M. Darweesh ◽  
Hala M. Gamal El-Dein ◽  
Samir M. Abou-Shleel ◽  
Mohammed A. El-Shirbeny
Keyword(s):  
Heavy Metals ◽  
Seasonal Variation ◽  
Oreochromis Niloticus ◽  
River Nile
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