الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
Alam to a maximum of 89.59µM during autumn at El Quseer (south). The lowest
concentrations of total dissolved nitrogen (TDN) were recorded during spring at Marsa
Alam (5.89µM) and the highest concentrations were recorded during summer at Abo Gheson
(south) (59.52µM). Particulate nitrogen (PN) was fluctuated between a minimum of
0.31µM during autumn at Safaga (middle) to a maximum of 74.09µM during autumn at El
Quseer (south). Dissolved organic nitrogen (DON) recorded the minimum value of 0.30µM
during spring at both El Quseer (north) and Abo Gheson (south) and the maximum value of
48.82µM was recorded during summer at Abo Gheson (south). Reactive phosphate was
indicated that the spatial concentration of orthophosphate was depleted at mangrove stations
during the winter and during the autumn at middle Safaga and reached its maximum of
0.69µM at middle Abo Gheson during the summer. Total phosphorous (TP) recorded
minimum value of 0.33µM during winter at Abo Gheson (north) and maximum value of
5.83µM during autumn at Safaga (middle). Total dissolved phosphorus (TDP) showed a
minimum value of 0.13µM during spring at Safaga (north) and a maximum of 2.99µM during
summer at El Quseer (south). Particulate phosphorus (PP) concentration in water was
ranged from not detectible value during winter to 4.55µM during autumn at El Quseer
(middle). Dissolved organic phosphorus (DOP) concentration in the investigated study area
recorded a minimum value of 0.02µM during spring at Abo Gheson (middle) and a maximum
value of 2.67µM during summer at El Quseer (south). N/P ratio is usually above 19:1, this
explains the oligotrophic nature of the Red Sea. Reactive silicate (SiO4) concentration ranged
between a minimum of 0.56µM at middle Safaga during winter and a maximum of 6.60µM at
El Quseer (middle) during spring.