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  • Artikel  (5)
  • Sediments  (4)
  • Chemistry  (1)
  • United States
  • Alexandria: National Institute of Oceanography and Fisheries  (3)
  • Alexandria : National Oceanography and Fisheries  (1)
  • Ministerio de Educación Superior, Universidad de Oriente, Santiago de Cuba  (1)
  • 2005-2009  (5)
  • 1
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    Distribución de metales en sedimentos costeros del golfo de Guacanayabo (2007)
    Ministerio de Educación Superior, Universidad de Oriente, Santiago de Cuba
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Of great importance to our country economy in the coastal zone running along the Gulf of Guacanayabo because of the different species nurseries having commercial interest. Studies on Al, Pb, Zn, and Cu contents within the surface sediments along 210 km of coastal areas, where 42 stations were located are carried out in the work. Results obtained are used for distribution analysis of elements within the zone and their relationships with the domestic and industrial population groups.
    Beschreibung: Centro de Investigaciones Pesqueras (CIP)
    Beschreibung: Published
    Beschreibung: Al, Pb, Zn, Cu
    Schlagwort(e): Heavy metals ; Heavy metals ; Sediments ; Coastal zone
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Geochemical and environmental studies of recent marine sediments and some hard corals of Wadi El-Gemal area of the Red Sea, Egypt (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This Journal is published by National Institute of Oceanography and Fishereies, Alexandria, Egypt
    Beschreibung: The distribution of (Fe, Mn, Zn, Cu, Pb, Ni, Co and Cd) concentrations were determined in surface marine sediments and coral reefs at Wadi El-Gemal in the Red Sea area. There were significant differences in concentrations of heavy metals in the marine sediments relative to the coral reefs. Some heavy metal concentrations in sediments and coral reefs in the study area are high compared to that in the impact areas of the Egyptian Red Sea coast. The results indicate that the high concentrations of heavy metals in marine sediments and coral reefs are particularly affected by the high contribution of terrigenous materials through the stream of Wadi El-Gemal. Generally, heavy metals concentration in the sediments decreased with increasing distance from the shoreline with the exception of Pb, which increased with increasing distance from the shoreline. On the other hand, Pb concentration in coral reefs is high compared to that in some sediment samples at Wadi El- Gemal area. The grain size, carbonate, organic matter, phosphorus and heavy metals distribution reflect marked changes in lithology, biological activities in the sea and land geology of the study area. Carbonate content mainly of biogenic origin varies from 5.7 –69.5% of the sediments. Organic matter contents of the sediments (1.7 to 6.5%) and phosphorus content (110 to 5097ppm) usually reflect significant terrigenous influences. On the other hand, heavy metals show an increasing tendency in the mud fraction of Wadi El-Gemal area. The present work reflects how much the marine sediments and coral reefs are influenced by natural impacts from this wadi. The collected data will be useful in management and suitable development of the area, beside being helpful as database in the future.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Hard corals ; Wadi El-Gemal ; Natural impacts ; Heavy metals ; Environment ; Marine ecology ; Environments ; Marine ecology ; Marine pollution ; Sediments ; Coral reefs
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 1169765 bytes
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  • 3
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    Major controls of some metals distribution in sediments off the Nile Delta, Egypt. (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by NIOF, Alexandria, Egypt
    Beschreibung: The sediment samples that are collected during R/V CHAIN 1975 cruise to the southeastern Mediterranean have been used to determine the major controls of metals’distribution. The sediment samples were analysed mineralogically, chemically and texturally. The parameters measured included carbonate minerals, total carbonate, organic carbon, iron, manganese, copper, zinc, chromium, lead, nickel, cobalt, vanadium, calcium, magnesium, strontium, sand, silt and clay. The statistical analysis of data showed that four major factors control the distribution of metals in sediments of the Nile cone; These are: Factor 1 terrigenous mud-calcareous sand; Factor 2 Aragonite mud-terrigenous sand; Factor 3 Algal sand; and Factor 4 Aragonite. The percentages of terrigenous sand, mud and calcareous components of the Nile cone sediments greatly affect the elements spatial distribution. In addition to that, minor controls such as precipitation and coprecipitation may affect the elemental distribution. The distributions of iron, manganese, copper, zinc, chromium, lead, nickel, cobalt, and vanadium are associated mainly with the terrigenous mud fraction of the sediment whereas, calcium and strontium are mainly related to calcareous sands. Iron, copper, cobalt, lead and vanadium are partially related to montmorillonite. Lead is associated with acid feldspars and chromium is mainly controlled by terrigenous sand. The distribution of calcium and strontium is controlled by the coarsecalcareous fraction of sediments. Magnesium and manganese are associate with algal sand. The aragonite and calcite minerals are forming the majority of carbonate mud, which controls partially the distribution of calcium, strontium, lead and copper.
    Beschreibung: NIOF, Alexandria, Egypt
    Beschreibung: Published
    Schlagwort(e): Metals ; Factor analysis ; Coastal oceanography ; Sediments
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 40131 bytes
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  • 4
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    Some ecological factors affecting coral reef assemblages off Hurghada, Red Sea, Egypt (2006)
    Alexandria : National Oceanography and Fisheries
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by NIOF, Alexandria, Egypt
    Beschreibung: Three shallow reef sites were investigated during four seasons Autumn, 2003, Winter, Spring and Summer, 2004) off the Marine Biological Station at Hurghada, Red Sea, Egypt. Thirty-eight scleractinian coral species were recorded at the studied sites. Generally, Twenty-six species were affected by more than one factor (such as high temperature, solar radiation, sedimentation and algae), while the last twelve species remained healthy. The affected species (26 species) were divided into the following: five species were affected by combination of high temperature and direct exposure to solar radiation during the neap tide, eleven species only were affected by sedimentation and increasing algal cover and ten species were affected by high temperature, solar radiation, sedimentation and algae all together. Coral bleaching and death in some cases were due to these factors. Galaxea fascicularis, Seriatopora hystrix and Millepora dichotoma were partially bleached but recovered during the high tide time within weeks. Few species such as Acropora granulosa, Montipora venosa, Goniastrea pectinata and Porites solida were completely bleached and could not recover but died. Repeated leaching events in the future may expose corals to an increasingly hostile environment.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Algal cover ; Solar radiation ; Sea level ; Sedimentation ; Red Sea ; Sediments ; Coral reefs ; Ecology
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 45810 bytes
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  • 5
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    Ecological and fisheries development of Lake Manzalah (Egypt): hydrography and chemistry of Lake Manzalah (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by the NIOF, Egypt
    Beschreibung: Lake Manzalah; the largest delta Lake in Egypt represents a dynamic system that has been undergoing continuous and pronounced changes since long times. In the last year’s this Lake faced drastic problems that retarded its environmental and fisheries development; the most serious one is the discharge of waste water. It is attempted in the present study to investigate the chemical characters of Lake Manzalah water during 2001-2002. Water temperature ranged from an average of 12.35oC in January and 29.14oC in July. Dissolved Oxygen, pH and total dissolved solids were found in ranges optimum for the living of marine and freshwater fish species. The average concentrations of nutrients lied in the following ranges: 1.24 to 4.89 μmol PO4 -3 l-1 , 5.08 to 28.73 μmol SiO4 -2 l-1 and 1.81 to 17.7 μ_mol NO3-1 l-1 The concentrations of phosphorus and nitrogen compounds were found to be relatively higher at the southern regions of the Lake near to the outlets of the drains.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Hydrography ; Water ; Chemistry ; Chemical composition ; Water content ; Environment ; Chemical composition ; Environments ; Water content ; Fisheries
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 1623488 bytes
    Format: 46916 bytes
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