Eutrophication Problem in Egypt

Dorgham, Mohamed Moussa

doi:10.1007/978-90-481-9625-8_8

Cited by 15 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fouling community, including barnacles, bryozoans and high densities of serpulids such as S. triqueter observed at MX suggests that El-Mex Bay might experience more eutrophic conditions if compared to the other sampling sites. Eutrophic conditions were documented in El-Mex Bay (Dorgham, 2011). CAP indicated algae belonging to Corallina as related to both AQ and MN polychaete assemblages, while J. rubens and Hypnea musciformis particularly related to AQ, this being further away from El-Mex Bay.…”

Section: Discussionmentioning

confidence: 93%

Distribution patterns of shallow water polychaetes (Annelida) along the Alexandria coast, Egypt (eastern Mediterranean)

et al. 2014

View full text Add to dashboard Cite

Shallow hard bottom and intertidal soft bottom polychaete assemblages of the Alexandria coast, south-eastern Mediterranean (Levantine Sea), were studied during a complete annual cycle in order to analyze spatial temporal patterns of variation in assemblages, and relevant factors related to polychaete distribution. The present study recorded a total of 73 species, belonging to Syllidae (22 species), Nereididae (9 species), Serpulidae (6 species), Eunicidae (5 species) and another 19 families. The assemblages experienced pronounced spatial and temporal variation throughout the study area, but spatial variation appeared more important in determining the observed patterns. Polychaete distribution related to variation of grain size and sessile macrobenthos cover suggesting that these structural variables accounted more than the physical-chemical ones (namely BOD, dissolved oxygen, organic carbon, organic matter, salinity, temperature, pH) in influencing the patterns of assemblage distribution. A total of 9 alien polychaete species were found solely on hard substrata, of which Pseudonereis anomala and Linopherus canariensis formed dense population in the area. The present study is the south-eastern-most one dealing with the ecology and distribution patterns of hard bottom polychaetes from the Mediterranean Sea, as well as one of the few studies dealing with intertidal soft bottom polychaetes in the Levant Basin.

show abstract

Section: Discussionmentioning

confidence: 93%

Distribution patterns of shallow water polychaetes (Annelida) along the Alexandria coast, Egypt (eastern Mediterranean)

et al. 2014

View full text Add to dashboard Cite

show abstract

“…As regards the northern Mediterranean, the bays of the Ebro Delta and Albufera, Valencia (Spain) (Garcés & Camp, 2012), the coastal lagoons of south-eastern France (Collos et al, 2009), Kastela Bay (Croatia) (Ninčević Gladan et al, 2009), and Izmir Bay (Turkey) (Bizsel & Bizsel, 2002), are examples of environments where conditions were found stimulating excessive phytoplankton proliferation. Although not documented as extensively as for the northern Mediterranean, serious HAB incidents have also been reported in southern countries, such as in the coastal waters and lagoons of the Nile delta in Egypt (Dorgham, 2011), the coastal lagoons of Tunisia (Armi et al, 2010;Sahraoui et al, 2012) and Algeria (Frehi et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Driving factors of the potentially toxic and harmful species of Prorocentrum Ehrenberg in a semi-enclosed Mediterranean lagoon (Tunisia, SW Mediterranean)

Sahraoui¹,

Bouchouicha

Mabrouk

et al. 2013

Medit. Mar. Sci.

View full text Add to dashboard Cite

We analysed the dynamics of the potentially toxic and harmful species of Prorocentrum Ehrenberg in Bizerte Lagoon (important aquaculture area, Northern Tunisia), substantiating the possible driving forces (temperature, salinity and nutrients), based on a two-year database. We revealed that Prorocentrum spp. blooms of high magnitude (10 4 -10 5 cells l -1 ) occurred mostly during the period of late winter to early spring. We found five species of Prorocentrum, two of which, namely P. lima and P. cordatum, the most common during the field, are confirmed agents of Diarrhetic Shellfish Poisoning in various regions of the world. Prorocentrum sp., P. micans and P. gracile were however present only sporadically but with high cell abundances, exemplifying bloom densities. Canonical correspondence analysis revealed that P. minimum and P. lima were much more abundant in eutrophic waters characterized by high Chl a biomass, while P. gracile species occurred principally in warm waters. Furthermore, Prorocentrum sp. and P. micans seemed more likely to proliferate in saline waters with high concentrations of inorganic nutrients (nitrate, ammonia and phosphate). Our study calls attention to a possible intensification of DSP events in Bizerte Lagoon, given the propensity of Prorocentrum spp. to proliferate in a eutrophic system.

show abstract

“…Whereas, El-Mex Bay is considered as one of the most polluted coastal regions in the Mediterranean Sea. It has been continuously subjected to several severe pollution problems (Dorgham, 2011;Hendy, 2013). Furthermore, increase fishing effort, illegals fishing gear such as operation by the beach seine and the extensive fishing in the spawning grounds led to decline the annual commercial catch from the Egyptian Mediterranean waters (El-Karashily & Saleh, 1986).…”

Section: Discussionmentioning

confidence: 99%

Untitled

Bakhoum¹

2019

Turk. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

Assess the state of fish assemblies in surf zone of the Egyptian Mediterranean coast off Alexandria was carried out by determining community parameters such as abundance, diversity and impact of Immigrant fishes on species composition. Fish community in Beach area off Alexandria includes 22 families. Only 9 species dominated the catch representing 81.41% by number and 60.89% by weight. Immigrant fishes in beach area included 10 of 45 species, these migrant species representing about half of the community by number (47.07 %) and 38.34% by weight. The index of relative dominance (% IRD) revealed that Siganus rivulatus was dominated in Beach area contributing about 54.47% and it represent frist rank by number in all seasons. The results of biological indices lead us to consider fish community in summer more diverse than in others seasons. Relation between fullness index and numerical abundance of dominant fish species showed that, the Maximum values of both indices were found for S. rivulatus and Scomber japonicas in spring and for Stephanolepis hispidus in winter, while Pagellus erythrinus reavealed the maximum fullness index in autumn and and highst numerical abundance in winter. Significant positive correlation was found between abundances of Diplodus vulgaris and Pagellus erythrinus (r=0.98**), and between Sardinella aurita and Boops boops (r=0.99**), in contrary, Sardinella aurita revealed significant negative correlation with Stephanolepis hispidus (r=-0.89*). Ecological impacts of invasive alien species are decline in abundance of endemic species. The dominance of alien species can attributed to their ability to tolerate multiple anthropogenic stressors, in altering communities.

show abstract

Eutrophication Problem in Egypt

Cited by 15 publications

References 40 publications

Distribution patterns of shallow water polychaetes (Annelida) along the Alexandria coast, Egypt (eastern Mediterranean)

Distribution patterns of shallow water polychaetes (Annelida) along the Alexandria coast, Egypt (eastern Mediterranean)

Driving factors of the potentially toxic and harmful species of Prorocentrum Ehrenberg in a semi-enclosed Mediterranean lagoon (Tunisia, SW Mediterranean)

Untitled

Contact Info

Product

Resources

About