Productivity of the South Eastern Mediterranean

Dowidar, N. M.

doi:10.1007/978-94-009-1433-9_33

Cited by 20 publications

(15 citation statements)

References 12 publications

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“…Unfortunately, most of the Egyptian coastal zones along the Mediterranean Sea are subjected to intense discharges of pollutants from numerous anthropogenic activities (Dowidar, 1988). A high profile example is the region of El-Gamil coast at the northwestern part of Port Said City (Kaiser et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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El‐Serehy¹,

Aboulela²,

Al‐Misned³

et al. 2012

Turk. J. Fish. Aquat. Sci.

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The concentrations of Fe, Mn, Zn, Cu, Pb and Cd in bottom sediment and surface water in the Egyptian coastal waters along the Mediterranean Sea, and thence the soft tissues of the bivalve (Donax trunculus) were determined. The mean concentrations (µg g -1 ) of heavy metals in bottom sediment were as follows: Fe: 1748.2-2030, Mn: 191.4-254.3, Zn: 28-42.2, Cu: 4-9.4, Pb: 18.4-24.8, Cd: 1.4-2.3, and in surface water: Fe: 744-896, Mn: 162-198, Zn: 242.6-300, Cu: 12.6-19.3, Pb: 31.3-56, Cd: 0.8-3.1,while in soft tissues of the bivalve D. trunculus, the mean concentrations (µg g -1 dry weight) were as follows: Fe: 47.2-66.4, Mn: 4.8-8.4, Zn: 22-36.4, Cu: 3.2-4.8, Pb: 5.6-9.2, Cd: 1.6-2.4. The present study has revealed that the concentrations of Cd and Pb in the soft tissues of the edible bivalve D. trunculus were above the maximum acceptable concentrations for human consumption proposed by FAO/WHO, EU. Moreover, estimation of concentration factor (C f ) for the studied metals in the soft tissues of the edible bivalve D. trunculus recorded high accumulation rates of Cd and Cu. The present study confirmed that, the examined bivalve species was associated with enhanced metal content in its soft tissues and was not safe within the limits for human consumption. Water and bottom sediments showed apparent seasonal variations of metals accumulation with maximum concentrations during summer and winter, respectively. Mean metal concentrations were found to be higher in some of the selected five sites than others, but, these differences in heavy metal concentrations were not statistically significant (P>0.05), suggesting that common and main anthropogenic sources contributing to the heavy metal pollution at this Egyptian coastal area on the Mediterranean sea. The results obtained in this study were compared with those reported in earlier studies and concluded that, the area of the present study was in general not considered a metal polluted area according to the OME and EPA classification criteria. However, concentrations of Cd and especially, Pb did give some cause for concern, and warrants a continued monitoring programme for inorganic and chemical organic compounds in sediments, water, and biota along the Egyptian Mediterranean coasts.

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Section: Introductionmentioning

confidence: 99%

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El‐Serehy¹,

Aboulela²,

Al‐Misned³

et al. 2012

Turk. J. Fish. Aquat. Sci.

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“…This means that the fresh water discharge from Lake Manzalah to the Mediterranean coast may affect the plankton productivity in Sahl EL-Tinah. Dowidar (1988) attributed the reduction of zooplankton stock off the Nile Delta in the period from 1970 to 1985 to the heavy grazing by various planktivores. This explanation contradicts with the pattern of the variations of both sardine catch and zooplankton stock during that period, where the catch of sardine showed a gradual decrease during the period from 1979 to 1983 parallel to the similar decrease in zooplankton abundance during the same period.…”

Section: Resultsmentioning

confidence: 99%

“…During late winter, 14 species were recorded in the uppermost 50m, 9 species down to 100m and 6 species from 100-150m while 12 species appeared in different layers of the water column. From the vertical distribution of copepod species, it could be assumed that several species are considered as shade species, since they are mostly found at depths greater than 100m, while the depth of euphotic zone in the southeastern Mediterranean was reported to have a maximum of 70m in summer (Dowidar, 1988 Halim (1969) and Weikart (1980 and1987) But it is to be noted that the abundance of all the above mentioned species was mostly low relative to the population density of the total zooplankton in the whole area. Remarkably low abundance of zooplankton was found during the present study, whereas the autumn population density varied along the whole coast between 644 indiv./m 3 at Alamain and 1104 indiv./m 3 at Sahl El-Tina and the late winter population between 156 and 1316 indivVm 3 in the same sectors respectively.…”

Section: Resultsmentioning

confidence: 99%

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Zooplankton Community of the Egyptian Mediterranean Coast

Abdel-Aziz

Aboul-Ezz

2003

Egypt. J. of Aquatic Biolo. and Fish.

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“…In addition, pollutants resulting from industrial, sewage, agricultural discharges, many types of industrial wastes and urban runoff caused many problems for the human bodies. Furthermore, most of the present freshwater discharged into the coastal zones of Mediterranean Sea is of drainage water, which has been used for irrigation, often contaminated with sewage or industrial waste, which reached to the sea via the Delta lakes (Dowidar, 1988). The present study aims at to assess environmental status, develop and establish database required to monitor the main environmental problem along the Nile Delta ecosystem.…”

Section: Introductionmentioning

confidence: 99%